mesa: support for GL_ARB_fragment_coord_conventions

Signed-off-by: Brian Paul <brianp@vmware.com>

src/mesa/main/extensions.c

@@ -50,6 +50,7 @@ static const struct {
    { OFF, "GL_ARB_depth_clamp",                F(ARB_depth_clamp) },
    { ON,  "GL_ARB_draw_buffers",               F(ARB_draw_buffers) },
    { OFF, "GL_ARB_draw_elements_base_vertex",  F(ARB_draw_elements_base_vertex) },
+   { OFF, "GL_ARB_fragment_coord_conventions",    F(ARB_fragment_coord_conventions) },
    { OFF, "GL_ARB_fragment_program",           F(ARB_fragment_program) },
    { OFF, "GL_ARB_fragment_program_shadow",    F(ARB_fragment_program_shadow) },
    { OFF, "GL_ARB_fragment_shader",            F(ARB_fragment_shader) },

src/mesa/main/mtypes.h

@@ -1762,6 +1762,8 @@ struct gl_fragment_program
    struct gl_program Base;   /**< base class */
    GLenum FogOption;
    GLboolean UsesKill;          /**< shader uses KIL instruction */
+   GLboolean OriginUpperLeft;
+   GLboolean PixelCenterInteger;
 };
 
 
@@ -2395,6 +2397,7 @@ struct gl_extensions
    GLboolean ARB_depth_clamp;
    GLboolean ARB_draw_buffers;
    GLboolean ARB_draw_elements_base_vertex;
+   GLboolean ARB_fragment_coord_conventions;
    GLboolean ARB_fragment_program;
    GLboolean ARB_fragment_program_shadow;
    GLboolean ARB_fragment_shader;

src/mesa/shader/arbprogparse.c

@@ -123,6 +123,8 @@ _mesa_parse_arb_fragment_program(GLcontext* ctx, GLenum target,
    case OPTION_FOG_LINEAR: program->FogOption = GL_LINEAR; break;
    default:                program->FogOption = GL_NONE;   break;
    }
+   program->OriginUpperLeft = state.option.OriginUpperLeft;
+   program->PixelCenterInteger = state.option.PixelCenterInteger;
 
    program->UsesKill            = state.fragment.UsesKill;
 

src/mesa/shader/program_parse_extra.c

@@ -216,6 +216,18 @@ _mesa_ARBfp_parse_option(struct asm_parser_state *state, const char *option)
 	    state->option.Shadow = 1;
 	    return 1;
 	 }
+      } else if (strncmp(option, "fragment_coord_", 15) == 0) {
+         option += 15;
+         if (state->ctx->Extensions.ARB_fragment_coord_conventions) {
+            if (strcmp(option, "origin_upper_left") == 0) {
+               state->option.OriginUpperLeft = 1;
+               return 1;
+            }
+            else if (strcmp(option, "pixel_center_integer") == 0) {
+               state->option.PixelCenterInteger = 1;
+               return 1;
+            }
+         }
       }
    } else if (strncmp(option, "NV_fragment_program", 19) == 0) {
       option += 19;

src/mesa/shader/program_parser.h

@@ -209,6 +209,8 @@ struct asm_parser_state {
       unsigned TexRect:1;
       unsigned TexArray:1;
       unsigned NV_fragment:1;
+      unsigned OriginUpperLeft:1;
+      unsigned PixelCenterInteger:1;
    } option;
 
    struct {