gzdoom-gles/src/polyrenderer/drawers/poly_triangle.h

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/*
** Triangle drawers
** Copyright (c) 2016 Magnus Norddahl
**
** This software is provided 'as-is', without any express or implied
** warranty. In no event will the authors be held liable for any damages
** arising from the use of this software.
**
** Permission is granted to anyone to use this software for any purpose,
** including commercial applications, and to alter it and redistribute it
** freely, subject to the following restrictions:
**
** 1. The origin of this software must not be misrepresented; you must not
** claim that you wrote the original software. If you use this software
** in a product, an acknowledgment in the product documentation would be
** appreciated but is not required.
** 2. Altered source versions must be plainly marked as such, and must not be
** misrepresented as being the original software.
** 3. This notice may not be removed or altered from any source distribution.
**
*/
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#pragma once
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#include "swrenderer/drawers/r_draw.h"
#include "swrenderer/drawers/r_thread.h"
#include "swrenderer/drawers/r_drawers.h"
#include "r_data/r_translate.h"
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#include "r_data/colormaps.h"
class FTexture;
enum class TriangleDrawMode
{
Normal,
Fan,
Strip
};
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struct TriDrawTriangleArgs;
struct TriMatrix;
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class PolyDrawArgs
{
public:
TriUniforms uniforms;
const TriMatrix *objectToClip = nullptr;
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const TriVertex *vinput = nullptr;
int vcount = 0;
TriangleDrawMode mode = TriangleDrawMode::Normal;
bool ccw = false;
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// bool stencilTest = true; // Always true for now
bool subsectorTest = false;
bool writeStencil = true;
bool writeColor = true;
bool writeSubsector = true;
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const uint8_t *texturePixels = nullptr;
int textureWidth = 0;
int textureHeight = 0;
const uint8_t *translation = nullptr;
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uint8_t stenciltestvalue = 0;
uint8_t stencilwritevalue = 0;
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const uint8_t *colormaps = nullptr;
float clipPlane[4];
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TriBlendMode blendmode = TriBlendMode::Copy;
void SetClipPlane(float a, float b, float c, float d)
{
clipPlane[0] = a;
clipPlane[1] = b;
clipPlane[2] = c;
clipPlane[3] = d;
}
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void SetTexture(FTexture *texture)
{
textureWidth = texture->GetWidth();
textureHeight = texture->GetHeight();
if (swrenderer::r_swtruecolor)
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texturePixels = (const uint8_t *)texture->GetPixelsBgra();
else
texturePixels = texture->GetPixels();
translation = nullptr;
}
void SetTexture(FTexture *texture, uint32_t translationID, bool forcePal = false)
{
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if (translationID != 0xffffffff && translationID != 0)
{
FRemapTable *table = TranslationToTable(translationID);
if (table != nullptr && !table->Inactive)
{
if (swrenderer::r_swtruecolor)
translation = (uint8_t*)table->Palette;
else
translation = table->Remap;
textureWidth = texture->GetWidth();
textureHeight = texture->GetHeight();
texturePixels = texture->GetPixels();
return;
}
}
if (forcePal)
{
textureWidth = texture->GetWidth();
textureHeight = texture->GetHeight();
texturePixels = texture->GetPixels();
}
else
{
SetTexture(texture);
}
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}
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void SetColormap(FSWColormap *base_colormap)
{
uniforms.light_red = base_colormap->Color.r * 256 / 255;
uniforms.light_green = base_colormap->Color.g * 256 / 255;
uniforms.light_blue = base_colormap->Color.b * 256 / 255;
uniforms.light_alpha = base_colormap->Color.a * 256 / 255;
uniforms.fade_red = base_colormap->Fade.r;
uniforms.fade_green = base_colormap->Fade.g;
uniforms.fade_blue = base_colormap->Fade.b;
uniforms.fade_alpha = base_colormap->Fade.a;
uniforms.desaturate = MIN(abs(base_colormap->Desaturate), 255) * 255 / 256;
bool simple_shade = (base_colormap->Color.d == 0x00ffffff && base_colormap->Fade.d == 0x00000000 && base_colormap->Desaturate == 0);
if (simple_shade)
uniforms.flags |= TriUniforms::simple_shade;
else
uniforms.flags &= ~TriUniforms::simple_shade;
colormaps = base_colormap->Maps;
}
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};
