mirror of
https://github.com/ZDoom/gzdoom-gles.git
synced 2024-12-17 07:41:40 +00:00
1055 lines
34 KiB
C++
1055 lines
34 KiB
C++
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/*
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** Triangle drawers
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** Copyright (c) 2016 Magnus Norddahl
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**
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** This software is provided 'as-is', without any express or implied
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** warranty. In no event will the authors be held liable for any damages
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** arising from the use of this software.
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**
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** Permission is granted to anyone to use this software for any purpose,
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** including commercial applications, and to alter it and redistribute it
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** freely, subject to the following restrictions:
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**
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** 1. The origin of this software must not be misrepresented; you must not
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** claim that you wrote the original software. If you use this software
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** in a product, an acknowledgment in the product documentation would be
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** appreciated but is not required.
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** 2. Altered source versions must be plainly marked as such, and must not be
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** misrepresented as being the original software.
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** 3. This notice may not be removed or altered from any source distribution.
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**
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*/
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#include <stddef.h>
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#include "templates.h"
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#include "doomdef.h"
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#include "i_system.h"
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#include "w_wad.h"
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#include "r_local.h"
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#include "v_video.h"
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#include "doomstat.h"
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#include "st_stuff.h"
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#include "g_game.h"
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#include "g_level.h"
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#include "r_data/r_translate.h"
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#include "v_palette.h"
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#include "r_data/colormaps.h"
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#include "r_poly_triangle.h"
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void PolyTriangleDrawer::draw(const TriMatrix &objectToClip, const TriVertex *vinput, int vcount, TriangleDrawMode mode, bool ccw, int clipleft, int clipright, int cliptop, int clipbottom, FTexture *texture)
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{
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if (r_swtruecolor)
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queue_arrays(objectToClip, vinput, vcount, mode, ccw, clipleft, clipright, cliptop, clipbottom, (const uint8_t*)texture->GetPixelsBgra(), texture->GetWidth(), texture->GetHeight(), 0);
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else
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draw_arrays(objectToClip, vinput, vcount, mode, ccw, clipleft, clipright, cliptop, clipbottom, texture->GetPixels(), texture->GetWidth(), texture->GetHeight(), 0, nullptr, &ScreenPolyTriangleDrawer::draw);
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}
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void PolyTriangleDrawer::fill(const TriMatrix &objectToClip, const TriVertex *vinput, int vcount, TriangleDrawMode mode, bool ccw, int clipleft, int clipright, int cliptop, int clipbottom, int solidcolor)
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{
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if (r_swtruecolor)
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queue_arrays(objectToClip, vinput, vcount, mode, ccw, clipleft, clipright, cliptop, clipbottom, nullptr, 0, 0, solidcolor);
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else
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draw_arrays(objectToClip, vinput, vcount, mode, ccw, clipleft, clipright, cliptop, clipbottom, nullptr, 0, 0, solidcolor, nullptr, &ScreenPolyTriangleDrawer::fill);
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}
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void PolyTriangleDrawer::queue_arrays(const TriMatrix &objectToClip, const TriVertex *vinput, int vcount, TriangleDrawMode mode, bool ccw, int clipleft, int clipright, int cliptop, int clipbottom, const uint8_t *texturePixels, int textureWidth, int textureHeight, int solidcolor)
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{
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if (clipright < clipleft || clipleft < 0 || clipright > MAXWIDTH || clipbottom < cliptop || cliptop < 0 || clipbottom > MAXHEIGHT)
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return;
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DrawerCommandQueue::QueueCommand<DrawPolyTrianglesCommand>(objectToClip, vinput, vcount, mode, ccw, clipleft, clipright, cliptop, clipbottom, texturePixels, textureWidth, textureHeight, solidcolor);
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}
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void PolyTriangleDrawer::draw_arrays(const TriMatrix &objectToClip, const TriVertex *vinput, int vcount, TriangleDrawMode mode, bool ccw, int clipleft, int clipright, int cliptop, int clipbottom, const uint8_t *texturePixels, int textureWidth, int textureHeight, int solidcolor, DrawerThread *thread, void(*drawfunc)(const ScreenPolyTriangleDrawerArgs *, DrawerThread *))
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{
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if (vcount < 3)
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return;
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ScreenPolyTriangleDrawerArgs args;
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args.dest = dc_destorg;
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args.pitch = dc_pitch;
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args.clipleft = clipleft;
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args.clipright = clipright;
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args.cliptop = cliptop;
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args.clipbottom = clipbottom;
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args.texturePixels = texturePixels;
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args.textureWidth = textureWidth;
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args.textureHeight = textureHeight;
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args.solidcolor = solidcolor;
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TriVertex vert[3];
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if (mode == TriangleDrawMode::Normal)
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{
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for (int i = 0; i < vcount / 3; i++)
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{
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for (int j = 0; j < 3; j++)
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vert[j] = shade_vertex(objectToClip, *(vinput++));
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draw_shaded_triangle(vert, ccw, &args, thread, drawfunc);
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}
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}
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else if (mode == TriangleDrawMode::Fan)
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{
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vert[0] = shade_vertex(objectToClip, *(vinput++));
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vert[1] = shade_vertex(objectToClip, *(vinput++));
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for (int i = 2; i < vcount; i++)
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{
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vert[2] = shade_vertex(objectToClip, *(vinput++));
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draw_shaded_triangle(vert, ccw, &args, thread, drawfunc);
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vert[1] = vert[2];
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}
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}
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else // TriangleDrawMode::Strip
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{
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vert[0] = shade_vertex(objectToClip, *(vinput++));
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vert[1] = shade_vertex(objectToClip, *(vinput++));
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for (int i = 2; i < vcount; i++)
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{
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vert[2] = shade_vertex(objectToClip, *(vinput++));
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draw_shaded_triangle(vert, ccw, &args, thread, drawfunc);
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vert[0] = vert[1];
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vert[1] = vert[2];
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ccw = !ccw;
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}
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}
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}
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TriVertex PolyTriangleDrawer::shade_vertex(const TriMatrix &objectToClip, TriVertex v)
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{
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// Apply transform to get clip coordinates:
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return objectToClip * v;
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}
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void PolyTriangleDrawer::draw_shaded_triangle(const TriVertex *vert, bool ccw, ScreenPolyTriangleDrawerArgs *args, DrawerThread *thread, void(*drawfunc)(const ScreenPolyTriangleDrawerArgs *, DrawerThread *))
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{
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// Cull, clip and generate additional vertices as needed
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TriVertex clippedvert[6];
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int numclipvert = 0;
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clipedge(vert[0], vert[1], clippedvert, numclipvert);
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clipedge(vert[1], vert[2], clippedvert, numclipvert);
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clipedge(vert[2], vert[0], clippedvert, numclipvert);
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// Map to 2D viewport:
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for (int j = 0; j < numclipvert; j++)
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{
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auto &v = clippedvert[j];
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// Calculate normalized device coordinates:
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v.w = 1.0f / v.w;
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v.x *= v.w;
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v.y *= v.w;
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v.z *= v.w;
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// Apply viewport scale to get screen coordinates:
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v.x = viewwidth * (1.0f + v.x) * 0.5f;
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v.y = viewheight * (1.0f - v.y) * 0.5f;
