/*
**  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 "i_system.h"
#include "r_compiler/llvm_include.h"
#include "r_compiler/fixedfunction/drawtrianglecodegen.h"
#include "r_compiler/ssa/ssa_function.h"
#include "r_compiler/ssa/ssa_scope.h"
#include "r_compiler/ssa/ssa_for_block.h"
#include "r_compiler/ssa/ssa_if_block.h"
#include "r_compiler/ssa/ssa_stack.h"
#include "r_compiler/ssa/ssa_function.h"
#include "r_compiler/ssa/ssa_struct_type.h"
#include "r_compiler/ssa/ssa_value.h"

void DrawTriangleCodegen::Generate(TriDrawVariant variant, bool truecolor, SSAValue args, SSAValue thread_data)
{
	LoadArgs(variant, truecolor, args, thread_data);
	Setup(variant, truecolor);
	LoopBlockY(variant, truecolor);
}

void DrawTriangleCodegen::Setup(TriDrawVariant variant, bool truecolor)
{
	int pixelsize = truecolor ? 4 : 1;

	// 28.4 fixed-point coordinates
	Y1 = SSAInt(SSAFloat::round(16.0f * v1.y), false);
	Y2 = SSAInt(SSAFloat::round(16.0f * v2.y), false);
	Y3 = SSAInt(SSAFloat::round(16.0f * v3.y), false);

	X1 = SSAInt(SSAFloat::round(16.0f * v1.x), false);
	X2 = SSAInt(SSAFloat::round(16.0f * v2.x), false);
	X3 = SSAInt(SSAFloat::round(16.0f * v3.x), false);

	// 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) >> 4, clipleft);
	maxx = SSAInt::MIN((SSAInt::MAX(SSAInt::MAX(X1, X2), X3) + 0xF) >> 4, clipright - 1);
	miny = SSAInt::MAX((SSAInt::MIN(SSAInt::MIN(Y1, Y2), Y3) + 0xF) >> 4, cliptop);
	maxy = SSAInt::MIN((SSAInt::MAX(SSAInt::MAX(Y1, Y2), Y3) + 0xF) >> 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);

	dest = dest[miny * pitch * pixelsize];
	subsectorGBuffer = subsectorGBuffer[miny * pitch];

	// 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();

	// Gradients
	gradWX = gradx(v1.x, v1.y, v2.x, v2.y, v3.x, v3.y, v1.w, v2.w, v3.w);
	gradWY = grady(v1.x, v1.y, v2.x, v2.y, v3.x, v3.y, v1.w, v2.w, v3.w);
	startW = v1.w + gradWX * (SSAFloat(minx) - v1.x) + gradWY * (SSAFloat(miny) - v1.y);
	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] * (SSAFloat(minx) - v1.x) + gradVaryingY[i] * (SSAFloat(miny) - v1.y);
	}
}

SSAFloat DrawTriangleCodegen::gradx(SSAFloat x0, SSAFloat y0, SSAFloat x1, SSAFloat y1, SSAFloat x2, SSAFloat y2, SSAFloat c0, SSAFloat c1, SSAFloat c2)
{
	SSAFloat top = (c1 - c2) * (y0 - y2) - (c0 - c2) * (y1 - y2);
	SSAFloat bottom = (x1 - x2) * (y0 - y2) - (x0 - x2) * (y1 - y2);
	return top / bottom;
}

SSAFloat DrawTriangleCodegen::grady(SSAFloat x0, SSAFloat y0, SSAFloat x1, SSAFloat y1, SSAFloat x2, SSAFloat y2, SSAFloat c0, SSAFloat c1, SSAFloat c2)
{
	SSAFloat top = (c1 - c2) * (x0 - x2) - (c0 - c2) * (x1 - x2);
	SSAFloat bottom = (x0 - x2) * (y1 - y2) - (x1 - x2) * (y0 - y2);
	return top / bottom;
}

void DrawTriangleCodegen::LoopBlockY(TriDrawVariant variant, bool truecolor)
{
	int pixelsize = truecolor ? 4 : 1;

	stack_y.store(miny);
	stack_dest.store(dest);
	stack_subsectorGBuffer.store(subsectorGBuffer);

