Add a billboard and imposter sample.

The reference screenshot is in another CL


git-svn-id: svn://svn.chromium.org/chrome/trunk/src@20465 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 81 insertions, 0 deletions

diff --git a/o3d/samples/shaders/green-blue-checker.shader b/o3d/samples/shaders/green-blue-checker.shader
new file mode 100644
index 0000000..02b5296
--- /dev/null
+++ b/o3d/samples/shaders/green-blue-checker.shader
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+// @@REWRITE(insert shader-copyright)
+// The 4x4 world view projection matrix.
+float4x4 worldViewProjection : WORLDVIEWPROJECTION;
+float4x4 worldInverseTranspose : WORLDINVERSETRANSPOSE;
+float4x4 world : WORLD;
+
+// light position
+float3 lightWorldPos;
+float3 lightColor;
+
+// input parameters for our vertex shader
+struct VertexShaderInput {
+  float4 position : POSITION;
+  float4 normal : NORMAL;
+  float2 texcoord : TEXCOORD0;
+};
+
+// input parameters for our pixel shader
+struct PixelShaderInput {
+  float4 position : POSITION;
+  float2 texcoord : TEXCOORD0;
+  float3 normal : TEXCOORD1;
+  float3 worldPosition : TEXCOORD2;
+};
+
+// function for getting the checker pattern
+float4 checker(float2 uv) {
+  float checkSize = 10;
+  float fmodResult = fmod(floor(checkSize * uv.x) + floor(checkSize * uv.y),
+                          2.0);
+  return (fmodResult < 1) ?
+      float4(0.4, 0.5, 0.5, 1) :
+      float4(0.6, 0.8, 0.8, 1);
+}
+
+/**
+ * Our vertex shader. In the vertex shader, we calculate the lighting.
+ * Then we'll combine it with our checker pattern input the pixel shader.
+ */
+PixelShaderInput vertexShaderFunction(VertexShaderInput input) {
+  PixelShaderInput output;
+
+  // Transform position into clip space.
+  output.position = mul(input.position, worldViewProjection);
+
+  // Transform normal into world space, where we can do lighting
+  // calculations even if the world transform contains scaling.
+  output.normal = mul(input.normal, worldInverseTranspose).xyz;
+
+  // Calculate surface position in world space.
+  output.worldPosition = mul(input.position, world).xyz;
+
+  output.texcoord = input.texcoord;
+
+  return output;
+}
+
+/**
+ * Our pixel shader. We take the lighting color we got from the vertex sahder
+ * and combine it with our checker pattern. We only need to use the x
+ * coordinate of our input.col because we gave it uniform color
+ */
+float4 pixelShaderFunction(PixelShaderInput input): COLOR {
+  float3 surfaceToLight = normalize(lightWorldPos - input.worldPosition);
+
+  float3 worldNormal = normalize(input.normal);
+
+  // Apply diffuse lighting in world space in case the world transform
+  // contains scaling.
+  float4 check = checker(input.texcoord);
+  float4 directionalIntensity = saturate(dot(worldNormal, surfaceToLight));
+  float4 outColor = directionalIntensity * check;
+  return float4(outColor.rgb, 1);
+}
+
+// Here we tell our effect file *which* functions are
+// our vertex and pixel shaders.
+
+// #o3d VertexShaderEntryPoint vertexShaderFunction
+// #o3d PixelShaderEntryPoint pixelShaderFunction
+// #o3d MatrixLoadOrder RowMajor