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}
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// Draw screen triangles
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if (ccw)
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{
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for (int i = numclipvert; i > 1; i--)
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{
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args->v1 = &clippedvert[numclipvert - 1];
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args->v2 = &clippedvert[i - 1];
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args->v3 = &clippedvert[i - 2];
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drawfunc(args, thread);
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}
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}
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else
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{
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for (int i = 2; i < numclipvert; i++)
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{
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args->v1 = &clippedvert[0];
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args->v2 = &clippedvert[i - 1];
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args->v3 = &clippedvert[i];
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drawfunc(args, thread);
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}
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}
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}
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bool PolyTriangleDrawer::cullhalfspace(float clipdistance1, float clipdistance2, float &t1, float &t2)
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{
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float d1 = clipdistance1 * (1.0f - t1) + clipdistance2 * t1;
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float d2 = clipdistance1 * (1.0f - t2) + clipdistance2 * t2;
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if (d1 < 0.0f && d2 < 0.0f)
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return true;
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if (d1 < 0.0f)
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t1 = MAX(-clipdistance1 / (clipdistance2 - clipdistance1), t1);
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if (d2 < 0.0f)
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t2 = MIN(1.0f + clipdistance2 / (clipdistance1 - clipdistance2), t2);
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return false;
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}
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void PolyTriangleDrawer::clipedge(const TriVertex &v1, const TriVertex &v2, TriVertex *clippedvert, int &numclipvert)
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{
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// Clip and cull so that the following is true for all vertices:
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// -v.w <= v.x <= v.w
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// -v.w <= v.y <= v.w
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// -v.w <= v.z <= v.w
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float t1 = 0.0f, t2 = 1.0f;
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bool culled =
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cullhalfspace(v1.x + v1.w, v2.x + v2.w, t1, t2) ||
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cullhalfspace(v1.w - v1.x, v2.w - v2.x, t1, t2) ||
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cullhalfspace(v1.y + v1.w, v2.y + v2.w, t1, t2) ||
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cullhalfspace(v1.w - v1.y, v2.w - v2.y, t1, t2) ||
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cullhalfspace(v1.z + v1.w, v2.z + v2.w, t1, t2) ||
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cullhalfspace(v1.w - v1.z, v2.w - v2.z, t1, t2);
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if (culled)
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return;
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if (t1 == 0.0f)
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{
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clippedvert[numclipvert++] = v1;
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}
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else
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{
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auto &v = clippedvert[numclipvert++];
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v.x = v1.x * (1.0f - t1) + v2.x * t1;
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v.y = v1.y * (1.0f - t1) + v2.y * t1;
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v.z = v1.z * (1.0f - t1) + v2.z * t1;
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v.w = v1.w * (1.0f - t1) + v2.w * t1;
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for (int i = 0; i < TriVertex::NumVarying; i++)
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v.varying[i] = v1.varying[i] * (1.0f - t1) + v2.varying[i] * t1;
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}
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if (t2 != 1.0f)
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{
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auto &v = clippedvert[numclipvert++];
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v.x = v1.x * (1.0f - t2) + v2.x * t2;
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v.y = v1.y * (1.0f - t2) + v2.y * t2;
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v.z = v1.z * (1.0f - t2) + v2.z * t2;
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v.w = v1.w * (1.0f - t2) + v2.w * t2;
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for (int i = 0; i < TriVertex::NumVarying; i++)
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v.varying[i] = v1.varying[i] * (1.0f - t2) + v2.varying[i] * t2;
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}
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}
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/////////////////////////////////////////////////////////////////////////////
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void ScreenPolyTriangleDrawer::draw(const ScreenPolyTriangleDrawerArgs *args, DrawerThread *thread)
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{
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uint8_t *dest = args->dest;
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int pitch = args->pitch;
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const TriVertex &v1 = *args->v1;
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const TriVertex &v2 = *args->v2;
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const TriVertex &v3 = *args->v3;
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int clipleft = args->clipleft;
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int clipright = args->clipright;
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int cliptop = args->cliptop;
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int clipbottom = args->clipbottom;
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const uint8_t *texturePixels = args->texturePixels;
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int textureWidth = args->textureWidth;
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int textureHeight = args->textureHeight;
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// 28.4 fixed-point coordinates
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const int Y1 = (int)round(16.0f * v1.y);
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const int Y2 = (int)round(16.0f * v2.y);
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const int Y3 = (int)round(16.0f * v3.y);
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const int X1 = (int)round(16.0f * v1.x);
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const int X2 = (int)round(16.0f * v2.x);
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const int X3 = (int)round(16.0f * v3.x);
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// Deltas
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const int DX12 = X1 - X2;
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const int DX23 = X2 - X3;
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const int DX31 = X3 - X1;
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const int DY12 = Y1 - Y2;
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const int DY23 = Y2 - Y3;
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const int DY31 = Y3 - Y1;
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// Fixed-point deltas
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const int FDX12 = DX12 << 4;
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const int FDX23 = DX23 << 4;
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const int FDX31 = DX31 << 4;
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const int FDY12 = DY12 << 4;
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const int FDY23 = DY23 << 4;
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const int FDY31 = DY31 << 4;
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// Bounding rectangle
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int minx = MAX((MIN(MIN(X1, X2), X3) + 0xF) >> 4, clipleft);
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int maxx = MIN((MAX(MAX(X1, X2), X3) + 0xF) >> 4, clipright - 1);
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int miny = MAX((MIN(MIN(Y1, Y2), Y3) + 0xF) >> 4, cliptop);
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int maxy = MIN((MAX(MAX(Y1, Y2), Y3) + 0xF) >> 4, clipbottom - 1);
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if (minx >= maxx || miny >= maxy)
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return;
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// Block size, standard 8x8 (must be power of two)
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const int q = 8;
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// Start in corner of 8x8 block
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minx &= ~(q - 1);
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miny &= ~(q - 1);
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dest += miny * pitch;
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// Half-edge constants
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int C1 = DY12 * X1 - DX12 * Y1;
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int C2 = DY23 * X2 - DX23 * Y2;
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int C3 = DY31 * X3 - DX31 * Y3;
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// Correct for fill convention
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if (DY12 < 0 || (DY12 == 0 && DX12 > 0)) C1++;
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if (DY23 < 0 || (DY23 == 0 && DX23 > 0)) C2++;
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if (DY31 < 0 || (DY31 == 0 && DX31 > 0)) C3++;
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// Gradients
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float gradWX = gradx(v1.x, v1.y, v2.x, v2.y, v3.x, v3.y, v1.w, v2.w, v3.w);
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float gradWY = grady(v1.x, v1.y, v2.x, v2.y, v3.x, v3.y, v1.w, v2.w, v3.w);
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float startW = v1.w + gradWX * (minx - v1.x) + gradWY * (miny - v1.y);
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float gradVaryingX[TriVertex::NumVarying], gradVaryingY[TriVertex::NumVarying], startVarying[TriVertex::NumVarying];
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for (int i = 0; i < TriVertex::NumVarying; i++)
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{
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gradVaryingX[i] = gradx(v1.x, v1.y, v2.x, v2.y, v3.x, v3.y, v1.varying[i] * v1.w, v2.varying[i] * v2.w, v3.varying[i] * v3.w);
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|
|
gradVaryingY[i] = grady(v1.x, v1.y, v2.x, v2.y, v3.x, v3.y, v1.varying[i] * v1.w, v2.varying[i] * v2.w, v3.varying[i] * v3.w);
|
||
|
|
startVarying[i] = v1.varying[i] * v1.w + gradVaryingX[i] * (minx - v1.x) + gradVaryingY[i] * (miny - v1.y);
|
||
|
|
}
|
||
|
|
|
||
|
|
// Loop through blocks
|
||
|
|
for (int y = miny; y < maxy; y += q, dest += q * pitch)
|
||
|
|
{
|
||
|
|
// Is this row of blocks done by this thread?
