Compiler - implement gl_PointCoord and point size clamping

TRAC #11592
Author: Nicolas Capens

git-svn-id: https://angleproject.googlecode.com/svn/trunk@70 736b8ea6-26fd-11df-bfd4-992fa37f6226

src/compiler/OutputHLSL.cpp

@@ -83,6 +83,7 @@ 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 float2 gl_PointCoord = float2(0.5, 0.5);\n"
                "static bool gl_FrontFacing = false;\n"
                "\n"
                "float4 gl_texture2D(sampler2D s, float2 t)\n"
@@ -180,7 +181,7 @@ void OutputHLSL::header()
         out << "};\n"
                "\n"
                "static float4 gl_Position = float4(0, 0, 0, 0);\n"
-               "static float gl_PointSize = float(0);\n";
+               "static float gl_PointSize = float(1);\n";
         out <<  varyingGlobals;
         out << "\n";
     }
@@ -792,7 +793,7 @@ bool OutputHLSL::visitAggregate(Visit visit, TIntermAggregate *node)
                                "    output.gl_Position.y = -(gl_Position.y - gl_HalfPixelSize.y * gl_Position.w);\n"
                                "    output.gl_Position.z = (gl_Position.z + gl_Position.w) * 0.5;\n"
                                "    output.gl_Position.w = gl_Position.w;\n"
-                               "    output.gl_PointSize = gl_PointSize;\n"
+                               "    output.gl_PointSize = 1.0;\n"
                                "    output.gl_FragCoord = gl_Position;\n";
 
                         TSymbolTableLevel *symbols = context.symbolTable.getGlobalLevel();

src/libGLESv2/Context.h

@@ -61,6 +61,9 @@ enum
     IMPLEMENTATION_COLOR_READ_TYPE = GL_UNSIGNED_SHORT_5_6_5
 };
 
+const float ALIASED_POINT_SIZE_RANGE_MIN = 1.0f;
+const float ALIASED_POINT_SIZE_RANGE_MAX = 1.0f;
+
 // Because indices are accessed internally, we convert them to a common format.
 typedef unsigned short Index;
 

src/libGLESv2/libGLESv2.cpp

@@ -1764,12 +1764,12 @@ void __stdcall glGetFloatv(GLenum pname, GLfloat* params)
         {
             switch (pname)
             {
-              case GL_LINE_WIDTH:                           *params = context->lineWidth;          break;
+              case GL_LINE_WIDTH:
+                *params = context->lineWidth;
+                break;
               case GL_ALIASED_LINE_WIDTH_RANGE:
-                {
-                    params[0] = 1.0f;
-                    params[1] = 1.0f;
-                }
+                params[0] = gl::ALIASED_POINT_SIZE_RANGE_MIN;
+                params[1] = gl::ALIASED_POINT_SIZE_RANGE_MAX;
                 break;
               default:
                 UNIMPLEMENTED();   // FIXME