mirror of https://github.com/ZDoom/gzdoom.git
236 lines
8.1 KiB
C++
236 lines
8.1 KiB
C++
/*
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** DrawWall code generation
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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 "precomp.h"
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#include "timestamp.h"
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#include "fixedfunction/drawwallcodegen.h"
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#include "ssa/ssa_function.h"
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#include "ssa/ssa_scope.h"
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#include "ssa/ssa_for_block.h"
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#include "ssa/ssa_if_block.h"
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#include "ssa/ssa_stack.h"
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#include "ssa/ssa_function.h"
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#include "ssa/ssa_struct_type.h"
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#include "ssa/ssa_value.h"
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void DrawWallCodegen::Generate(DrawWallVariant variant, bool fourColumns, SSAValue args, SSAValue thread_data)
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{
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dest = args[0][0].load(true);
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source[0] = args[0][1].load(true);
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source[1] = args[0][2].load(true);
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source[2] = args[0][3].load(true);
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source[3] = args[0][4].load(true);
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source2[0] = args[0][5].load(true);
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source2[1] = args[0][6].load(true);
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source2[2] = args[0][7].load(true);
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source2[3] = args[0][8].load(true);
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pitch = args[0][9].load(true);
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count = args[0][10].load(true);
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dest_y = args[0][11].load(true);
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texturefrac[0] = args[0][12].load(true);
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texturefrac[1] = args[0][13].load(true);
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texturefrac[2] = args[0][14].load(true);
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texturefrac[3] = args[0][15].load(true);
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texturefracx[0] = args[0][16].load(true);
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texturefracx[1] = args[0][17].load(true);
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texturefracx[2] = args[0][18].load(true);
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texturefracx[3] = args[0][19].load(true);
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iscale[0] = args[0][20].load(true);
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iscale[1] = args[0][21].load(true);
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iscale[2] = args[0][22].load(true);
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iscale[3] = args[0][23].load(true);
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textureheight[0] = args[0][24].load(true);
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textureheight[1] = args[0][25].load(true);
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textureheight[2] = args[0][26].load(true);
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textureheight[3] = args[0][27].load(true);
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light[0] = args[0][28].load(true);
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light[1] = args[0][29].load(true);
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light[2] = args[0][30].load(true);
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light[3] = args[0][31].load(true);
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srcalpha = args[0][32].load(true);
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destalpha = args[0][33].load(true);
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SSAShort light_alpha = args[0][34].load(true);
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SSAShort light_red = args[0][35].load(true);
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SSAShort light_green = args[0][36].load(true);
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SSAShort light_blue = args[0][37].load(true);
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SSAShort fade_alpha = args[0][38].load(true);
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SSAShort fade_red = args[0][39].load(true);
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SSAShort fade_green = args[0][40].load(true);
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SSAShort fade_blue = args[0][41].load(true);
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SSAShort desaturate = args[0][42].load(true);
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SSAInt flags = args[0][43].load(true);
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shade_constants.light = SSAVec4i(light_blue.zext_int(), light_green.zext_int(), light_red.zext_int(), light_alpha.zext_int());
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shade_constants.fade = SSAVec4i(fade_blue.zext_int(), fade_green.zext_int(), fade_red.zext_int(), fade_alpha.zext_int());
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shade_constants.desaturate = desaturate.zext_int();
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thread.core = thread_data[0][0].load(true);
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thread.num_cores = thread_data[0][1].load(true);
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thread.pass_start_y = thread_data[0][2].load(true);
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thread.pass_end_y = thread_data[0][3].load(true);
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is_simple_shade = (flags & DrawWallArgs::simple_shade) == SSAInt(DrawWallArgs::simple_shade);
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is_nearest_filter = (flags & DrawWallArgs::nearest_filter) == SSAInt(DrawWallArgs::nearest_filter);
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count = count_for_thread(dest_y, count, thread);
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dest = dest_for_thread(dest_y, pitch, dest, thread);
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pitch = pitch * thread.num_cores;
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int numColumns = fourColumns ? 4 : 1;
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for (int i = 0; i < numColumns; i++)
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{
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stack_frac[i].store(texturefrac[i] + iscale[i] * skipped_by_thread(dest_y, thread));
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fracstep[i] = iscale[i] * thread.num_cores;
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one[i] = ((0x80000000 + textureheight[i] - 1) / textureheight[i]) * 2 + 1;
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}
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SSAIfBlock branch;
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branch.if_block(is_simple_shade);
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LoopShade(variant, fourColumns, true);
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branch.else_block();
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LoopShade(variant, fourColumns, false);
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branch.end_block();
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}
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void DrawWallCodegen::LoopShade(DrawWallVariant variant, bool fourColumns, bool isSimpleShade)
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{
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SSAIfBlock branch;
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branch.if_block(is_nearest_filter);
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Loop(variant, fourColumns, isSimpleShade, true);
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branch.else_block();
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int numColumns = fourColumns ? 4 : 1;