|
||
|
|
if (thread->skipped_by_thread(y / q)) continue;
|
||
|
|
|
||
|
|
for (int x = minx; x < maxx; x += q)
|
||
|
|
{
|
||
|
|
// Corners of block
|
||
|
|
int x0 = x << 4;
|
||
|
|
int x1 = (x + q - 1) << 4;
|
||
|
|
int y0 = y << 4;
|
||
|
|
int y1 = (y + q - 1) << 4;
|
||
|
|
|
||
|
|
// Evaluate half-space functions
|
||
|
|
bool a00 = C1 + DX12 * y0 - DY12 * x0 > 0;
|
||
|
|
bool a10 = C1 + DX12 * y0 - DY12 * x1 > 0;
|
||
|
|
bool a01 = C1 + DX12 * y1 - DY12 * x0 > 0;
|
||
|
|
bool a11 = C1 + DX12 * y1 - DY12 * x1 > 0;
|
||
|
|
int a = (a00 << 0) | (a10 << 1) | (a01 << 2) | (a11 << 3);
|
||
|
|
|
||
|
|
bool b00 = C2 + DX23 * y0 - DY23 * x0 > 0;
|
||
|
|
bool b10 = C2 + DX23 * y0 - DY23 * x1 > 0;
|
||
|
|
bool b01 = C2 + DX23 * y1 - DY23 * x0 > 0;
|
||
|
|
bool b11 = C2 + DX23 * y1 - DY23 * x1 > 0;
|
||
|
|
int b = (b00 << 0) | (b10 << 1) | (b01 << 2) | (b11 << 3);
|
||
|
|
|
||
|
|
bool c00 = C3 + DX31 * y0 - DY31 * x0 > 0;
|
||
|
|
bool c10 = C3 + DX31 * y0 - DY31 * x1 > 0;
|
||
|
|
bool c01 = C3 + DX31 * y1 - DY31 * x0 > 0;
|
||
|
|
bool c11 = C3 + DX31 * y1 - DY31 * x1 > 0;
|
||
|
|
int c = (c00 << 0) | (c10 << 1) | (c01 << 2) | (c11 << 3);
|
||
|
|
|
||
|
|
// Skip block when outside an edge
|
||
|
|
if (a == 0x0 || b == 0x0 || c == 0x0) continue;
|
||
|
|
|
||
|
|
// Check if block needs clipping
|
||
|
|
bool clipneeded = clipleft > x || clipright < (x + q) || cliptop > y || clipbottom < (y + q);
|
||
|
|
|
||
|
|
// Calculate varying variables for affine block
|
||
|
|
float offx0 = (x - minx) + 0.5f;
|
||
|
|
float offy0 = (y - miny) + 0.5f;
|
||
|
|
float offx1 = offx0 + q;
|
||
|
|
float offy1 = offy0 + q;
|
||
|
|
float rcpWTL = 1.0f / (startW + offx0 * gradWX + offy0 * gradWY);
|
||
|
|
float rcpWTR = 1.0f / (startW + offx1 * gradWX + offy0 * gradWY);
|
||
|
|
float rcpWBL = 1.0f / (startW + offx0 * gradWX + offy1 * gradWY);
|
||
|
|
float rcpWBR = 1.0f / (startW + offx1 * gradWX + offy1 * gradWY);
|
||
|
|
float varyingTL[TriVertex::NumVarying];
|
||
|
|
float varyingTR[TriVertex::NumVarying];
|
||
|
|
float varyingBL[TriVertex::NumVarying];
|
||
|
|
float varyingBR[TriVertex::NumVarying];
|
||
|
|
for (int i = 0; i < TriVertex::NumVarying; i++)
|
||
|
|
{
|
||
|
|
varyingTL[i] = (startVarying[i] + offx0 * gradVaryingX[i] + offy0 * gradVaryingY[i]) * rcpWTL;
|
||
|
|
varyingTR[i] = (startVarying[i] + offx1 * gradVaryingX[i] + offy0 * gradVaryingY[i]) * rcpWTR;
|
||
|
|
varyingBL[i] = ((startVarying[i] + offx0 * gradVaryingX[i] + offy1 * gradVaryingY[i]) * rcpWBL - varyingTL[i]) * (1.0f / q);
|
||
|
|
varyingBR[i] = ((startVarying[i] + offx1 * gradVaryingX[i] + offy1 * gradVaryingY[i]) * rcpWBR - varyingTR[i]) * (1.0f / q);
|
||
|
|
}
|
||
|
|
|
||
|
|
uint8_t *buffer = dest;
|
||
|
|
|
||
|
|
// Accept whole block when totally covered
|
||
|
|
if (a == 0xF && b == 0xF && c == 0xF && !clipneeded)
|
||
|
|
{
|
||
|
|
for (int iy = 0; iy < q; iy++)
|
||
|
|
{
|
||
|
|
float varying[TriVertex::NumVarying], varyingStep[TriVertex::NumVarying];
|
||
|
|
for (int i = 0; i < TriVertex::NumVarying; i++)
|
||
|
|
{
|
||
|
|
varying[i] = varyingTL[i] + varyingBL[i] * iy;
|
||
|
|
varyingStep[i] = (varyingTR[i] + varyingBR[i] * iy - varying[i]) * (1.0f / q);
|
||
|
|
}
|
||
|
|
|
||
|
|
for (int ix = x; ix < x + q; ix++)
|
||
|
|
{
|
||
|
|
uint32_t ufrac = (uint32_t)((varying[0] - floor(varying[0])) * 0x100000000LL);
|
||
|
|
uint32_t vfrac = (uint32_t)((varying[1] - floor(varying[1])) * 0x100000000LL);
|
||
|
|
//uint32_t light = (uint32_t)clamp(varying[2] * 255.0f + 0.5f, 0.0f, 255.0f);
|
||
|
|
|
||
|
|
uint32_t upos = ((ufrac >> 16) * textureWidth) >> 16;
|
||
|
|
uint32_t vpos = ((vfrac >> 16) * textureHeight) >> 16;
|
||
|
|
uint32_t uvoffset = upos * textureHeight + vpos;
|
||
|
|
|
||
|
|
buffer[ix] = texturePixels[uvoffset];
|
||
|
|
|
||
|
|
for (int i = 0; i < TriVertex::NumVarying; i++)
|
||
|
|
varying[i] += varyingStep[i];
|
||
|
|
}
|
||
|
|
|
||
|
|
buffer += pitch;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else // Partially covered block
|
||
|
|
{
|
||
|
|
int CY1 = C1 + DX12 * y0 - DY12 * x0;
|
||
|
|
int CY2 = C2 + DX23 * y0 - DY23 * x0;
|
||
|
|
