Remove some GL/D3D legacy format quirks from vulkan vertex buffers

- Fix mapping of B8G8R8A8 -- this is the same as the old D3DCOLOR.
- Remove all the other stream types that don't match anything in Vulkan.
- Remove unused resource pointer in stream

There is still future cleanup work to do here -- we should be able to
do vertex fetch purely based on the VkFormat rather than mapping it onto
the GL model.

Change-Id: Ia100ec68e8930acd17b6cba35a27403b4ef8e883
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/25768
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Tested-by: Chris Forbes <chrisforbes@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>

src/Device/Stream.hpp

diff --git a/src/Device/Stream.hpp b/src/Device/Stream.hpp
index 31a80ab..54841e3 100644
--- a/src/Device/Stream.hpp
+++ b/src/Device/Stream.hpp
@@ -19,14 +19,9 @@
 
 namespace sw
 {
-	class Resource;
-
 	enum StreamType ENUM_UNDERLYING_TYPE_UNSIGNED_INT
 	{
 		STREAMTYPE_COLOR,     // 4 normalized unsigned bytes, ZYXW order
-		STREAMTYPE_UDEC3,     // 3 unsigned 10-bit fields
-		STREAMTYPE_DEC3N,     // 3 normalized signed 10-bit fields
-		STREAMTYPE_INDICES,   // 4 unsigned bytes, stored unconverted into X component
 		STREAMTYPE_FLOAT,     // Normalization ignored
 		STREAMTYPE_BYTE,
 		STREAMTYPE_SBYTE,
@@ -34,7 +29,6 @@
 		STREAMTYPE_USHORT,
 		STREAMTYPE_INT,
 		STREAMTYPE_UINT,
-		STREAMTYPE_FIXED,     // Normalization ignored (16.16 format)
 		STREAMTYPE_HALF,      // Normalization ignored
 		STREAMTYPE_2_10_10_10_INT,
 		STREAMTYPE_2_10_10_10_UINT,
@@ -44,16 +38,14 @@
 
 	struct StreamResource
 	{
-		Resource *resource;
 		const void *buffer;
 		unsigned int stride;
 	};
 
 	struct Stream : public StreamResource
 	{
-		Stream(Resource *resource = 0, const void *buffer = 0, unsigned int stride = 0)
+		Stream(const void *buffer = nullptr, unsigned int stride = 0)
 		{
-			this->resource = resource;
 			this->buffer = buffer;
 			this->stride = stride;
 		}
@@ -81,7 +73,6 @@
 		{
 			static const float4 null = {0, 0, 0, 1};
 
-			resource = 0;
 			buffer = &null;
 			stride = 0;
 			type = STREAMTYPE_FLOAT;