	SSAForBlock loop;
	y = stack_y.load();
	dest = stack_dest.load();
	subsectorGBuffer = stack_subsectorGBuffer.load();
	loop.loop_block(y < maxy, 0);
	{
		SSAIfBlock branch;
		branch.if_block((y / q) % thread.num_cores == thread.core);
		{
			LoopBlockX(variant, truecolor);
		}
		branch.end_block();

		stack_dest.store(dest[q * pitch * pixelsize]);
		stack_subsectorGBuffer.store(subsectorGBuffer[q * pitch]);
		stack_y.store(y + q);
	}
	loop.end_block();
}

void DrawTriangleCodegen::LoopBlockX(TriDrawVariant variant, bool truecolor)
{
	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
		SSAIfBlock branch;
		branch.if_block(!(a == SSAInt(0) || b == SSAInt(0) || c == SSAInt(0)));

		// Check if block needs clipping
		SSABool clipneeded = clipleft > x || clipright < (x + q) || cliptop > y || clipbottom < (y + q);

		// Calculate varying variables for affine block
		SSAFloat offx0 = SSAFloat(x - minx) + 0.5f;
		SSAFloat offy0 = SSAFloat(y - miny) + 0.5f;
		SSAFloat offx1 = offx0 + SSAFloat(q);
		SSAFloat offy1 = offy0 + SSAFloat(q);
		SSAFloat rcpWTL = 1.0f / (startW + offx0 * gradWX + offy0 * gradWY);
		SSAFloat rcpWTR = 1.0f / (startW + offx1 * gradWX + offy0 * gradWY);
		SSAFloat rcpWBL = 1.0f / (startW + offx0 * gradWX + offy1 * gradWY);
		SSAFloat rcpWBR = 1.0f / (startW + offx1 * gradWX + offy1 * gradWY);
		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);
		}

		SSAFloat globVis = SSAFloat(1706.0f);
		SSAFloat vis = globVis / rcpWTL;
		SSAFloat shade = 64.0f - (SSAFloat(light * 255 / 256) + 12.0f) * 32.0f / 128.0f;
		SSAFloat lightscale = SSAFloat::clamp((shade - SSAFloat::MIN(SSAFloat(24.0f), vis)) / 32.0f, SSAFloat(0.0f), SSAFloat(31.0f / 32.0f));
		diminishedlight = SSAInt(SSAFloat::clamp((1.0f - lightscale) * 256.0f + 0.5f, SSAFloat(0.0f), SSAFloat(256.0f)), false);

		SetStencilBlock(x / 8 + y / 8 * stencilPitch);

		SSABool covered = a == SSAInt(0xF) && b == SSAInt(0xF) && c == SSAInt(0xF) && !clipneeded;
		if (variant != TriDrawVariant::DrawSubsector)
		{
			covered = covered && StencilIsSingleValue();
		}

		// Accept whole block when totally covered
		SSAIfBlock branch_covered;
		branch_covered.if_block(covered);
		{
			LoopFullBlock(variant, truecolor);
		}
		branch_covered.else_block();
		{
			LoopPartialBlock(variant, truecolor);
		}
		branch_covered.end_block();

		branch.end_block();

		stack_x.store(x + q);
	}
	loop.end_block();
}

void DrawTriangleCodegen::LoopFullBlock(TriDrawVariant variant, bool truecolor)
{
	SSAIfBlock branch_stenciltest;
	if (variant != TriDrawVariant::DrawSubsector)
	{
		branch_stenciltest.if_block(StencilGetSingle() == stencilTestValue);
	}

	if (variant == TriDrawVariant::Stencil)
	{
		StencilClear(stencilWriteValue);
	}
	else
	{
		int pixelsize = truecolor ? 4 : 1;

		stack_iy.store(SSAInt(0));
		stack_buffer.store(dest);
		stack_subsectorbuffer.store(subsectorGBuffer);

