gzdoom/tools/drawergen/fixedfunction/setuptrianglecodegen.cpp
2016-12-16 15:25:03 +01:00

573 lines
17 KiB
C++

/*
** DrawTriangle code generation
** 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.
**
*/
#include "precomp.h"
#include "timestamp.h"
#include "fixedfunction/setuptrianglecodegen.h"
#include "ssa/ssa_function.h"
#include "ssa/ssa_scope.h"
#include "ssa/ssa_for_block.h"
#include "ssa/ssa_if_block.h"
#include "ssa/ssa_stack.h"
#include "ssa/ssa_function.h"
#include "ssa/ssa_struct_type.h"
#include "ssa/ssa_value.h"
void SetupTriangleCodegen::Generate(bool subsectorTest, SSAValue args, SSAValue thread_data)
{
this->subsectorTest = subsectorTest;
LoadArgs(args, thread_data);
Setup();
LoopBlockY();
}
SSAInt SetupTriangleCodegen::FloatTo28_4(SSAFloat v)
{
// SSAInt(SSAFloat::round(16.0f * v), false);
SSAInt a = SSAInt(v * 32.0f, false);
return (a + (a.ashr(31) | SSAInt(1))).ashr(1);
}
void SetupTriangleCodegen::Setup()
{
// 28.4 fixed-point coordinates
Y1 = FloatTo28_4(v1.y);
Y2 = FloatTo28_4(v2.y);
Y3 = FloatTo28_4(v3.y);
X1 = FloatTo28_4(v1.x);
X2 = FloatTo28_4(v2.x);
X3 = FloatTo28_4(v3.x);
// Deltas
DX12 = X1 - X2;
DX23 = X2 - X3;
DX31 = X3 - X1;
DY12 = Y1 - Y2;
DY23 = Y2 - Y3;
DY31 = Y3 - Y1;
// Fixed-point deltas
FDX12 = DX12 << 4;
FDX23 = DX23 << 4;
FDX31 = DX31 << 4;
FDY12 = DY12 << 4;
FDY23 = DY23 << 4;
FDY31 = DY31 << 4;
// Bounding rectangle
minx = SSAInt::MAX((SSAInt::MIN(SSAInt::MIN(X1, X2), X3) + 0xF).ashr(4), SSAInt(0));
maxx = SSAInt::MIN((SSAInt::MAX(SSAInt::MAX(X1, X2), X3) + 0xF).ashr(4), clipright - 1);
miny = SSAInt::MAX((SSAInt::MIN(SSAInt::MIN(Y1, Y2), Y3) + 0xF).ashr(4), SSAInt(0));
maxy = SSAInt::MIN((SSAInt::MAX(SSAInt::MAX(Y1, Y2), Y3) + 0xF).ashr(4), clipbottom - 1);
SSAIfBlock if0;
if0.if_block(minx >= maxx || miny >= maxy);
if0.end_retvoid();
// Start in corner of 8x8 block
minx = minx & ~(q - 1);
miny = miny & ~(q - 1);
// Half-edge constants
C1 = DY12 * X1 - DX12 * Y1;
C2 = DY23 * X2 - DX23 * Y2;
C3 = DY31 * X3 - DX31 * Y3;
// Correct for fill convention
SSAIfBlock if1;
if1.if_block(DY12 < SSAInt(0) || (DY12 == SSAInt(0) && DX12 > SSAInt(0)));
stack_C1.store(C1 + 1);
if1.else_block();
stack_C1.store(C1);
if1.end_block();
C1 = stack_C1.load();
SSAIfBlock if2;
if2.if_block(DY23 < SSAInt(0) || (DY23 == SSAInt(0) && DX23 > SSAInt(0)));
stack_C2.store(C2 + 1);
if2.else_block();
stack_C2.store(C2);
if2.end_block();
C2 = stack_C2.load();
SSAIfBlock if3;
if3.if_block(DY31 < SSAInt(0) || (DY31 == SSAInt(0) && DX31 > SSAInt(0)));
stack_C3.store(C3 + 1);
if3.else_block();
stack_C3.store(C3);
if3.end_block();
C3 = stack_C3.load();
}
void SetupTriangleCodegen::LoopBlockY()
{
SSAInt blocks_skipped = skipped_by_thread(miny / q, thread);
stack_y.store(miny + blocks_skipped * q);
stack_subsectorGBuffer.store(subsectorGBuffer[blocks_skipped * q * pitch]);
SSAForBlock loop;
y = stack_y.load();
subsectorGBuffer = stack_subsectorGBuffer.load();
loop.loop_block(y < maxy, 0);
{
LoopBlockX();
stack_subsectorGBuffer.store(subsectorGBuffer[q * pitch * thread.num_cores]);