int CY3 = C3 + DX31 * y0 - DY31 * x0;
|
||
|
|
|
||
|
|
for (int iy = 0; iy < q; iy++)
|
||
|
|
{
|
||
|
|
int CX1 = CY1;
|
||
|
|
int CX2 = CY2;
|
||
|
|
int CX3 = CY3;
|
||
|
|
|
||
|
|
float varying[TriVertex::NumVarying], varyingStep[TriVertex::NumVarying];
|
||
|
|
for (int i = 0; i < TriVertex::NumVarying; i++)
|
||
|
|
{
|
||
|
|
varying[i] = varyingTL[i] + varyingBL[i] * iy;
|
||
|
|
varyingStep[i] = (varyingTR[i] + varyingBR[i] * iy - varying[i]) * (1.0f / q);
|
||
|
|
}
|
||
|
|
|
||
|
|
for (int ix = x; ix < x + q; ix++)
|
||
|
|
{
|
||
|
|
bool visible = ix >= clipleft && ix <= clipright && (cliptop <= y + iy) && (clipbottom > y + iy);
|
||
|
|
|
||
|
|
if (CX1 > 0 && CX2 > 0 && CX3 > 0 && visible)
|
||
|
|
{
|
||
|
|
uint32_t ufrac = (uint32_t)((varying[0] - floor(varying[0])) * 0x100000000LL);
|
||
|
|
uint32_t vfrac = (uint32_t)((varying[1] - floor(varying[1])) * 0x100000000LL);
|
||
|
|
//uint32_t light = (uint32_t)clamp(varying[2] * 255.0f + 0.5f, 0.0f, 255.0f);
|
||
|
|
|
||
|
|
uint32_t upos = ((ufrac >> 16) * textureWidth) >> 16;
|
||
|
|
uint32_t vpos = ((vfrac >> 16) * textureHeight) >> 16;
|
||
|
|
uint32_t uvoffset = upos * textureHeight + vpos;
|
||
|
|
|
||
|
|
buffer[ix] = texturePixels[uvoffset];
|
||
|
|
}
|
||
|
|
|
||
|
|
for (int i = 0; i < TriVertex::NumVarying; i++)
|
||
|
|
varying[i] += varyingStep[i];
|
||
|
|
|
||
|
|
CX1 -= FDY12;
|
||
|
|
CX2 -= FDY23;
|
||
|
|
CX3 -= FDY31;
|
||
|
|
}
|
||
|
|
|
||
|
|
CY1 += FDX12;
|
||
|
|
CY2 += FDX23;
|
||
|
|
CY3 += FDX31;
|
||
|
|
|
||
|
|
buffer += pitch;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void ScreenPolyTriangleDrawer::fill(const ScreenPolyTriangleDrawerArgs *args, DrawerThread *thread)
|
||
|
|
{
|
||
|
|
uint8_t *dest = args->dest;
|
||
|
|
int pitch = args->pitch;
|
||
|
|
const TriVertex &v1 = *args->v1;
|
||
|
|
const TriVertex &v2 = *args->v2;
|
||
|
|
const TriVertex &v3 = *args->v3;
|
||
|
|
int clipleft = args->clipleft;
|
||
|
|
int clipright = args->clipright;
|
||
|
|
int cliptop = args->cliptop;
|
||
|
|
int clipbottom = args->clipbottom;
|
||
|
|
int solidcolor = args->solidcolor;
|
||
|
|
|
||
|
|
// 28.4 fixed-point coordinates
|
||
|
|
const int Y1 = (int)round(16.0f * v1.y);
|
||
|
|
const int Y2 = (int)round(16.0f * v2.y);
|
||
|
|
const int Y3 = (int)round(16.0f * v3.y);
|
||
|
|
|
||
|
|
const int X1 = (int)round(16.0f * v1.x);
|
||
|
|
const int X2 = (int)round(16.0f * v2.x);
|
||
|
|
const int X3 = (int)round(16.0f * v3.x);
|
||
|
|
|
||
|
|
// Deltas
|
||
|
|
const int DX12 = X1 - X2;
|
||
|
|
const int DX23 = X2 - X3;
|
||
|
|
const int DX31 = X3 - X1;
|
||
|
|
|
||
|
|
const int DY12 = Y1 - Y2;
|
||
|
|
const int DY23 = Y2 - Y3;
|
||
|
|
const int DY31 = Y3 - Y1;
|
||
|
|
|
||
|
|
// Fixed-point deltas
|
||
|
|
const int FDX12 = DX12 << 4;
|
||
|
|
const int FDX23 = DX23 << 4;
|
||
|
|
const int FDX31 = DX31 << 4;
|
||
|
|
|
||
|
|
const int FDY12 = DY12 << 4;
|
||
|
|
const int FDY23 = DY23 << 4;
|
||
|
|
const int FDY31 = DY31 << 4;
|
||
|
|
|
||
|
|
// Bounding rectangle
|
||
|
|
int minx = MAX((MIN(MIN(X1, X2), X3) + 0xF) >> 4, clipleft);
|
||
|
|
int maxx = MIN((MAX(MAX(X1, X2), X3) + 0xF) >> 4, clipright - 1);
|
||
|
|
int miny = MAX((MIN(MIN(Y1, Y2), Y3) + 0xF) >> 4, cliptop);
|
||
|
|
int maxy = MIN((MAX(MAX(Y1, Y2), Y3) + 0xF) >> 4, clipbottom - 1);
|
||
|
|
if (minx >= maxx || miny >= maxy)
|
||
|
|
return;
|
||
|
|
|
||
|
|
// Block size, standard 8x8 (must be power of two)
|
||
|
|
const int q = 8;
|
||
|
|
|
||
|
|
// Start in corner of 8x8 block
|
||
|
|
minx &= ~(q - 1);
|
||
|
|
miny &= ~(q - 1);
|
||
|
|
|
||
|
|
dest += miny * pitch;
|
||
|
|
|
||
|
|
// Half-edge constants
|
||
|
|
int C1 = DY12 * X1 - DX12 * Y1;
|
||
|
|
int C2 = DY23 * X2 - DX23 * Y2;
|
||
|
|
int C3 = DY31 * X3 - DX31 * Y3;
|
||
|
|
|
||
|
|
// Correct for fill convention
|
||
|
|
if (DY12 < 0 || (DY12 == 0 && DX12 > 0)) C1++;
|
||
|
|
if (DY23 < 0 || (DY23 == 0 && DX23 > 0)) C2++;
|
||
|
|
if (DY31 < 0 || (DY31 == 0 && DX31 > 0)) C3++;
|
||
|
|
|
||
|
|
// Loop through blocks
|
||
|
|
for (int y = miny; y < maxy; y += q, dest += q * pitch)
|
||
|
|
{
|
||
|
|
// Is this row of blocks done by this thread?
