Hotfix/texture2d gather (#876)

* First pass test to see if GatherRed works.

* Add support for generating R_Float32 textures.

* Set default texture format.

* * Alter the texture2d-gather to work with a R_Float32 texture
* Add support for scalar Texture2d types with GatherXXX in stdlib

* Remove some left over commented out test code from texture2d-gather.hlsl

1 files changed, 44 insertions, 0 deletions

diff --git a/tests/bugs/texture2d-gather.hlsl b/tests/bugs/texture2d-gather.hlsl
new file mode 100644
index 000000000..3886472bd
--- /dev/null
+++ b/tests/bugs/texture2d-gather.hlsl
@@ -0,0 +1,44 @@
+//TEST(smoke):COMPARE_HLSL_RENDER:
+//TEST_INPUT: Texture2D(size=16, content=chessboard, format=R_Float32):dxbinding(0),glbinding(0)
+
+Texture2D<float> g_texture : register(t0);
+SamplerState g_sampler : register(s0);
+
+cbuffer Uniforms
+{
+	float4x4 modelViewProjection;
+}
+
+struct AssembledVertex
+{
+	float3	position;
+	float3	color;
+};
+
+// Vertex  Shader
+struct VertexStageInput
+{
+	AssembledVertex assembledVertex	: A;
+};
+
+struct VertexStageOutput
+{
+	float4          color           : COLOR; 
+	float4			position		: SV_Position;
+};
+
+VertexStageOutput vertexMain(VertexStageInput input) 
+{
+    VertexStageOutput output;
+    
+    output.position = mul(modelViewProjection, float4(input.assembledVertex.position, 1.0));
+    output.color = float4(input.assembledVertex.color, 1.0f);
+    
+    return output;
+}
+
+// Fragment Shader
+float4 fragmentMain(VertexStageOutput input) : SV_Target
+{
+    return g_texture.GatherRed(g_sampler, input.color.xy);
+}
\ No newline at end of file