stack_y.store(y + thread.num_cores * q);
}
loop.end_block();
}
void SetupTriangleCodegen::LoopBlockX()
{
stack_x.store(minx);
SSAForBlock loop;
x = stack_x.load();
loop.loop_block(x < maxx, 0);
{
// Corners of block
x0 = x << 4;
x1 = (x + q - 1) << 4;
y0 = y << 4;
y1 = (y + q - 1) << 4;
// Evaluate half-space functions
SSABool a00 = C1 + DX12 * y0 - DY12 * x0 > SSAInt(0);
SSABool a10 = C1 + DX12 * y0 - DY12 * x1 > SSAInt(0);
SSABool a01 = C1 + DX12 * y1 - DY12 * x0 > SSAInt(0);
SSABool a11 = C1 + DX12 * y1 - DY12 * x1 > SSAInt(0);
SSAInt a = (a00.zext_int() << 0) | (a10.zext_int() << 1) | (a01.zext_int() << 2) | (a11.zext_int() << 3);
SSABool b00 = C2 + DX23 * y0 - DY23 * x0 > SSAInt(0);
SSABool b10 = C2 + DX23 * y0 - DY23 * x1 > SSAInt(0);
SSABool b01 = C2 + DX23 * y1 - DY23 * x0 > SSAInt(0);
SSABool b11 = C2 + DX23 * y1 - DY23 * x1 > SSAInt(0);
SSAInt b = (b00.zext_int() << 0) | (b10.zext_int() << 1) | (b01.zext_int() << 2) | (b11.zext_int() << 3);
SSABool c00 = C3 + DX31 * y0 - DY31 * x0 > SSAInt(0);
SSABool c10 = C3 + DX31 * y0 - DY31 * x1 > SSAInt(0);
SSABool c01 = C3 + DX31 * y1 - DY31 * x0 > SSAInt(0);
SSABool c11 = C3 + DX31 * y1 - DY31 * x1 > SSAInt(0);
SSAInt c = (c00.zext_int() << 0) | (c10.zext_int() << 1) | (c01.zext_int() << 2) | (c11.zext_int() << 3);
// Skip block when outside an edge
SSABool process_block = !(a == SSAInt(0) || b == SSAInt(0) || c == SSAInt(0));
SetStencilBlock(x / 8 + y / 8 * stencilPitch);
// Stencil test the whole block, if possible
if (subsectorTest)
{
process_block = process_block && (!StencilIsSingleValue() || SSABool::compare_uge(StencilGetSingle(), stencilTestValue));
}
else
{
process_block = process_block && (!StencilIsSingleValue() || StencilGetSingle() == stencilTestValue);
}
SSAIfBlock branch;
branch.if_block(process_block);
// Check if block needs clipping
SSABool clipneeded = (x + q) > clipright || (y + q) > clipbottom;
SSABool covered = a == SSAInt(0xF) && b == SSAInt(0xF) && c == SSAInt(0xF) && !clipneeded && StencilIsSingleValue();
// Accept whole block when totally covered
SSAIfBlock branch_covered;
branch_covered.if_block(covered);
{
LoopFullBlock();
}
branch_covered.else_block();
{
SSAIfBlock branch_covered_stencil;
branch_covered_stencil.if_block(StencilIsSingleValue());
{
SSABool stenciltestpass;
if (subsectorTest)
{
stenciltestpass = SSABool::compare_uge(StencilGetSingle(), stencilTestValue);
}
else
{
stenciltestpass = StencilGetSingle() == stencilTestValue;
}
SSAIfBlock branch_stenciltestpass;
branch_stenciltestpass.if_block(stenciltestpass);
{
LoopPartialBlock(true);
}
branch_stenciltestpass.end_block();
}
branch_covered_stencil.else_block();
{
LoopPartialBlock(false);
}
branch_covered_stencil.end_block();
}
branch_covered.end_block();
branch.end_block();
stack_x.store(x + q);
}
loop.end_block();
}
void SetupTriangleCodegen::LoopFullBlock()
{
/*
if (variant == TriDrawVariant::Stencil)
{
StencilClear(stencilWriteValue);
}
else if (variant == TriDrawVariant::StencilClose)
{
StencilClear(stencilWriteValue);
for (int iy = 0; iy < q; iy++)
{