|
||
|
|
if (thread->skipped_by_thread(y / q)) continue;
|
||
|
|
|
||
|
|
for (int x = minx; x < maxx; x += q)
|
||
|
|
{
|
||
|
|
// Corners of block
|
||
|
|
int x0 = x << 4;
|
||
|
|
int x1 = (x + q - 1) << 4;
|
||
|
|
int y0 = y << 4;
|
||
|
|
int y1 = (y + q - 1) << 4;
|
||
|
|
|
||
|
|
// Evaluate half-space functions
|
||
|
|
bool a00 = C1 + DX12 * y0 - DY12 * x0 > 0;
|
||
|
|
bool a10 = C1 + DX12 * y0 - DY12 * x1 > 0;
|
||
|
|
bool a01 = C1 + DX12 * y1 - DY12 * x0 > 0;
|
||
|
|
bool a11 = C1 + DX12 * y1 - DY12 * x1 > 0;
|
||
|
|
int a = (a00 << 0) | (a10 << 1) | (a01 << 2) | (a11 << 3);
|
||
|
|
|
||
|
|
bool b00 = C2 + DX23 * y0 - DY23 * x0 > 0;
|
||
|
|
bool b10 = C2 + DX23 * y0 - DY23 * x1 > 0;
|
||
|
|
bool b01 = C2 + DX23 * y1 - DY23 * x0 > 0;
|
||
|
|
bool b11 = C2 + DX23 * y1 - DY23 * x1 > 0;
|
||
|
|
int b = (b00 << 0) | (b10 << 1) | (b01 << 2) | (b11 << 3);
|
||
|
|
|
||
|
|
bool c00 = C3 + DX31 * y0 - DY31 * x0 > 0;
|
||
|
|
bool c10 = C3 + DX31 * y0 - DY31 * x1 > 0;
|
||
|
|
bool c01 = C3 + DX31 * y1 - DY31 * x0 > 0;
|
||
|
|
bool c11 = C3 + DX31 * y1 - DY31 * x1 > 0;
|
||
|
|
int c = (c00 << 0) | (c10 << 1) | (c01 << 2) | (c11 << 3);
|
||
|
|
|
||
|
|
// Skip block when outside an edge
|
||
|
|
if (a == 0x0 || b == 0x0 || c == 0x0) continue;
|
||
|
|
|
||
|
|
// Check if block needs clipping
|
||
|
|
bool clipneeded = clipleft > x || clipright < (x + q) || cliptop > y || clipbottom < (y + q);
|
||
|
|
|
||
|
|
uint8_t *buffer = dest;
|
||
|
|
|
||
|
|
// Accept whole block when totally covered
|
||
|
|
if (a == 0xF && b == 0xF && c == 0xF && !clipneeded)
|
||
|
|
{
|
||
|
|
for (int iy = 0; iy < q; iy++)
|
||
|
|
{
|
||
|
|
for (int ix = x; ix < x + q; ix++)
|
||
|
|
{
|
||
|
|
buffer[ix] = solidcolor;
|
||
|
|
}
|
||
|
|
|
||
|
|
buffer += pitch;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else // Partially covered block
|
||
|
|
{
|
||
|
|
int CY1 = C1 + DX12 * y0 - DY12 * x0;
|
||
|
|
int CY2 = C2 + DX23 * y0 - DY23 * x0;
|
||
|
|
int CY3 = C3 + DX31 * y0 - DY31 * x0;
|
||
|
|
|
||
|
|
for (int iy = 0; iy < q; iy++)
|
||
|
|
{
|
||
|
|
int CX1 = CY1;
|
||
|
|
int CX2 = CY2;
|
||
|
|
int CX3 = CY3;
|
||
|
|
|
||
|
|
for (int ix = x; ix < x + q; ix++)
|
||
|
|
{
|
||
|
|
bool visible = ix >= clipleft && ix <= clipright && (cliptop <= y + iy) && (clipbottom > y + iy);
|
||
|
|
|
||
|
|
if (CX1 > 0 && CX2 > 0 && CX3 > 0 && visible)
|
||
|
|
{
|
||
|
|
buffer[ix] = solidcolor;
|
||
|
|
}
|
||
|
|
|
||
|
|
CX1 -= FDY12;
|
||
|
|
CX2 -= FDY23;
|
||
|
|
CX3 -= FDY31;
|
||
|
|
}
|
||
|
|
|
||
|
|
CY1 += FDX12;
|
||
|
|
CY2 += FDX23;
|
||
|
|
CY3 += FDX31;
|
||
|
|
|
||
|
|
buffer += pitch;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void ScreenPolyTriangleDrawer::draw32(const ScreenPolyTriangleDrawerArgs *args, DrawerThread *thread)
|
||
|
|
{
|
||
|
|
uint32_t *dest = (uint32_t *)args->dest;
|
||
|
|
int pitch = args->pitch;
|
||
|
|
const TriVertex &v1 = *args->v1;
|
||
|
|
const TriVertex &v2 = *args->v2;
|
||
|
|
const TriVertex &v3 = *args->v3;
|
||
|
|
int clipleft = args->clipleft;
|
||
|
|
int clipright = args->clipright;
|
||
|
|
int cliptop = args->cliptop;
|
||
|
|
int clipbottom = args->clipbottom;
|
||
|
|
const uint32_t *texturePixels = (const uint32_t *)args->texturePixels;
|
||
|
|
int textureWidth = args->textureWidth;
|
||
|
|
int textureHeight = args->textureHeight;
|
||
|
|
|
||
|
|
// 28.4 fixed-point coordinates
|
||
|
|
const int Y1 = (int)round(16.0f * v1.y);
|
||
|
|
const int Y2 = (int)round(16.0f * v2.y);
|
||
|
|
const int Y3 = (int)round(16.0f * v3.y);
|
||
|
|
|
||
|
|
const int X1 = (int)round(16.0f * v1.x);
|
||
|
|
const int X2 = (int)round(16.0f * v2.x);
|
||
|
|
const int X3 = (int)round(16.0f * v3.x);
|
||
|
|
|
||
|
|
// Deltas
|
||
|
|
const int DX12 = X1 - X2;
|
||
|
|
const int DX23 = X2 - X3;
|
||
|
|
const int DX31 = X3 - X1;
|
||
|
|
|
||
|
|
const int DY12 = Y1 - Y2;
|
||
|
|
const int DY23 = Y2 - Y3;
|
||
|
|
const int DY31 = Y3 - Y1;
|
||
|
|
|
||
|
|
// Fixed-point deltas
|
||
|
|
const int FDX12 = DX12 << 4;
|
||
|
|
const int FDX23 = DX23 << 4;
|
||
|
|
const int FDX31 = DX31 << 4;
|
||
|
|
|
||
|
|
const int FDY12 = DY12 << 4;
|
||
|
|
const int FDY23 = DY23 << 4;
|
||
|
|
const int FDY31 = DY31 << 4;
|
||
|
|
|
||
|
|
// Bounding rectangle
|
||
|
|
int minx = MAX((MIN(MIN(X1, X2), X3) + 0xF) >> 4, clipleft);
|
||
|
|
int maxx = MIN((MAX(MAX(X1, X2), X3) + 0xF) >> 4, clipright - 1);
|
||
|
|
int miny = MAX((MIN(MIN(Y1, Y2), Y3) + 0xF) >> 4, cliptop);
|
||
|
|
int maxy = MIN((MAX(MAX(Y1, Y2), Y3) + 0xF) >> 4, clipbottom - 1);
|
||
|
|
if (minx >= maxx || miny >= maxy)
|
||
|
|
return;
|
||
|
|
|
||
|
|
// Block size, standard 8x8 (must be power of two)
|
||
|
|
const int q = 8;
|
||
|
|
|
||
|
|
// Start in corner of 8x8 block
|
||
|
|
minx &= ~(q - 1);
|
||
|
|
miny &= ~(q - 1);
|
||
|
|
|
||
|
|
dest += miny * pitch;
|
||
|
|
|
||
|
|
// Half-edge constants
|
||
|
|
int C1 = DY12 * X1 - DX12 * Y1;
|
||
|
|
int C2 = DY23 * X2 - DX23 * Y2;
|
||
|
|
int C3 = DY31 * X3 - DX31 * Y3;
|
||
|
|
|
||
|
|
// Correct for fill convention
|
||
|
|
if (DY12 < 0 || (DY12 == 0 && DX12 > 0)) C1++;
|
||
|
|
if (DY23 < 0 || (DY23 == 0 && DX23 > 0)) C2++;
|
||
|
|
if (DY31 < 0 || (DY31 == 0 && DX31 > 0)) C3++;
|
||
|
|
|
||
|
|
// Gradients
|
||
|
|
float gradWX = gradx(v1.x, v1.y, v2.x, v2.y, v3.x, v3.y, v1.w, v2.w, v3.w);
|
||
|
|
float gradWY = grady(v1.x, v1.y, v2.x, v2.y, v3.x, v3.y, v1.w, v2.w, v3.w);
|
||
|
|
float startW = v1.w + gradWX * (minx - v1.x) + gradWY * (miny - v1.y);
|
||
|
|
float gradVaryingX[TriVertex::NumVarying], gradVaryingY[TriVertex::NumVarying], startVarying[TriVertex::NumVarying];
|
||
|
|
for (int i = 0; i < TriVertex::NumVarying; i++)
|
||
|
|
{
|
||
|
|
gradVaryingX[i] = gradx(v1.x, v1.y, v2.x, v2.y, v3.x, v3.y, v1.varying[i] * v1.w, v2.varying[i] * v2.w, v3.varying[i] * v3.w);
|
||
|
|
gradVaryingY[i] = grady(v1.x, v1.y, v2.x, v2.y, v3.x, v3.y, v1.varying[i] * v1.w, v2.varying[i] * v2.w, v3.varying[i] * v3.w);
|
||
|
|
startVarying[i] = v1.varying[i] * v1.w + gradVaryingX[i] * (minx - v1.x) + gradVaryingY[i] * (miny - v1.y);
|
||
|
|
}
|
||
|
|
|
||
|
|
// Loop through blocks
|
||
|
|
for (int y = miny; y < maxy; y += q, dest += q * pitch)
|
||
|
|
{
|
||
|
|
// Is this row of blocks done by this thread?
