Mesa (master): mesa: support for GL_ARB_fragment_coord_conventions

[Brian Paul]

Module: Mesa
Branch: master
Commit: e59353f592ef587d34279f0735f06053e289a7b4
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=e59353f592ef587d34279f0735f06053e289a7b4

Author: Luca Barbieri <luca at luca-barbieri.com>
Date:   Wed Jan 20 22:38:39 2010 -0800

mesa: support for GL_ARB_fragment_coord_conventions

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

---

 src/mesa/main/extensions.c            |    1 +
 src/mesa/main/mtypes.h                |    3 +++
 src/mesa/shader/arbprogparse.c        |    2 ++
 src/mesa/shader/program_parse_extra.c |   12 ++++++++++++
 src/mesa/shader/program_parser.h      |    2 ++
 5 files changed, 20 insertions(+), 0 deletions(-)

diff --git a/src/mesa/main/extensions.c b/src/mesa/main/extensions.c
index 00427aa..ac7ff26 100644
--- a/src/mesa/main/extensions.c
+++ b/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) },
diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index 7eff5ca..919ddd7 100644
--- a/src/mesa/main/mtypes.h
+++ b/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;
diff --git a/src/mesa/shader/arbprogparse.c b/src/mesa/shader/arbprogparse.c
index a09be71..3e22a8a 100644
--- a/src/mesa/shader/arbprogparse.c
+++ b/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;
 
diff --git a/src/mesa/shader/program_parse_extra.c b/src/mesa/shader/program_parse_extra.c
index 0656c5e..ae98b78 100644
--- a/src/mesa/shader/program_parse_extra.c
+++ b/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;
diff --git a/src/mesa/shader/program_parser.h b/src/mesa/shader/program_parser.h
index 69396ca..730466c 100644
--- a/src/mesa/shader/program_parser.h
+++ b/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 {