		SSAForBlock loopy;
		SSAInt iy = stack_iy.load();
		SSAUBytePtr buffer = stack_buffer.load();
		SSAIntPtr subsectorbuffer = stack_subsectorbuffer.load();
		loopy.loop_block(iy < SSAInt(q), q);
		{
			SSAInt varyingStep[TriVertex::NumVarying];
			for (int i = 0; i < TriVertex::NumVarying; i++)
			{
				SSAFloat pos = varyingTL[i] + varyingBL[i] * SSAFloat(iy);
				SSAFloat step = (varyingTR[i] + varyingBR[i] * SSAFloat(iy) - pos) * (1.0f / q);

				stack_varying[i].store(SSAInt((pos - SSAFloat::floor(pos)) * SSAFloat((float)0x100000000LL), true));
				varyingStep[i] = SSAInt(step * SSAFloat((float)0x100000000LL), true);
			}

			stack_ix.store(x);
			SSAForBlock loopx;
			SSAInt ix = stack_ix.load();
			SSAInt varying[TriVertex::NumVarying];
			for (int i = 0; i < TriVertex::NumVarying; i++)
				varying[i] = stack_varying[i].load();
			loopx.loop_block(ix < x + q, q);
			{
				if (variant == TriDrawVariant::DrawSubsector)
				{
					SSAIfBlock branch;
					branch.if_block(subsectorbuffer[ix].load(true) >= subsectorDepth);
					{
						if (truecolor)
							ProcessPixel(buffer[ix * 4], subsectorbuffer[ix], varying, variant, truecolor);
						else
							ProcessPixel(buffer[ix], subsectorbuffer[ix], varying, variant, truecolor);
					}
					branch.end_block();
				}
				else
				{
					if (truecolor)
						ProcessPixel(buffer[ix * 4], subsectorbuffer[ix], varying, variant, truecolor);
					else
						ProcessPixel(buffer[ix], subsectorbuffer[ix], varying, variant, truecolor);
				}

				for (int i = 0; i < TriVertex::NumVarying; i++)
					stack_varying[i].store(varying[i] + varyingStep[i]);

				stack_ix.store(ix + 1);
			}
			loopx.end_block();

			stack_buffer.store(buffer[pitch * pixelsize]);
			stack_subsectorbuffer.store(subsectorbuffer[pitch]);
			stack_iy.store(iy + 1);
		}
		loopy.end_block();
	}

	if (variant != TriDrawVariant::DrawSubsector)
	{
		branch_stenciltest.end_block();
	}
}

void DrawTriangleCodegen::LoopPartialBlock(TriDrawVariant variant, bool truecolor)
{
	int pixelsize = truecolor ? 4 : 1;

	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);
	stack_subsectorbuffer.store(subsectorGBuffer);

	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();
	loopy.loop_block(iy < SSAInt(q), q);
	{
		SSAInt varyingStep[TriVertex::NumVarying];
		for (int i = 0; i < TriVertex::NumVarying; i++)
		{
			SSAFloat pos = varyingTL[i] + varyingBL[i] * SSAFloat(iy);
			SSAFloat step = (varyingTR[i] + varyingBR[i] * SSAFloat(iy) - pos) * (1.0f / q);

			stack_varying[i].store(SSAInt((pos - SSAFloat::floor(pos)) * SSAFloat((float)0x100000000LL), true));
			varyingStep[i] = SSAInt(step * SSAFloat((float)0x100000000LL), true);
		}

		stack_CX1.store(CY1);
		stack_CX2.store(CY2);
		stack_CX3.store(CY3);
		stack_ix.store(SSAInt(0));

		SSAForBlock loopx;
		SSAInt ix = stack_ix.load();
		SSAInt CX1 = stack_CX1.load();
		SSAInt CX2 = stack_CX2.load();
		SSAInt CX3 = stack_CX3.load();
		SSAInt varying[TriVertex::NumVarying];
		for (int i = 0; i < TriVertex::NumVarying; i++)
			varying[i] = stack_varying[i].load();
		loopx.loop_block(ix < SSAInt(q), q);
		{
			SSABool visible = (ix + x >= clipleft) && (ix + x < clipright) && (cliptop <= y + iy) && (clipbottom > y + iy);
			SSABool covered = CX1 > SSAInt(0) && CX2 > SSAInt(0) && CX3 > SSAInt(0) && visible;

			if (variant == TriDrawVariant::DrawSubsector)
			{
				covered = covered && subsectorbuffer[ix + x].load(true) >= subsectorDepth;
			}
			else
			{
				covered = covered && StencilGet(ix, iy) == stencilTestValue;
			}