|
||
|
|
if (thread->skipped_by_thread(y / q)) continue;
|
||
|
|
|
||
|
|
for (int x = minx; x < maxx; x += q)
|
||
|
|
{
|
||
|
|
// Corners of block
|
||
|
|
int x0 = x << 4;
|
||
|
|
int x1 = (x + q - 1) << 4;
|
||
|
|
int y0 = y << 4;
|
||
|
|
int y1 = (y + q - 1) << 4;
|
||
|
|
|
||
|
|
// Evaluate half-space functions
|
||
|
|
bool a00 = C1 + DX12 * y0 - DY12 * x0 > 0;
|
||
|
|
bool a10 = C1 + DX12 * y0 - DY12 * x1 > 0;
|
||
|
|
bool a01 = C1 + DX12 * y1 - DY12 * x0 > 0;
|
||
|
|
bool a11 = C1 + DX12 * y1 - DY12 * x1 > 0;
|
||
|
|
int a = (a00 << 0) | (a10 << 1) | (a01 << 2) | (a11 << 3);
|
||
|
|
|
||
|
|
bool b00 = C2 + DX23 * y0 - DY23 * x0 > 0;
|
||
|
|
bool b10 = C2 + DX23 * y0 - DY23 * x1 > 0;
|
||
|
|
bool b01 = C2 + DX23 * y1 - DY23 * x0 > 0;
|
||
|
|
bool b11 = C2 + DX23 * y1 - DY23 * x1 > 0;
|
||
|
|
int b = (b00 << 0) | (b10 << 1) | (b01 << 2) | (b11 << 3);
|
||
|
|
|
||
|
|
bool c00 = C3 + DX31 * y0 - DY31 * x0 > 0;
|
||
|
|
bool c10 = C3 + DX31 * y0 - DY31 * x1 > 0;
|
||
|
|
bool c01 = C3 + DX31 * y1 - DY31 * x0 > 0;
|
||
|
|
bool c11 = C3 + DX31 * y1 - DY31 * x1 > 0;
|
||
|
|
int c = (c00 << 0) | (c10 << 1) | (c01 << 2) | (c11 << 3);
|
||
|
|
|
||
|
|
// Skip block when outside an edge
|
||
|
|
if (a == 0x0 || b == 0x0 || c == 0x0) continue;
|
||
|
|
|
||
|
|
// Check if block needs clipping
|
||
|
|
bool clipneeded = clipleft > x || clipright < (x + q) || cliptop > y || clipbottom < (y + q);
|
||
|
|
|
||
|
|
// Calculate varying variables for affine block
|
||
|
|
float offx0 = (x - minx) + 0.5f;
|
||
|
|
float offy0 = (y - miny) + 0.5f;
|
||
|
|
float offx1 = offx0 + q;
|
||
|
|
float offy1 = offy0 + q;
|
||
|
|
float rcpWTL = 1.0f / (startW + offx0 * gradWX + offy0 * gradWY);
|
||
|
|
float rcpWTR = 1.0f / (startW + offx1 * gradWX + offy0 * gradWY);
|
||
|
|
float rcpWBL = 1.0f / (startW + offx0 * gradWX + offy1 * gradWY);
|
||
|
|
float rcpWBR = 1.0f / (startW + offx1 * gradWX + offy1 * gradWY);
|
||
|
|
float varyingTL[TriVertex::NumVarying];
|
||
|
|
float varyingTR[TriVertex::NumVarying];
|
||
|
|
float varyingBL[TriVertex::NumVarying];
|
||
|
|
float varyingBR[TriVertex::NumVarying];
|
||
|
|
for (int i = 0; i < TriVertex::NumVarying; i++)
|
||
|
|
{
|
||
|
|
varyingTL[i] = (startVarying[i] + offx0 * gradVaryingX[i] + offy0 * gradVaryingY[i]) * rcpWTL;
|
||
|
|
varyingTR[i] = (startVarying[i] + offx1 * gradVaryingX[i] + offy0 * gradVaryingY[i]) * rcpWTR;
|
||
|
|
varyingBL[i] = ((startVarying[i] + offx0 * gradVaryingX[i] + offy1 * gradVaryingY[i]) * rcpWBL - varyingTL[i]) * (1.0f / q);
|
||
|
|
varyingBR[i] = ((startVarying[i] + offx1 * gradVaryingX[i] + offy1 * gradVaryingY[i]) * rcpWBR - varyingTR[i]) * (1.0f / q);
|
||
|
|
}
|
||
|
|
|
||
|
|
uint32_t *buffer = dest;
|
||
|
|
|
||
|
|
// Accept whole block when totally covered
|
||
|
|
if (a == 0xF && b == 0xF && c == 0xF && !clipneeded)
|
||
|
|
{
|
||
|
|
for (int iy = 0; iy < q; iy++)
|
||
|
|
{
|
||
|
|
float varying[TriVertex::NumVarying], varyingStep[TriVertex::NumVarying];
|
||
|
|
for (int i = 0; i < TriVertex::NumVarying; i++)
|
||
|
|
{
|
||
|
|
varying[i] = varyingTL[i] + varyingBL[i] * iy;
|
||
|
|
varyingStep[i] = (varyingTR[i] + varyingBR[i] * iy - varying[i]) * (1.0f / q);
|
||
|
|
}
|
||
|
|
|
||
|
|
for (int ix = x; ix < x + q; ix++)
|
||
|
|
{
|
||
|
|
uint32_t ufrac = (uint32_t)((varying[0] - floor(varying[0])) * 0x100000000LL);
|
||
|
|
uint32_t vfrac = (uint32_t)((varying[1] - floor(varying[1])) * 0x100000000LL);
|
||
|
|
uint32_t light = (uint32_t)clamp(varying[2] * 256.0f + 0.5f, 0.0f, 256.0f);
|
||
|
|
|
||
|
|
uint32_t upos = ((ufrac >> 16) * textureWidth) >> 16;
|
||
|
|
uint32_t vpos = ((vfrac >> 16) * textureHeight) >> 16;
|
||
|
|
uint32_t uvoffset = upos * textureHeight + vpos;
|
||
|
|
|
||
|
|
uint32_t fg = texturePixels[uvoffset];
|
||
|
|
uint32_t fg_red = (RPART(fg) * light) >> 8;
|
||
|
|
uint32_t fg_green = (GPART(fg) * light) >> 8;
|
||
|
|
uint32_t fg_blue = (BPART(fg) * light) >> 8;
|
||
|
|
uint32_t fg_alpha = APART(fg);
|
||
|
|
|
||
|
|
if (fg_alpha > 127)
|
||
|
|
buffer[ix] = 0xff000000 | (fg_red << 16) | (fg_green << 8) | fg_blue;
|
||
|
|
|
||
|
|
for (int i = 0; i < TriVertex::NumVarying; i++)
|
||
|
|
varying[i] += varyingStep[i];
|
||
|
|
}
|
||
|
|
|
||
|
|
buffer += pitch;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else // Partially covered block
|
||
|
|
{
|
||
|
|
int CY1 = C1 + DX12 * y0 - DY12 * x0;
|
||
|
|
int CY2 = C2 + DX23 * y0 - DY23 * x0;
|
||
|
|
int CY3 = C3 + DX31 * y0 - DY31 * x0;