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for (int i = 0; i < numColumns; i++)
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stack_frac[i].store(stack_frac[i].load() - (one[i] / 2));
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Loop(variant, fourColumns, isSimpleShade, false);
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branch.end_block();
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}
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void DrawWallCodegen::Loop(DrawWallVariant variant, bool fourColumns, bool isSimpleShade, bool isNearestFilter)
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{
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int numColumns = fourColumns ? 4 : 1;
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stack_index.store(SSAInt(0));
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{
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SSAForBlock loop;
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SSAInt index = stack_index.load();
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loop.loop_block(index < count);
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SSAInt frac[4];
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for (int i = 0; i < numColumns; i++)
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frac[i] = stack_frac[i].load();
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SSAInt offset = index * pitch * 4;
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if (fourColumns)
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{
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SSAVec16ub bg = dest[offset].load_unaligned_vec16ub(false);
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SSAVec8s bg0 = SSAVec8s::extendlo(bg);
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SSAVec8s bg1 = SSAVec8s::extendhi(bg);
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SSAVec4i bgcolors[4] =
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{
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SSAVec4i::extendlo(bg0),
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SSAVec4i::extendhi(bg0),
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SSAVec4i::extendlo(bg1),
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SSAVec4i::extendhi(bg1)
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};
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SSAVec4i colors[4];
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for (int i = 0; i < 4; i++)
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colors[i] = Blend(Shade(Sample(frac[i], i, isNearestFilter), i, isSimpleShade), bgcolors[i], variant);
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SSAVec16ub color(SSAVec8s(colors[0], colors[1]), SSAVec8s(colors[2], colors[3]));
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dest[offset].store_unaligned_vec16ub(color);
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}
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else
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{
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SSAVec4i bgcolor = dest[offset].load_vec4ub(false);
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SSAVec4i color = Blend(Shade(Sample(frac[0], 0, isNearestFilter), 0, isSimpleShade), bgcolor, variant);
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dest[offset].store_vec4ub(color);
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}
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stack_index.store(index.add(SSAInt(1), true, true));
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for (int i = 0; i < numColumns; i++)
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stack_frac[i].store(frac[i] + fracstep[i]);
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loop.end_block();
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}
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}
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SSAVec4i DrawWallCodegen::Sample(SSAInt frac, int index, bool isNearestFilter)
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{
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if (isNearestFilter)
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{
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SSAInt sample_index = ((frac >> FRACBITS) * textureheight[index]) >> FRACBITS;
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return source[index][sample_index * 4].load_vec4ub(false);
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}
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else
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{
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return SampleLinear(source[index], source2[index], texturefracx[index], frac, one[index], textureheight[index]);
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}
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}
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SSAVec4i DrawWallCodegen::SampleLinear(SSAUBytePtr col0, SSAUBytePtr col1, SSAInt texturefracx, SSAInt texturefracy, SSAInt one, SSAInt height)
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{
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SSAInt frac_y0 = (texturefracy >> FRACBITS) * height;
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SSAInt frac_y1 = ((texturefracy + one) >> FRACBITS) * height;
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SSAInt y0 = frac_y0 >> FRACBITS;
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SSAInt y1 = frac_y1 >> FRACBITS;
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SSAVec4i p00 = col0[y0 * 4].load_vec4ub(true);
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SSAVec4i p01 = col0[y1 * 4].load_vec4ub(true);
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SSAVec4i p10 = col1[y0 * 4].load_vec4ub(true);
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SSAVec4i p11 = col1[y1 * 4].load_vec4ub(true);
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SSAInt inv_b = texturefracx;
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SSAInt a = (frac_y1 >> (FRACBITS - 4)) & 15;
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SSAInt inv_a = 16 - a;
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SSAInt b = 16 - inv_b;
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return (p00 * (a * b) + p01 * (inv_a * b) + p10 * (a * inv_b) + p11 * (inv_a * inv_b) + 127) >> 8;
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}
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SSAVec4i DrawWallCodegen::Shade(SSAVec4i fg, int index, bool isSimpleShade)
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{
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if (isSimpleShade)
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return shade_bgra_simple(fg, light[index]);
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else
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return shade_bgra_advanced(fg, light[index], shade_constants);
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}
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SSAVec4i DrawWallCodegen::Blend(SSAVec4i fg, SSAVec4i bg, DrawWallVariant variant)
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{
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switch (variant)
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{
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default:
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case DrawWallVariant::Opaque:
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return blend_copy(fg);
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case DrawWallVariant::Masked:
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return blend_alpha_blend(fg, bg);
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case DrawWallVariant::Add:
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case DrawWallVariant::AddClamp:
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return blend_add(fg, bg, srcalpha, calc_blend_bgalpha(fg, destalpha));
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case DrawWallVariant::SubClamp:
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return blend_sub(fg, bg, srcalpha, calc_blend_bgalpha(fg, destalpha));
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case DrawWallVariant::RevSubClamp:
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return blend_revsub(fg, bg, srcalpha, calc_blend_bgalpha(fg, destalpha));
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}
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}
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