SSAIntPtr subsectorbuffer = subsectorGBuffer[x + iy * pitch];
for (int ix = 0; ix < q; ix += 4)
{
subsectorbuffer[ix].store_unaligned_vec4i(SSAVec4i(subsectorDepth));
}
}
}
else
{
int pixelsize = truecolor ? 4 : 1;
AffineW = posx_w;
for (int i = 0; i < TriVertex::NumVarying; i++)
AffineVaryingPosY[i] = posx_varying[i];
for (int iy = 0; iy < q; iy++)
{
SSAUBytePtr buffer = dest[(x + iy * pitch) * pixelsize];
SSAIntPtr subsectorbuffer = subsectorGBuffer[x + iy * pitch];
SetupAffineBlock();
for (int ix = 0; ix < q; ix += 4)
{
SSAUBytePtr buf = buffer[ix * pixelsize];
if (truecolor)
{
SSAVec16ub pixels16 = buf.load_unaligned_vec16ub(false);
SSAVec8s pixels8hi = SSAVec8s::extendhi(pixels16);
SSAVec8s pixels8lo = SSAVec8s::extendlo(pixels16);
SSAVec4i pixels[4] =
{
SSAVec4i::extendlo(pixels8lo),
SSAVec4i::extendhi(pixels8lo),
SSAVec4i::extendlo(pixels8hi),
SSAVec4i::extendhi(pixels8hi)
};
for (int sse = 0; sse < 4; sse++)
{
if (variant == TriDrawVariant::DrawSubsector || variant == TriDrawVariant::FillSubsector || variant == TriDrawVariant::FuzzSubsector)
{
SSABool subsectorTest = subsectorbuffer[ix].load(true) >= subsectorDepth;
pixels[sse] = subsectorTest.select(ProcessPixel32(pixels[sse], AffineVaryingPosX), pixels[sse]);
}
else
{
pixels[sse] = ProcessPixel32(pixels[sse], AffineVaryingPosX);
}
for (int i = 0; i < TriVertex::NumVarying; i++)
AffineVaryingPosX[i] = AffineVaryingPosX[i] + AffineVaryingStepX[i];
}
buf.store_unaligned_vec16ub(SSAVec16ub(SSAVec8s(pixels[0], pixels[1]), SSAVec8s(pixels[2], pixels[3])));
}
else
{
SSAVec4i pixelsvec = buf.load_vec4ub(false);
SSAInt pixels[4] =
{
pixelsvec[0],
pixelsvec[1],
pixelsvec[2],
pixelsvec[3]
};
for (int sse = 0; sse < 4; sse++)
{
if (variant == TriDrawVariant::DrawSubsector || variant == TriDrawVariant::FillSubsector || variant == TriDrawVariant::FuzzSubsector)
{
SSABool subsectorTest = subsectorbuffer[ix].load(true) >= subsectorDepth;
pixels[sse] = subsectorTest.select(ProcessPixel8(pixels[sse], AffineVaryingPosX), pixels[sse]);
}
else
{
pixels[sse] = ProcessPixel8(pixels[sse], AffineVaryingPosX);
}
for (int i = 0; i < TriVertex::NumVarying; i++)
AffineVaryingPosX[i] = AffineVaryingPosX[i] + AffineVaryingStepX[i];
}
buf.store_vec4ub(SSAVec4i(pixels[0], pixels[1], pixels[2], pixels[3]));
}
if (variant != TriDrawVariant::DrawSubsector && variant != TriDrawVariant::FillSubsector && variant != TriDrawVariant::FuzzSubsector)
subsectorbuffer[ix].store_unaligned_vec4i(SSAVec4i(subsectorDepth));
}
AffineW = AffineW + gradWY;
for (int i = 0; i < TriVertex::NumVarying; i++)
AffineVaryingPosY[i] = AffineVaryingPosY[i] + gradVaryingY[i];
}
}
*/
}
void SetupTriangleCodegen::LoopPartialBlock(bool isSingleStencilValue)
{
/*
int pixelsize = truecolor ? 4 : 1;
if (variant == TriDrawVariant::Stencil || variant == TriDrawVariant::StencilClose)
{
if (isSingleStencilValue)
{
SSAInt stencilMask = StencilBlockMask.load(false);
SSAUByte val0 = stencilMask.trunc_ubyte();
for (int i = 0; i < 8 * 8; i++)
StencilBlock[i].store(val0);
StencilBlockMask.store(SSAInt(0));
}