|
||
|
|
|
||
|
|
for (int iy = 0; iy < q; iy++)
|
||
|
|
{
|
||
|
|
int CX1 = CY1;
|
||
|
|
int CX2 = CY2;
|
||
|
|
int CX3 = CY3;
|
||
|
|
|
||
|
|
float varying[TriVertex::NumVarying], varyingStep[TriVertex::NumVarying];
|
||
|
|
for (int i = 0; i < TriVertex::NumVarying; i++)
|
||
|
|
{
|
||
|
|
varying[i] = varyingTL[i] + varyingBL[i] * iy;
|
||
|
|
varyingStep[i] = (varyingTR[i] + varyingBR[i] * iy - varying[i]) * (1.0f / q);
|
||
|
|
}
|
||
|
|
|
||
|
|
for (int ix = x; ix < x + q; ix++)
|
||
|
|
{
|
||
|
|
bool visible = ix >= clipleft && ix <= clipright && (cliptop <= y + iy) && (clipbottom > y + iy);
|
||
|
|
|
||
|
|
if (CX1 > 0 && CX2 > 0 && CX3 > 0 && visible)
|
||
|
|
{
|
||
|
|
uint32_t ufrac = (uint32_t)((varying[0] - floor(varying[0])) * 0x100000000LL);
|
||
|
|
uint32_t vfrac = (uint32_t)((varying[1] - floor(varying[1])) * 0x100000000LL);
|
||
|
|
uint32_t light = (uint32_t)clamp(varying[2] * 256.0f + 0.5f, 0.0f, 256.0f);
|
||
|
|
|
||
|
|
uint32_t upos = ((ufrac >> 16) * textureWidth) >> 16;
|
||
|
|
uint32_t vpos = ((vfrac >> 16) * textureHeight) >> 16;
|
||
|
|
uint32_t uvoffset = upos * textureHeight + vpos;
|
||
|
|
|
||
|
|
uint32_t fg = texturePixels[uvoffset];
|
||
|
|
uint32_t fg_red = (RPART(fg) * light) >> 8;
|
||
|
|
uint32_t fg_green = (GPART(fg) * light) >> 8;
|
||
|
|
uint32_t fg_blue = (BPART(fg) * light) >> 8;
|
||
|
|
uint32_t fg_alpha = APART(fg);
|
||
|
|
|
||
|
|
if (fg_alpha > 127)
|
||
|
|
buffer[ix] = 0xff000000 | (fg_red << 16) | (fg_green << 8) | fg_blue;
|
||
|
|
}
|
||
|
|
|
||
|
|
for (int i = 0; i < TriVertex::NumVarying; i++)
|
||
|
|
varying[i] += varyingStep[i];
|
||
|
|
|
||
|
|
CX1 -= FDY12;
|
||
|
|
CX2 -= FDY23;
|
||
|
|
CX3 -= FDY31;
|
||
|
|
}
|
||
|
|
|
||
|
|
CY1 += FDX12;
|
||
|
|
CY2 += FDX23;
|
||
|
|
CY3 += FDX31;
|
||
|
|
|
||
|
|
buffer += pitch;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void ScreenPolyTriangleDrawer::fill32(const ScreenPolyTriangleDrawerArgs *args, DrawerThread *thread)
|
||
|
|
{
|
||
|
|
uint32_t *dest = (uint32_t *)args->dest;
|
||
|
|
int pitch = args->pitch;
|
||
|
|
const TriVertex &v1 = *args->v1;
|
||
|
|
const TriVertex &v2 = *args->v2;
|
||
|
|
const TriVertex &v3 = *args->v3;
|
||
|
|
int clipleft = args->clipleft;
|
||
|
|
int clipright = args->clipright;
|
||
|
|
int cliptop = args->cliptop;
|
||
|
|
int clipbottom = args->clipbottom;
|
||
|
|
int solidcolor = args->solidcolor;
|
||
|
|
|
||
|
|
// 28.4 fixed-point coordinates
|
||
|
|
const int Y1 = (int)round(16.0f * v1.y);
|
||
|
|
const int Y2 = (int)round(16.0f * v2.y);
|
||
|
|
const int Y3 = (int)round(16.0f * v3.y);
|
||
|
|
|
||
|
|
const int X1 = (int)round(16.0f * v1.x);
|
||
|
|
const int X2 = (int)round(16.0f * v2.x);
|
||
|
|
const int X3 = (int)round(16.0f * v3.x);
|
||
|
|
|
||
|
|
// Deltas
|
||
|
|
const int DX12 = X1 - X2;
|
||
|
|
const int DX23 = X2 - X3;
|
||
|
|
const int DX31 = X3 - X1;
|
||
|
|
|
||
|
|
const int DY12 = Y1 - Y2;
|
||
|
|
const int DY23 = Y2 - Y3;
|
||
|
|
const int DY31 = Y3 - Y1;
|
||
|
|
|
||
|
|
// Fixed-point deltas
|
||
|
|
const int FDX12 = DX12 << 4;
|
||
|
|
const int FDX23 = DX23 << 4;
|
||
|
|
const int FDX31 = DX31 << 4;
|
||
|
|
|
||
|
|
const int FDY12 = DY12 << 4;
|
||
|
|
const int FDY23 = DY23 << 4;
|
||
|
|
const int FDY31 = DY31 << 4;
|
||
|
|
|
||
|
|
// Bounding rectangle
|
||
|
|
int minx = MAX((MIN(MIN(X1, X2), X3) + 0xF) >> 4, clipleft);
|
||
|
|
int maxx = MIN((MAX(MAX(X1, X2), X3) + 0xF) >> 4, clipright - 1);
|
||
|
|
int miny = MAX((MIN(MIN(Y1, Y2), Y3) + 0xF) >> 4, cliptop);
|
||
|
|
int maxy = MIN((MAX(MAX(Y1, Y2), Y3) + 0xF) >> 4, clipbottom - 1);
|
||
|
|
if (minx >= maxx || miny >= maxy)
|
||
|
|
return;
|
||
|
|
|
||
|
|
// Block size, standard 8x8 (must be power of two)
|
||
|
|
const int q = 8;
|
||
|
|
|
||
|
|
// Start in corner of 8x8 block
|
||
|
|
minx &= ~(q - 1);
|
||
|
|
miny &= ~(q - 1);
|
||
|
|
|
||
|
|
dest += miny * pitch;
|
||
|
|
|
||
|
|
// Half-edge constants
|
||
|
|
int C1 = DY12 * X1 - DX12 * Y1;
|
||
|
|
int C2 = DY23 * X2 - DX23 * Y2;
|
||
|
|
int C3 = DY31 * X3 - DX31 * Y3;
|
||
|
|
|
||
|
|
// Correct for fill convention
|
||
|
|
if (DY12 < 0 || (DY12 == 0 && DX12 > 0)) C1++;
|
||
|
|
if (DY23 < 0 || (DY23 == 0 && DX23 > 0)) C2++;
|
||
|
|
if (DY31 < 0 || (DY31 == 0 && DX31 > 0)) C3++;
|
||
|
|
|
||
|
|
// Loop through blocks
|
||
|
|
for (int y = miny; y < maxy; y += q, dest += q * pitch)
|
||
|
|
{
|
||
|
|
// Is this row of blocks done by this thread?
