Add texture tri-linear autodiff example. (#2715)

* Add quad texture example.

* delete output image

* remove irrelavent files

* update project files

* fix

* Update example.

* Fix.

* remove out-texture

---------

Co-authored-by: Yong He <yhe@nvidia.com>

1 files changed, 52 insertions, 0 deletions

diff --git a/examples/autodiff-texture/draw-quad.slang b/examples/autodiff-texture/draw-quad.slang
new file mode 100644
index 000000000..55a33b46b
--- /dev/null
+++ b/examples/autodiff-texture/draw-quad.slang
@@ -0,0 +1,52 @@
+// Vertex and fragment shader to draw a textured quad on screen.
+
+cbuffer Uniforms
+{
+    int x;
+    int y;
+    int width;
+    int height;
+    int viewWidth;
+    int viewHeight;
+    Texture2D texture;
+    SamplerState sampler;
+}
+
+struct AssembledVertex
+{
+    float3	position : POSITION;
+};
+
+struct Fragment
+{
+    float4 color;
+};
+
+struct VertexStageOutput
+{
+    float2 uv : UV;
+    float4          sv_position     : SV_Position;
+};
+
+[shader("vertex")]
+VertexStageOutput vertexMain(
+    AssembledVertex assembledVertex)
+{
+    VertexStageOutput output;
+
+    float3 position = assembledVertex.position;
+
+    output.uv = position.xy;
+    output.sv_position.x = (x + position.x * width) / (float)viewWidth * 2.0f - 1.0f;
+    output.sv_position.y = -((y + position.y * height) / (float)viewHeight * 2.0f - 1.0f);
+    output.sv_position.z = 0.5;
+    output.sv_position.w = 1.0;
+    return output;
+}
+
+[shader("fragment")]
+float4 fragmentMain(
+    float2 uv : UV) : SV_Target
+{
+    return float4(texture.Sample(sampler, uv).xyz, 1.0);
+}