struct ShadedTriVertex : public TriVertex
{
float clipDistance0;
};
struct TriMatrix
{
static TriMatrix null();
static TriMatrix identity();
static TriMatrix translate(float x, float y, float z);
static TriMatrix scale(float x, float y, float z);
static TriMatrix rotate(float angle, float x, float y, float z);
static TriMatrix swapYZ();
static TriMatrix perspective(float fovy, float aspect, float near, float far);
static TriMatrix frustum(float left, float right, float bottom, float top, float near, float far);
static TriMatrix worldToView(); // Software renderer world to view space transform
static TriMatrix viewToClip(); // Software renderer shearing projection
ShadedTriVertex operator*(TriVertex v) const;
TriMatrix operator*(const TriMatrix &m) const;
float matrix[16];
};
typedef void(*PolyDrawFuncPtr)(const TriDrawTriangleArgs *, WorkerThreadData *);
class PolyTriangleDrawer
{
public:
static void set_viewport(int x, int y, int width, int height, DCanvas *canvas);
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static void draw(const PolyDrawArgs &args);
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static void toggle_mirror();
private:
static ShadedTriVertex shade_vertex(const TriMatrix &objectToClip, const float *clipPlane, const TriVertex &v);
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static void draw_arrays(const PolyDrawArgs &args, WorkerThreadData *thread);
static void draw_shaded_triangle(const ShadedTriVertex *vertices, bool ccw, TriDrawTriangleArgs *args, WorkerThreadData *thread, PolyDrawFuncPtr *drawfuncs, int num_drawfuncs);
static bool cullhalfspace(float clipdistance1, float clipdistance2, float &t1, float &t2);
static void clipedge(const ShadedTriVertex *verts, TriVertex *clippedvert, int &numclipvert);
static int viewport_x, viewport_y, viewport_width, viewport_height, dest_pitch, dest_width, dest_height;
static bool dest_bgra;
static uint8_t *dest;
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static bool mirror;
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enum { max_additional_vertices = 16 };
friend class DrawPolyTrianglesCommand;
};
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class PolySubsectorGBuffer
{
public:
static PolySubsectorGBuffer *Instance()
{
static PolySubsectorGBuffer buffer;
return &buffer;
}
void Resize(int newwidth, int newheight)
{
width = newwidth;
height = newheight;
values.resize(width * height);
}
int Width() const { return width; }
int Height() const { return height; }
uint32_t *Values() { return values.data(); }
private:
int width;
int height;
std::vector<uint32_t> values;
};
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class PolyStencilBuffer
{
public:
static PolyStencilBuffer *Instance()
{
static PolyStencilBuffer buffer;
return &buffer;
}
void Clear(int newwidth, int newheight, uint8_t stencil_value = 0)
{
width = newwidth;
height = newheight;
int count = BlockWidth() * BlockHeight();
values.resize(count * 64);
masks.resize(count);
uint8_t *v = Values();
uint32_t *m = Masks();
for (int i = 0; i < count; i++)
{
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m[i] = 0xffffff00 | stencil_value;
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}
}
int Width() const { return width; }
int Height() const { return height; }
int BlockWidth() const { return (width + 7) / 8; }
int BlockHeight() const { return (height + 7) / 8; }
uint8_t *Values() { return values.data(); }
uint32_t *Masks() { return masks.data(); }
private:
int width;
int height;
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// 8x8 blocks of stencil values, plus a mask for each block indicating if values are the same for early out stencil testing
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std::vector<uint8_t> values;
std::vector<uint32_t> masks;
};
class DrawPolyTrianglesCommand : public DrawerCommand
{
public:
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DrawPolyTrianglesCommand(const PolyDrawArgs &args, bool mirror);
void Execute(DrawerThread *thread) override;
FString DebugInfo() override;
private:
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PolyDrawArgs args;
};
class PolyVertexBuffer
{
public:
static TriVertex *GetVertices(int count);
static void Clear();
};
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struct ScreenTriangleStepVariables
{
float W;
float Varying[TriVertex::NumVarying];
};
class ScreenTriangle
{
public:
static void SetupNormal(const TriDrawTriangleArgs *args, WorkerThreadData *thread);
static void SetupSubsector(const TriDrawTriangleArgs *args, WorkerThreadData *thread);
static void StencilWrite(const TriDrawTriangleArgs *args, WorkerThreadData *thread);
static void SubsectorWrite(const TriDrawTriangleArgs *args, WorkerThreadData *thread);
};