|
||
|
|
if (thread->skipped_by_thread(y / q)) continue;
|
||
|
|
|
||
|
|
for (int x = minx; x < maxx; x += q)
|
||
|
|
{
|
||
|
|
// Corners of block
|
||
|
|
int x0 = x << 4;
|
||
|
|
int x1 = (x + q - 1) << 4;
|
||
|
|
int y0 = y << 4;
|
||
|
|
int y1 = (y + q - 1) << 4;
|
||
|
|
|
||
|
|
// Evaluate half-space functions
|
||
|
|
bool a00 = C1 + DX12 * y0 - DY12 * x0 > 0;
|
||
|
|
bool a10 = C1 + DX12 * y0 - DY12 * x1 > 0;
|
||
|
|
bool a01 = C1 + DX12 * y1 - DY12 * x0 > 0;
|
||
|
|
bool a11 = C1 + DX12 * y1 - DY12 * x1 > 0;
|
||
|
|
int a = (a00 << 0) | (a10 << 1) | (a01 << 2) | (a11 << 3);
|
||
|
|
|
||
|
|
bool b00 = C2 + DX23 * y0 - DY23 * x0 > 0;
|
||
|
|
bool b10 = C2 + DX23 * y0 - DY23 * x1 > 0;
|
||
|
|
bool b01 = C2 + DX23 * y1 - DY23 * x0 > 0;
|
||
|
|
bool b11 = C2 + DX23 * y1 - DY23 * x1 > 0;
|
||
|
|
int b = (b00 << 0) | (b10 << 1) | (b01 << 2) | (b11 << 3);
|
||
|
|
|
||
|
|
bool c00 = C3 + DX31 * y0 - DY31 * x0 > 0;
|
||
|
|
bool c10 = C3 + DX31 * y0 - DY31 * x1 > 0;
|
||
|
|
bool c01 = C3 + DX31 * y1 - DY31 * x0 > 0;
|
||
|
|
bool c11 = C3 + DX31 * y1 - DY31 * x1 > 0;
|
||
|
|
int c = (c00 << 0) | (c10 << 1) | (c01 << 2) | (c11 << 3);
|
||
|
|
|
||
|
|
// Skip block when outside an edge
|
||
|
|
if (a == 0x0 || b == 0x0 || c == 0x0) continue;
|
||
|
|
|
||
|
|
// Check if block needs clipping
|
||
|
|
bool clipneeded = clipleft > x || clipright < (x + q) || cliptop > y || clipbottom < (y + q);
|
||
|
|
|
||
|
|
uint32_t *buffer = dest;
|
||
|
|
|
||
|
|
// Accept whole block when totally covered
|
||
|
|
if (a == 0xF && b == 0xF && c == 0xF && !clipneeded)
|
||
|
|
{
|
||
|
|
for (int iy = 0; iy < q; iy++)
|
||
|
|
{
|
||
|
|
for (int ix = x; ix < x + q; ix++)
|
||
|
|
{
|
||
|
|
buffer[ix] = solidcolor;
|
||
|
|
}
|
||
|
|
|
||
|
|
buffer += pitch;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else // Partially covered block
|
||
|
|
{
|
||
|
|
int CY1 = C1 + DX12 * y0 - DY12 * x0;
|
||
|
|
int CY2 = C2 + DX23 * y0 - DY23 * x0;
|
||
|
|
int CY3 = C3 + DX31 * y0 - DY31 * x0;
|
||
|
|
|
||
|
|
for (int iy = 0; iy < q; iy++)
|
||
|
|
{
|
||
|
|
int CX1 = CY1;
|
||
|
|
int CX2 = CY2;
|
||
|
|
int CX3 = CY3;
|
||
|
|
|
||
|
|
for (int ix = x; ix < x + q; ix++)
|
||
|
|
{
|
||
|
|
bool visible = ix >= clipleft && ix <= clipright && (cliptop <= y + iy) && (clipbottom > y + iy);
|
||
|
|
|
||
|
|
if (CX1 > 0 && CX2 > 0 && CX3 > 0 && visible)
|
||
|
|
{
|
||
|
|
buffer[ix] = solidcolor;
|
||
|
|
}
|
||
|
|
|
||
|
|
CX1 -= FDY12;
|
||
|
|
CX2 -= FDY23;
|
||
|
|
CX3 -= FDY31;
|
||
|
|
}
|
||
|
|
|
||
|
|
CY1 += FDX12;
|
||
|
|
CY2 += FDX23;
|
||
|
|
CY3 += FDX31;
|
||
|
|
|
||
|
|
buffer += pitch;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
float ScreenPolyTriangleDrawer::gradx(float x0, float y0, float x1, float y1, float x2, float y2, float c0, float c1, float c2)
|
||
|
|
{
|
||
|
|
float top = (c1 - c2) * (y0 - y2) - (c0 - c2) * (y1 - y2);
|
||
|
|
float bottom = (x1 - x2) * (y0 - y2) - (x0 - x2) * (y1 - y2);
|
||
|
|
return top / bottom;
|
||
|
|
}
|
||
|
|
|
||
|
|
float ScreenPolyTriangleDrawer::grady(float x0, float y0, float x1, float y1, float x2, float y2, float c0, float c1, float c2)
|
||
|
|
{
|
||
|
|
float top = (c1 - c2) * (x0 - x2) - (c0 - c2) * (x1 - x2);
|
||
|
|
float bottom = -((x1 - x2) * (y0 - y2) - (x0 - x2) * (y1 - y2));
|
||
|
|
return top / bottom;
|
||
|
|
}
|
||
|
|
|
||
|
|
/////////////////////////////////////////////////////////////////////////////
|
||
|
|
|
||
|
|
DrawPolyTrianglesCommand::DrawPolyTrianglesCommand(const TriMatrix &objectToClip, const TriVertex *vinput, int vcount, TriangleDrawMode mode, bool ccw, int clipleft, int clipright, int cliptop, int clipbottom, const uint8_t *texturePixels, int textureWidth, int textureHeight, int solidcolor)
|
||
|
|
: objectToClip(objectToClip), vinput(vinput), vcount(vcount), mode(mode), ccw(ccw), clipleft(clipleft), clipright(clipright), cliptop(cliptop), clipbottom(clipbottom), texturePixels(texturePixels), textureWidth(textureWidth), textureHeight(textureHeight), solidcolor(solidcolor)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
void DrawPolyTrianglesCommand::Execute(DrawerThread *thread)
|
||
|
|
{
|
||
|
|
PolyTriangleDrawer::draw_arrays(
|
||
|
|
objectToClip, vinput, vcount, mode, ccw,
|
||
|
|
clipleft, clipright, cliptop, clipbottom,
|
||
|
|
texturePixels, textureWidth, textureHeight, solidcolor,
|
||
|
|
thread, texturePixels ? ScreenPolyTriangleDrawer::draw32 : ScreenPolyTriangleDrawer::fill32);
|
||
|
|
}
|
||
|
|
|
||
|
|
FString DrawPolyTrianglesCommand::DebugInfo()
|
||
|
|
{
|
||
|
|
return "DrawPolyTriangles";
|
||
|
|
}
|