			SSAIfBlock branch;
			branch.if_block(covered);
			{
				if (variant == TriDrawVariant::Stencil)
				{
					StencilSet(ix, iy, stencilWriteValue);
				}
				else
				{
					if (truecolor)
						ProcessPixel(buffer[(ix + x) * 4], subsectorbuffer[ix + x], varying, variant, truecolor);
					else
						ProcessPixel(buffer[ix + x], subsectorbuffer[ix + x], varying, variant, truecolor);
				}
			}
			branch.end_block();

			for (int i = 0; i < TriVertex::NumVarying; i++)
				stack_varying[i].store(varying[i] + varyingStep[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_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();
}

void DrawTriangleCodegen::ProcessPixel(SSAUBytePtr buffer, SSAIntPtr subsectorbuffer, SSAInt *varying, TriDrawVariant variant, bool truecolor)
{
	if (variant == TriDrawVariant::Fill)
	{
		if (truecolor)
		{
			buffer.store_vec4ub(SSAVec4i::unpack(solidcolor));
		}
		else
		{
			//buffer.store(solidcolor);
		}
		subsectorbuffer.store(subsectorDepth);
	}
	else
	{
		SSAInt ufrac = varying[0];
		SSAInt vfrac = varying[1];

		SSAInt upos = ((ufrac >> 16) * textureWidth) >> 16;
		SSAInt vpos = ((vfrac >> 16) * textureHeight) >> 16;
		SSAInt uvoffset = upos * textureHeight + vpos;

		if (truecolor)
		{
			SSAVec4i fg = texturePixels[uvoffset * 4].load_vec4ub(true);
			SSAInt fg_alpha = fg[3];
			fg = (fg * diminishedlight) >> 8;
			fg.insert(3, fg_alpha);

			if (variant == TriDrawVariant::DrawMasked || variant == TriDrawVariant::DrawSubsector)
			{
				SSAIfBlock branch_transparency;
				branch_transparency.if_block(fg_alpha > SSAInt(127));
				{
					buffer.store_vec4ub(fg);
					if (variant != TriDrawVariant::DrawSubsector)
						subsectorbuffer.store(subsectorDepth);
				}
				branch_transparency.end_block();
			}
			else
			{
				buffer.store_vec4ub(fg);
				subsectorbuffer.store(subsectorDepth);
			}
		}
		else
		{
			SSAUByte palindex = texturePixels[uvoffset].load(true);

			if (variant == TriDrawVariant::DrawMasked || variant == TriDrawVariant::DrawSubsector)
			{
				SSAIfBlock branch_transparency;
				branch_transparency.if_block(!(palindex.zext_int() == SSAInt(0)));
				{
					buffer.store(palindex);
					if (variant != TriDrawVariant::DrawSubsector)
						subsectorbuffer.store(subsectorDepth);
				}
				branch_transparency.end_block();
			}
			else
			{
				buffer.store(palindex);
				subsectorbuffer.store(subsectorDepth);
			}
		}
	}
}

void DrawTriangleCodegen::SetStencilBlock(SSAInt block)
{
	StencilBlock = stencilValues[block * 64];
	StencilBlockMask = stencilMasks[block];
}

void DrawTriangleCodegen::StencilSet(SSAInt x, SSAInt y, SSAUByte value)
{
	SSAInt mask = StencilBlockMask.load(false);

	SSAIfBlock branchNeedsUpdate;
	branchNeedsUpdate.if_block(!(mask == SSAInt(0xffffffff) && StencilBlock[0].load(false) == value));

	SSAIfBlock branchFirstSet;
	branchFirstSet.if_block(mask == SSAInt(0xffffffff));
	{
		SSAUByte val0 = StencilBlock[0].load(false);
		for (int i = 1; i < 8 * 8; i++)
			StencilBlock[i].store(val0);
	}
	branchFirstSet.end_block();

	SSAIfBlock branchNeedsUpdate2;
	branchNeedsUpdate2.if_block(!(StencilBlock[x + y * 8].load(false) == value));

	StencilBlock[x + y * 8].store(value);

	SSAInt leveloffset = SSAInt(0);
	for (int i = 1; i < 4; i++)
	{
		x = x >> 1;
		y = y >> 1;

