Prototype compositor to render views to a texture using d3d 10. This

ui/gfx/resources/compositor.fx

+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// HLSL file used by views.
+
+Texture2D textureMap;
+
+// Blender to give source-over for textures.
+BlendState SrcAlphaBlendingAdd {
+  BlendEnable[0] = TRUE;
+  SrcBlend = ONE;
+  DestBlend = INV_SRC_ALPHA;
+  BlendOp = ADD;
+  SrcBlendAlpha = ONE;
+  DestBlendAlpha = INV_SRC_ALPHA;
+  BlendOpAlpha = ADD;
+  RenderTargetWriteMask[0] = 0x0F;  // Enables for all color components.
+};
+
+// Avoids doing depth detection, which would normally mean only the frontmost
+// texture is drawn.
+DepthStencilState StencilState {
+  DepthEnable = false;
+};
+
+cbuffer cbPerObject {
+  float4x4 gWVP;
+};
+
+struct VS_IN {
+  float3 posL : POSITION;
+  float2 texC : TEXC;
+};
+
+struct VS_OUT {
+  float4 posW : SV_POSITION;
+  float2 texC : TEXC;
+};
+
+SamplerState Sampler {
+  Filter = MIN_MAG_MIP_POINT;
+  AddressU = Wrap;
+  AddressV = Wrap;
+};
+
+VS_OUT VS(VS_IN vIn) {
+  VS_OUT vOut;
+  vOut.posW = mul(float4(vIn.posL, 1.0f), gWVP);
+  vOut.texC = vIn.texC;
+  return vOut;
+}
+
+float4 PS(VS_OUT pIn) : SV_Target {
+  return textureMap.Sample(Sampler, float2(pIn.texC));
+}
+
+technique10 ViewTech {
+  pass P0 {
+    SetVertexShader(CompileShader(vs_4_0, VS()));
+    SetGeometryShader(NULL);
+    SetPixelShader(CompileShader(ps_4_0, PS()));
+    SetDepthStencilState(StencilState, 0);
+    SetBlendState(SrcAlphaBlendingAdd, float4(0.0f, 0.0f, 0.0f, 0.0f),
+                   0xFFFFFFFF);

[Ben Goodger (Google), 2011/05/24 19:46:16]

nit: 1-space outdent

+  }
+}