src/Pipeline/VertexRoutine.cpp

diff --git a/src/Pipeline/VertexRoutine.cpp b/src/Pipeline/VertexRoutine.cpp
index 803c24d..c4e5db5 100644
--- a/src/Pipeline/VertexRoutine.cpp
+++ b/src/Pipeline/VertexRoutine.cpp
@@ -376,115 +376,6 @@
 				transpose4xN(v.x, v.y, v.z, v.w, stream.count);
 			}
 			break;
-		case STREAMTYPE_UDEC3:
-			{
-				// FIXME: Vectorize
-				{
-					Int x, y, z;
-
-					x = y = z = *Pointer<Int>(source0);
-
-					v.x.x = Float(x & 0x000003FF);
-					v.x.y = Float(y & 0x000FFC00);
-					v.x.z = Float(z & 0x3FF00000);
-				}
-
-				{
-					Int x, y, z;
-
-					x = y = z = *Pointer<Int>(source1);
-
-					v.y.x = Float(x & 0x000003FF);
-					v.y.y = Float(y & 0x000FFC00);
-					v.y.z = Float(z & 0x3FF00000);
-				}
-
-				{
-					Int x, y, z;
-
-					x = y = z = *Pointer<Int>(source2);
-
-					v.z.x = Float(x & 0x000003FF);
-					v.z.y = Float(y & 0x000FFC00);
-					v.z.z = Float(z & 0x3FF00000);
-				}
-
-				{
-					Int x, y, z;
-
-					x = y = z = *Pointer<Int>(source3);
-
-					v.w.x = Float(x & 0x000003FF);
-					v.w.y = Float(y & 0x000FFC00);
-					v.w.z = Float(z & 0x3FF00000);
-				}
-
-				transpose4x3(v.x, v.y, v.z, v.w);
-
-				v.y *= Float4(1.0f / 0x00000400);
-				v.z *= Float4(1.0f / 0x00100000);
-			}
-			break;
-		case STREAMTYPE_DEC3N:
-			{
-				// FIXME: Vectorize
-				{
-					Int x, y, z;
-
-					x = y = z = *Pointer<Int>(source0);
-
-					v.x.x = Float((x << 22) & 0xFFC00000);
-					v.x.y = Float((y << 12) & 0xFFC00000);
-					v.x.z = Float((z << 2)  & 0xFFC00000);
-				}
-
-				{
-					Int x, y, z;
-
-					x = y = z = *Pointer<Int>(source1);
-
-					v.y.x = Float((x << 22) & 0xFFC00000);
-					v.y.y = Float((y << 12) & 0xFFC00000);
-					v.y.z = Float((z << 2)  & 0xFFC00000);
-				}
-
-				{
-					Int x, y, z;
-
-					x = y = z = *Pointer<Int>(source2);
-
-					v.z.x = Float((x << 22) & 0xFFC00000);
-					v.z.y = Float((y << 12) & 0xFFC00000);
-					v.z.z = Float((z << 2)  & 0xFFC00000);
-				}
-
-				{
-					Int x, y, z;
-
-					x = y = z = *Pointer<Int>(source3);
-
-					v.w.x = Float((x << 22) & 0xFFC00000);
-					v.w.y = Float((y << 12) & 0xFFC00000);
-					v.w.z = Float((z << 2)  & 0xFFC00000);
-				}
-
-				transpose4x3(v.x, v.y, v.z, v.w);
-
-				v.x *= Float4(1.0f / 0x00400000 / 511.0f);
-				v.y *= Float4(1.0f / 0x00400000 / 511.0f);
-				v.z *= Float4(1.0f / 0x00400000 / 511.0f);
-			}
-			break;
-		case STREAMTYPE_FIXED:
-			{
-				v.x = Float4(*Pointer<Int4>(source0)) * *Pointer<Float4>(constants + OFFSET(Constants,unscaleFixed));
-				v.y = Float4(*Pointer<Int4>(source1)) * *Pointer<Float4>(constants + OFFSET(Constants,unscaleFixed));
-				v.z = Float4(*Pointer<Int4>(source2)) * *Pointer<Float4>(constants + OFFSET(Constants,unscaleFixed));
-				v.w = Float4(*Pointer<Int4>(source3)) * *Pointer<Float4>(constants + OFFSET(Constants,unscaleFixed));
-
-				transpose4xN(v.x, v.y, v.z, v.w, stream.count);
-			}
-			break;
 		case STREAMTYPE_HALF:
 			{
 				if(stream.count >= 1)
@@ -540,14 +431,6 @@
 				}
 			}
 			break;
-		case STREAMTYPE_INDICES:
-			{
-				v.x.x = *Pointer<Float>(source0);
-				v.x.y = *Pointer<Float>(source1);
-				v.x.z = *Pointer<Float>(source2);
-				v.x.w = *Pointer<Float>(source3);
-			}
-			break;
 		case STREAMTYPE_2_10_10_10_INT:
 			{
 				Int4 src;

src/Vulkan/VkPipeline.cpp

diff --git a/src/Vulkan/VkPipeline.cpp b/src/Vulkan/VkPipeline.cpp
index 556b6a2..b2eac40 100644
--- a/src/Vulkan/VkPipeline.cpp
+++ b/src/Vulkan/VkPipeline.cpp
@@ -70,10 +70,11 @@
 	case VK_FORMAT_R8_UINT:
 	case VK_FORMAT_R8G8_UINT:
 	case VK_FORMAT_R8G8B8A8_UINT:
-	case VK_FORMAT_B8G8R8A8_UNORM:
 	case VK_FORMAT_A8B8G8R8_UNORM_PACK32:
 	case VK_FORMAT_A8B8G8R8_UINT_PACK32:
 		return sw::STREAMTYPE_BYTE;
+	case VK_FORMAT_B8G8R8A8_UNORM:
+		return sw::STREAMTYPE_COLOR;
 	case VK_FORMAT_R8_SNORM:
 	case VK_FORMAT_R8_SINT:
 	case VK_FORMAT_R8G8_SNORM: