Compiler - implement gl_FrontFacing

TRAC #11368
Signed-off-by: Andrew Lewycky
Signed-off-by: Daniel Koch
From:    Nicolas Capens <nicolas@transgaming.com>

git-svn-id: https://angleproject.googlecode.com/svn/trunk@22 736b8ea6-26fd-11df-bfd4-992fa37f6226

Compiler/OutputHLSL.cpp

@@ -58,13 +58,15 @@ void OutputHLSL::header()
 
         out << "uniform float4 gl_Window;\n"
                "uniform float2 gl_Depth;\n"
+               "uniform bool __frontCCW;\n"
                "\n";
         out <<  uniforms;
         out << "\n"
                "struct PS_INPUT\n"   // FIXME: Prevent name clashes
                "{\n";
         out <<      varyingInput;
-        out << "    float4 gl_FragCoord : TEXCOORD" << HLSL_FRAG_COORD_SEMANTIC << ";\n"
+        out << "    float4 gl_FragCoord : TEXCOORD" << HLSL_FRAG_COORD_SEMANTIC << ";\n";
+        out << "    float __vFace : VFACE;\n"
                "};\n"
                "\n";
         out <<    varyingGlobals;
@@ -76,6 +78,7 @@ void OutputHLSL::header()
                "\n"
                "static float4 gl_Color[1] = {float4(0, 0, 0, 0)};\n"
                "static float4 gl_FragCoord = float4(0, 0, 0, 0);\n"
+               "static bool gl_FrontFacing = false;\n"
                "\n"
                "float4 gl_texture2D(sampler2D s, float2 t)\n"
                "{\n"
@@ -635,7 +638,8 @@ bool OutputHLSL::visitAggregate(Visit visit, TIntermAggregate *node)
                                "    gl_FragCoord.x = (input.gl_FragCoord.x * rhw) * gl_Window.x + gl_Window.z;\n"
                                "    gl_FragCoord.y = (input.gl_FragCoord.y * rhw) * gl_Window.y + gl_Window.w;\n"
                                "    gl_FragCoord.z = (input.gl_FragCoord.z * rhw) * gl_Depth.x + gl_Depth.y;\n"
-                               "    gl_FragCoord.w = rhw;\n";
+                               "    gl_FragCoord.w = rhw;\n"
+                               "    gl_FrontFacing = __frontCCW ? (input.__vFace >= 0.0) : (input.__vFace <= 0.0);\n";
 
                         for (TSymbolTableLevel::const_iterator namedSymbol = symbols->begin(); namedSymbol != symbols->end(); namedSymbol++)
                         {

libGLESv2/Context.cpp

@@ -792,25 +792,25 @@ bool Context::applyRenderTarget(bool ignoreViewport)
         renderTarget->GetDesc(&description);
         Program *programObject = getCurrentProgram();
 
-        GLuint halfPixelSize = programObject->getUniformLocation("gl_HalfPixelSize");
+        GLint halfPixelSize = programObject->getUniformLocation("gl_HalfPixelSize");
         GLfloat xy[2] = {1.0f / description.Width, 1.0f / description.Height};
         programObject->setUniform2fv(halfPixelSize, 1, (GLfloat*)&xy);
 
-        GLuint window = programObject->getUniformLocation("gl_Window");
+        GLint window = programObject->getUniformLocation("gl_Window");
         GLfloat whxy[4] = {viewportWidth / 2.0f, viewportHeight / 2.0f, (float)viewportX + viewportWidth / 2.0f, (float)viewportY + viewportHeight / 2.0f};
         programObject->setUniform4fv(window, 1, (GLfloat*)&whxy);
 
-        GLuint depth = programObject->getUniformLocation("gl_Depth");
+        GLint depth = programObject->getUniformLocation("gl_Depth");
         GLfloat dz[2] = {(zFar - zNear) / 2.0f, (zNear + zFar) / 2.0f};
         programObject->setUniform2fv(depth, 1, (GLfloat*)&dz);
 
-        GLuint near = programObject->getUniformLocation("gl_DepthRange.near");
+        GLint near = programObject->getUniformLocation("gl_DepthRange.near");
         programObject->setUniform1fv(near, 1, &zNear);
 
-        GLuint far = programObject->getUniformLocation("gl_DepthRange.far");
+        GLint far = programObject->getUniformLocation("gl_DepthRange.far");
         programObject->setUniform1fv(far, 1, &zFar);
 
-        GLuint diff = programObject->getUniformLocation("gl_DepthRange.diff");
+        GLint diff = programObject->getUniformLocation("gl_DepthRange.diff");
         GLfloat zDiff = zFar - zNear;
         programObject->setUniform1fv(diff, 1, &zDiff);
     }
@@ -822,6 +822,11 @@ bool Context::applyRenderTarget(bool ignoreViewport)
 void Context::applyState()
 {
     IDirect3DDevice9 *device = getDevice();
+    Program *programObject = getCurrentProgram();
+
+    GLint frontCCW = programObject->getUniformLocation("__frontCCW");
+    GLint ccw = (frontFace == GL_CCW);
+    programObject->setUniform1iv(frontCCW, 1, &ccw);
 
     if (cullFace)
     {