		SSABool differs =
			!(StencilBlock[(x << i) + (y << i) * 8].load(false) == value &&
			StencilBlock[((x + 1) << i) + (y << i) * 8].load(false) == value &&
			StencilBlock[(x << i) + ((y + 1) << i) * 8].load(false) == value &&
			StencilBlock[((x + 1) << i) + ((y + 1) << i) * 8].load(false) == value);

		SSAInt levelbit = SSAInt(1) << (leveloffset + x + y * (8 >> i));

		mask = differs.select(mask & ~levelbit, mask | levelbit);

		leveloffset = leveloffset + (SSAInt(8) >> leveloffset) * (SSAInt(8) >> leveloffset);
	}

	SSABool differs = 
		!(StencilBlock[0].load(false) == value &&
		StencilBlock[4].load(false) == value &&
		StencilBlock[4 * 8].load(false) == value &&
		StencilBlock[4 * 8 + 4].load(false) == value);

	mask = differs.select(mask & ~(1 << 22), mask | (1 << 22));

	StencilBlockMask.store(mask);

	branchNeedsUpdate2.end_block();
	branchNeedsUpdate.end_block();
}

SSAUByte DrawTriangleCodegen::StencilGet(SSAInt x, SSAInt y)
{
	SSABool oneValueBlock = StencilBlockMask.load(false) == SSAInt(0xffffffff);
	return oneValueBlock.select(StencilBlock[0].load(false), StencilBlock[x + y * 8].load(false));
}

SSAUByte DrawTriangleCodegen::StencilGetSingle()
{
	return StencilBlock[0].load(false);
}

void DrawTriangleCodegen::StencilClear(SSAUByte value)
{
	StencilBlock[0].store(value);
	StencilBlockMask.store(SSAInt(0xffffffff));
}

SSABool DrawTriangleCodegen::StencilIsSingleValue()
{
	return StencilBlockMask.load(false) == SSAInt(0xffffffff);
}

void DrawTriangleCodegen::LoadArgs(TriDrawVariant variant, bool truecolor, SSAValue args, SSAValue thread_data)
{
	dest = args[0][0].load(true);
	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));
	clipleft = args[0][5].load(true);
	clipright = args[0][6].load(true);
	cliptop = args[0][7].load(true);
	clipbottom = args[0][8].load(true);
	texturePixels = args[0][9].load(true);
	textureWidth = args[0][10].load(true);
	textureHeight = args[0][11].load(true);
	solidcolor = args[0][12].load(true);
	LoadUniforms(args[0][13].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);
}

SSATriVertex DrawTriangleCodegen::LoadTriVertex(SSAValue ptr)
{
	SSATriVertex 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);
	for (int i = 0; i < TriVertex::NumVarying; i++)
		v.varying[i] = ptr[0][4 + i].load(true);
	return v;
}

void DrawTriangleCodegen::LoadUniforms(SSAValue uniforms)
{
	light = uniforms[0][0].load(true);
	subsectorDepth = uniforms[0][1].load(true);

	SSAShort light_alpha = uniforms[0][2].load(true);
	SSAShort light_red = uniforms[0][3].load(true);
	SSAShort light_green = uniforms[0][4].load(true);
	SSAShort light_blue = uniforms[0][5].load(true);
	SSAShort fade_alpha = uniforms[0][6].load(true);
	SSAShort fade_red = uniforms[0][7].load(true);
	SSAShort fade_green = uniforms[0][8].load(true);
	SSAShort fade_blue = uniforms[0][9].load(true);
	SSAShort desaturate = uniforms[0][10].load(true);
	SSAInt flags = uniforms[0][11].load(true);
	shade_constants.light = SSAVec4i(light_blue.zext_int(), light_green.zext_int(), light_red.zext_int(), light_alpha.zext_int());
	shade_constants.fade = SSAVec4i(fade_blue.zext_int(), fade_green.zext_int(), fade_red.zext_int(), fade_alpha.zext_int());
	shade_constants.desaturate = desaturate.zext_int();

	is_simple_shade = (flags & TriUniforms::simple_shade) == SSAInt(TriUniforms::simple_shade);
	is_nearest_filter = (flags & TriUniforms::nearest_filter) == SSAInt(TriUniforms::nearest_filter);
}