SSAUByte lastStencilValue = StencilBlock[0].load(false);
stack_stencilblock_restored.store(SSABool(true));
stack_stencilblock_lastval.store(lastStencilValue);
}
stack_CY1.store(C1 + DX12 * y0 - DY12 * x0);
stack_CY2.store(C2 + DX23 * y0 - DY23 * x0);
stack_CY3.store(C3 + DX31 * y0 - DY31 * x0);
stack_iy.store(SSAInt(0));
stack_buffer.store(dest[x * pixelsize]);
stack_subsectorbuffer.store(subsectorGBuffer[x]);
stack_AffineW.store(posx_w);
for (int i = 0; i < TriVertex::NumVarying; i++)
{
stack_AffineVaryingPosY[i].store(posx_varying[i]);
}
SSAForBlock loopy;
SSAInt iy = stack_iy.load();
SSAUBytePtr buffer = stack_buffer.load();
SSAIntPtr subsectorbuffer = stack_subsectorbuffer.load();
SSAInt CY1 = stack_CY1.load();
SSAInt CY2 = stack_CY2.load();
SSAInt CY3 = stack_CY3.load();
AffineW = stack_AffineW.load();
for (int i = 0; i < TriVertex::NumVarying; i++)
AffineVaryingPosY[i] = stack_AffineVaryingPosY[i].load();
loopy.loop_block(iy < SSAInt(q), q);
{
SetupAffineBlock();
for (int i = 0; i < TriVertex::NumVarying; i++)
stack_AffineVaryingPosX[i].store(AffineVaryingPosX[i]);
stack_CX1.store(CY1);
stack_CX2.store(CY2);
stack_CX3.store(CY3);
stack_ix.store(SSAInt(0));
SSAForBlock loopx;
SSABool stencilblock_restored;
SSAUByte lastStencilValue;
if (variant == TriDrawVariant::Stencil || variant == TriDrawVariant::StencilClose)
{
stencilblock_restored = stack_stencilblock_restored.load();
lastStencilValue = stack_stencilblock_lastval.load();
}
SSAInt ix = stack_ix.load();
SSAInt CX1 = stack_CX1.load();
SSAInt CX2 = stack_CX2.load();
SSAInt CX3 = stack_CX3.load();
for (int i = 0; i < TriVertex::NumVarying; i++)
AffineVaryingPosX[i] = stack_AffineVaryingPosX[i].load();
loopx.loop_block(ix < SSAInt(q), q);
{
SSABool visible = (ix + x < clipright) && (iy + y < clipbottom);
SSABool covered = CX1 > SSAInt(0) && CX2 > SSAInt(0) && CX3 > SSAInt(0) && visible;
if (!isSingleStencilValue)
{
SSAUByte stencilValue = StencilBlock[ix + iy * 8].load(false);
if (variant == TriDrawVariant::DrawSubsector || variant == TriDrawVariant::FillSubsector || variant == TriDrawVariant::FuzzSubsector)
{
covered = covered && SSABool::compare_uge(stencilValue, stencilTestValue) && subsectorbuffer[ix].load(true) >= subsectorDepth;
}
else if (variant == TriDrawVariant::StencilClose)
{
covered = covered && SSABool::compare_uge(stencilValue, stencilTestValue);
}
else
{
covered = covered && stencilValue == stencilTestValue;
}
}
else if (variant == TriDrawVariant::DrawSubsector || variant == TriDrawVariant::FillSubsector || variant == TriDrawVariant::FuzzSubsector)
{
covered = covered && subsectorbuffer[ix].load(true) >= subsectorDepth;
}
SSAIfBlock branch;
branch.if_block(covered);
{
if (variant == TriDrawVariant::Stencil)
{
StencilBlock[ix + iy * 8].store(stencilWriteValue);
}
else if (variant == TriDrawVariant::StencilClose)
{
StencilBlock[ix + iy * 8].store(stencilWriteValue);
subsectorbuffer[ix].store(subsectorDepth);
}
else
{
SSAUBytePtr buf = buffer[ix * pixelsize];
if (truecolor)
{
SSAVec4i bg = buf.load_vec4ub(false);
buf.store_vec4ub(ProcessPixel32(bg, AffineVaryingPosX));
