Pack texelFetch LOD as sampling coordinate's w component.

One less argument is emitted.

Vertex/PixelProgram sampleTexture function signature simplified.

Change-Id: I7aef3eb100ccb51a8bd9d5fd600c73b4843d30d9
Reviewed-on: https://swiftshader-review.googlesource.com/5600
Tested-by: Meng-Lin Wu <marleymoo@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <capn@google.com>
diff --git a/src/Shader/PixelProgram.cpp b/src/Shader/PixelProgram.cpp
index 3048ad1..d3e688c 100644
--- a/src/Shader/PixelProgram.cpp
+++ b/src/Shader/PixelProgram.cpp
@@ -287,8 +287,8 @@
 			case Shader::OPCODE_TEXKILL:    TEXKILL(cMask, d, dst.mask);                   break;
 			case Shader::OPCODE_TEXOFFSET:  TEXOFFSET(d, s0, src1, s2, project, bias);     break;
 			case Shader::OPCODE_TEXLDLOFFSET: TEXLDL(d, s0, src1, s2, project, bias);      break;
-			case Shader::OPCODE_TEXELFETCH: TEXELFETCH(d, s0, src1, s2);                   break;
-			case Shader::OPCODE_TEXELFETCHOFFSET: TEXELFETCH(d, s0, src1, s2, s3);         break;
+			case Shader::OPCODE_TEXELFETCH: TEXELFETCH(d, s0, src1);                       break;
+			case Shader::OPCODE_TEXELFETCHOFFSET: TEXELFETCH(d, s0, src1, s2);             break;
 			case Shader::OPCODE_TEXGRAD:    TEXGRAD(d, s0, src1, s2, s3);                  break;
 			case Shader::OPCODE_TEXGRADOFFSET: TEXGRAD(d, s0, src1, s2, s3, s4);           break;
 			case Shader::OPCODE_DISCARD:    DISCARD(cMask, instruction);                   break;
@@ -676,13 +676,13 @@
 		}
 	}
 
-	void PixelProgram::sampleTexture(Vector4f &c, const Src &sampler, Float4 &u, Float4 &v, Float4 &w, Float4 &q, Vector4f &dsx, Vector4f &dsy, Vector4f &offset, SamplerMethod method, unsigned int options)
+	void PixelProgram::sampleTexture(Vector4f &c, const Src &sampler, Vector4f &uvwq, Vector4f &dsx, Vector4f &dsy, Vector4f &offset, SamplerMethod method, unsigned int options)
 	{
 		Vector4f tmp;
 
 		if(sampler.type == Shader::PARAMETER_SAMPLER && sampler.rel.type == Shader::PARAMETER_VOID)
 		{
-			sampleTexture(tmp, sampler.index, u, v, w, q, dsx, dsy, offset, method, options);
+			sampleTexture(tmp, sampler.index, uvwq, dsx, dsy, offset, method, options);
 		}
 		else
 		{
@@ -694,7 +694,7 @@
 				{
 					If(index == i)
 					{
-						sampleTexture(tmp, i, u, v, w, q, dsx, dsy, offset, method, options);
+						sampleTexture(tmp, i, uvwq, dsx, dsy, offset, method, options);
 						// FIXME: When the sampler states are the same, we could use one sampler and just index the texture
 					}
 				}
@@ -707,7 +707,7 @@
 		c.w = tmp[(sampler.swizzle >> 6) & 0x3];
 	}
 
-	void PixelProgram::sampleTexture(Vector4f &c, int samplerIndex, Float4 &u, Float4 &v, Float4 &w, Float4 &q, Vector4f &dsx, Vector4f &dsy, Vector4f &offset, SamplerMethod method, unsigned int options)
+	void PixelProgram::sampleTexture(Vector4f &c, int samplerIndex, Vector4f &uvwq, Vector4f &dsx, Vector4f &dsy, Vector4f &offset, SamplerMethod method, unsigned int options)
 	{
 		#if PERF_PROFILE
 			Long texTime = Ticks();
@@ -717,17 +717,17 @@
 
 		if(!(options & Project))
 		{
-			sampler[samplerIndex]->sampleTexture(texture, c, u, v, w, q, dsx, dsy, offset, options, method);
+			sampler[samplerIndex]->sampleTexture(texture, c, uvwq.x, uvwq.y, uvwq.z, uvwq.w, dsx, dsy, offset, options, method);
 		}
 		else
 		{
-			Float4 rq = reciprocal(q);
+			Float4 rq = reciprocal(uvwq.w);
 
-			Float4 u_q = u * rq;
-			Float4 v_q = v * rq;
-			Float4 w_q = w * rq;
+			Float4 u_q = uvwq.x * rq;
+			Float4 v_q = uvwq.y * rq;
+			Float4 w_q = uvwq.z * rq;
 