}
else
{
SSAUByte bg = buf.load(false);
buf.store(ProcessPixel8(bg.zext_int(), AffineVaryingPosX).trunc_ubyte());
}
if (variant != TriDrawVariant::DrawSubsector && variant != TriDrawVariant::FillSubsector && variant != TriDrawVariant::FuzzSubsector)
subsectorbuffer[ix].store(subsectorDepth);
}
}
branch.end_block();
if (variant == TriDrawVariant::Stencil || variant == TriDrawVariant::StencilClose)
{
SSAUByte newStencilValue = StencilBlock[ix + iy * 8].load(false);
stack_stencilblock_restored.store(stencilblock_restored && newStencilValue == lastStencilValue);
stack_stencilblock_lastval.store(newStencilValue);
}
for (int i = 0; i < TriVertex::NumVarying; i++)
stack_AffineVaryingPosX[i].store(AffineVaryingPosX[i] + AffineVaryingStepX[i]);
stack_CX1.store(CX1 - FDY12);
stack_CX2.store(CX2 - FDY23);
stack_CX3.store(CX3 - FDY31);
stack_ix.store(ix + 1);
}
loopx.end_block();
stack_AffineW.store(AffineW + gradWY);
for (int i = 0; i < TriVertex::NumVarying; i++)
stack_AffineVaryingPosY[i].store(AffineVaryingPosY[i] + gradVaryingY[i]);
stack_CY1.store(CY1 + FDX12);
stack_CY2.store(CY2 + FDX23);
stack_CY3.store(CY3 + FDX31);
stack_buffer.store(buffer[pitch * pixelsize]);
stack_subsectorbuffer.store(subsectorbuffer[pitch]);
stack_iy.store(iy + 1);
}
loopy.end_block();
if (variant == TriDrawVariant::Stencil || variant == TriDrawVariant::StencilClose)
{
SSAIfBlock branch;
SSABool restored = stack_stencilblock_restored.load();
branch.if_block(restored);
{
SSAUByte lastStencilValue = stack_stencilblock_lastval.load();
StencilClear(lastStencilValue);
}
branch.end_block();
}
*/
}
void SetupTriangleCodegen::SetStencilBlock(SSAInt block)
{
StencilBlock = stencilValues[block * 64];
StencilBlockMask = stencilMasks[block];
}
SSAUByte SetupTriangleCodegen::StencilGetSingle()
{
return StencilBlockMask.load(false).trunc_ubyte();
}
void SetupTriangleCodegen::StencilClear(SSAUByte value)
{
StencilBlockMask.store(SSAInt(0xffffff00) | value.zext_int());
}
SSABool SetupTriangleCodegen::StencilIsSingleValue()
{
return (StencilBlockMask.load(false) & SSAInt(0xffffff00)) == SSAInt(0xffffff00);
}
void SetupTriangleCodegen::LoadArgs(SSAValue args, SSAValue thread_data)
{
pitch = args[0][1].load(true);
v1 = LoadTriVertex(args[0][2].load(true));
v2 = LoadTriVertex(args[0][3].load(true));
v3 = LoadTriVertex(args[0][4].load(true));
clipright = args[0][6].load(true);
clipbottom = args[0][8].load(true);
stencilValues = args[0][14].load(true);
stencilMasks = args[0][15].load(true);
stencilPitch = args[0][16].load(true);
stencilTestValue = args[0][17].load(true);
stencilWriteValue = args[0][18].load(true);
subsectorGBuffer = args[0][19].load(true);
thread.core = thread_data[0][0].load(true);
thread.num_cores = thread_data[0][1].load(true);
thread.pass_start_y = SSAInt(0);
thread.pass_end_y = SSAInt(32000);
}
SSASetupVertex SetupTriangleCodegen::LoadTriVertex(SSAValue ptr)
{
SSASetupVertex v;
v.x = ptr[0][0].load(true);
v.y = ptr[0][1].load(true);
v.z = ptr[0][2].load(true);
v.w = ptr[0][3].load(true);
return v;
}