-			sampler[samplerIndex]->sampleTexture(texture, c, u_q, v_q, w_q, q, dsx, dsy, offset, options, method);
+			sampler[samplerIndex]->sampleTexture(texture, c, u_q, v_q, w_q, uvwq.w, dsx, dsy, offset, options, method);
 		}
 
 		#if PERF_PROFILE
@@ -1109,49 +1109,47 @@
 
 	void PixelProgram::TEXLD(Vector4f &dst, Vector4f &src0, const Src &src1, bool project, bool bias)
 	{
-		sampleTexture(dst, src1, src0.x, src0.y, src0.z, src0.w, src0, src0, src0, bias ? Bias : Implicit, project ? Project : None);
+		sampleTexture(dst, src1, src0, src0, src0, src0, bias ? Bias : Implicit, project ? Project : None);
 	}
 
 	void PixelProgram::TEXOFFSET(Vector4f &dst, Vector4f &src0, const Src &src1, Vector4f &src2, bool project, bool bias)
 	{
-		sampleTexture(dst, src1, src0.x, src0.y, src0.z, src0.w, src0, src0, src2, bias ? Bias : Implicit, project ? (Project | Offset) : Offset);
+		sampleTexture(dst, src1, src0, src0, src0, src2, bias ? Bias : Implicit, project ? (Project | Offset) : Offset);
 	}
 
 	void PixelProgram::TEXLDL(Vector4f &dst, Vector4f &src0, const Src &src1, Vector4f &offset, bool project, bool bias)
 	{
-		sampleTexture(dst, src1, src0.x, src0.y, src0.z, src0.w, src0, src0, offset, Lod, project ? (Project | Offset) : Offset);
+		sampleTexture(dst, src1, src0, src0, src0, offset, Lod, project ? (Project | Offset) : Offset);
 	}
 
-	void PixelProgram::TEXELFETCH(Vector4f &dst, Vector4f &src0, const Src& src1, Vector4f &src2)
+	void PixelProgram::TEXELFETCH(Vector4f &dst, Vector4f &src0, const Src& src1)
 	{
-		Float4 lod(As<Int4>(src2.x));
-		sampleTexture(dst, src1, src0.x, src0.y, src0.z, lod, src0, src0, src0, Lod, Fetch);
+		sampleTexture(dst, src1, src0, src0, src0, src0, Lod, Fetch);
 	}
 
-	void PixelProgram::TEXELFETCH(Vector4f &dst, Vector4f &src0, const Src& src1, Vector4f &src2, Vector4f &offset)
+	void PixelProgram::TEXELFETCH(Vector4f &dst, Vector4f &src0, const Src& src1, Vector4f &offset)
 	{
-		Float4 lod(As<Int4>(src2.x));
-		sampleTexture(dst, src1, src0.x, src0.y, src0.z, lod, src0, src0, offset, Lod, Fetch | Offset);
+		sampleTexture(dst, src1, src0, src0, src0, offset, Lod, Fetch | Offset);
 	}
 
 	void PixelProgram::TEXGRAD(Vector4f &dst, Vector4f &src0, const Src& src1, Vector4f &src2, Vector4f &src3)
 	{
-		sampleTexture(dst, src1, src0.x, src0.y, src0.z, src0.w, src2, src3, src0, Grad, None);
+		sampleTexture(dst, src1, src0, src2, src3, src0, Grad, None);
 	}
 
 	void PixelProgram::TEXGRAD(Vector4f &dst, Vector4f &src0, const Src& src1, Vector4f &src2, Vector4f &src3, Vector4f &offset)
 	{
-		sampleTexture(dst, src1, src0.x, src0.y, src0.z, src0.w, src2, src3, offset, Grad, Offset);
+		sampleTexture(dst, src1, src0, src2, src3, offset, Grad, Offset);
 	}
 
 	void PixelProgram::TEXLDD(Vector4f &dst, Vector4f &src0, const Src &src1, Vector4f &src2, Vector4f &src3, bool project)
 	{
-		sampleTexture(dst, src1, src0.x, src0.y, src0.z, src0.w, src2, src3, src0, Grad, project ? Project : None);
+		sampleTexture(dst, src1, src0, src2, src3, src0, Grad, project ? Project : None);
 	}
 
 	void PixelProgram::TEXLDL(Vector4f &dst, Vector4f &src0, const Src &src1, bool project)
 	{
-		sampleTexture(dst, src1, src0.x, src0.y, src0.z, src0.w, src0, src0, src0, Lod, project ? Project : None);
+		sampleTexture(dst, src1, src0, src0, src0, src0, Lod, project ? Project : None);
 	}
 
 	void PixelProgram::TEXSIZE(Vector4f &dst, Float4 &lod, const Src &src1)