Mesa (master): glsl: Implement the GL_ARB_conservative_depth extension.

[Kenneth Graunke]

Module: Mesa
Branch: master
Commit: b9eb4d8a59699e233255113acafae220c3d8fe3c
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=b9eb4d8a59699e233255113acafae220c3d8fe3c

Author: Kenneth Graunke <kenneth at whitecape.org>
Date:   Tue Aug  9 10:53:29 2011 -0700

glsl: Implement the GL_ARB_conservative_depth extension.

It's the same as GL_AMD_conservative_depth.  The specs have slight
differences in wording, but don't differ in content or behavior.

Signed-off-by: Kenneth Graunke <kenneth at whitecape.org>

---

 docs/GL3.txt                    |    2 +-
 src/glsl/glsl_parser.yy         |    4 ++--
 src/glsl/glsl_parser_extras.cpp |    1 +
 src/glsl/glsl_parser_extras.h   |    2 ++
 src/glsl/ir.h                   |    2 +-
 src/glsl/linker.cpp             |    2 +-
 src/mesa/main/extensions.c      |    1 +
 7 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/docs/GL3.txt b/docs/GL3.txt
index c0cc4d1..ff1f502 100644
--- a/docs/GL3.txt
+++ b/docs/GL3.txt
@@ -123,7 +123,7 @@ GL_ARB_texture_storage                               not started
 GL_ARB_transform_feedback_instanced                  not started
 GL_ARB_base_instance                                 not started
 GL_ARB_shader_image_load_store                       not started
-GL_ARB_conservative_depth                            not started (may be close to AMD_conservative_depth though)
+GL_ARB_conservative_depth                            DONE (compiler)
 GL_ARB_shading_language_420pack                      not started
 GL_ARB_internalformat_query                          not started
 GL_ARB_map_buffer_alignment                          not started
diff --git a/src/glsl/glsl_parser.yy b/src/glsl/glsl_parser.yy
index 1851f1e..25d02fb 100644
--- a/src/glsl/glsl_parser.yy
+++ b/src/glsl/glsl_parser.yy
@@ -1111,7 +1111,7 @@ layout_qualifier_id:
 	      }
 	   }
 
-	   /* Layout qualifiers for AMD_conservative_depth. */
+	   /* Layout qualifiers for AMD/ARB_conservative_depth. */
 	   if (!got_one && state->AMD_conservative_depth_enable) {
 	      if (strcmp($1, "depth_any") == 0) {
 	         got_one = true;
@@ -1129,7 +1129,7 @@ layout_qualifier_id:
 	
 	      if (got_one && state->AMD_conservative_depth_warn) {
 	         _mesa_glsl_warning(& @1, state,
-	                            "GL_AMD_conservative_depth "
+	                            "GL_ARB_conservative_depth "
 	                            "layout qualifier `%s' is used\n", $1);
 	      }
 	   }
diff --git a/src/glsl/glsl_parser_extras.cpp b/src/glsl/glsl_parser_extras.cpp
index cc78137..8f740e6 100644
--- a/src/glsl/glsl_parser_extras.cpp
+++ b/src/glsl/glsl_parser_extras.cpp
@@ -253,6 +253,7 @@ struct _mesa_glsl_extension {
 static const _mesa_glsl_extension _mesa_glsl_supported_extensions[] = {
    /*                                  target availability  API availability */
    /* name                             VS     GS     FS     GL     ES         supported flag */
+   EXT(ARB_conservative_depth,         true,  false, true,  true,  false,     AMD_conservative_depth),
    EXT(ARB_draw_buffers,               false, false, true,  true,  false,     dummy_true),
    EXT(ARB_draw_instanced,             true,  false, false, true,  false,     ARB_draw_instanced),
    EXT(ARB_explicit_attrib_location,   true,  false, true,  true,  false,     ARB_explicit_attrib_location),
diff --git a/src/glsl/glsl_parser_extras.h b/src/glsl/glsl_parser_extras.h
index fc392da..dc6911d 100644
--- a/src/glsl/glsl_parser_extras.h
+++ b/src/glsl/glsl_parser_extras.h
@@ -180,6 +180,8 @@ struct _mesa_glsl_parse_state {
    bool ARB_shader_stencil_export_warn;
    bool AMD_conservative_depth_enable;
    bool AMD_conservative_depth_warn;
+   bool ARB_conservative_depth_enable;
+   bool ARB_conservative_depth_warn;
    bool AMD_shader_stencil_export_enable;
    bool AMD_shader_stencil_export_warn;
    bool OES_texture_3D_enable;
diff --git a/src/glsl/ir.h b/src/glsl/ir.h
index 990aaa1..2e899f3 100644
--- a/src/glsl/ir.h
+++ b/src/glsl/ir.h
@@ -236,7 +236,7 @@ enum ir_variable_interpolation {
 /**
  * \brief Layout qualifiers for gl_FragDepth.
  *
- * The AMD_conservative_depth extension allows gl_FragDepth to be redeclared
+ * The AMD/ARB_conservative_depth extensions allow gl_FragDepth to be redeclared
  * with a layout qualifier.
  */
 enum ir_depth_layout {
diff --git a/src/glsl/linker.cpp b/src/glsl/linker.cpp
index b54ef41..ba81c59 100644
--- a/src/glsl/linker.cpp
+++ b/src/glsl/linker.cpp
@@ -395,7 +395,7 @@ cross_validate_globals(struct gl_shader_program *prog,
 
         /* Validate layout qualifiers for gl_FragDepth.
          *
-         * From the AMD_conservative_depth spec:
+         * From the AMD/ARB_conservative_depth specs:
          *    "If gl_FragDepth is redeclared in any fragment shader in
          *    a program, it must be redeclared in all fragment shaders in that
          *    program that have static assignments to gl_FragDepth. All
diff --git a/src/mesa/main/extensions.c b/src/mesa/main/extensions.c
index bc61c50..14b0cf9 100644
--- a/src/mesa/main/extensions.c
+++ b/src/mesa/main/extensions.c
@@ -81,6 +81,7 @@ static const struct extension extension_table[] = {
    { "GL_ARB_blend_func_extended",                 o(ARB_blend_func_extended),                 GL,             2009 },
    { "GL_ARB_color_buffer_float",                  o(ARB_color_buffer_float),                  GL,             2004 },
    { "GL_ARB_copy_buffer",                         o(ARB_copy_buffer),                         GL,             2008 },
+   { "GL_ARB_conservative_depth",                  o(AMD_conservative_depth),                  GL,             2011 },
    { "GL_ARB_depth_buffer_float",                  o(ARB_depth_buffer_float),                  GL,             2008 },
    { "GL_ARB_depth_clamp",                         o(ARB_depth_clamp),                         GL,             2003 },
    { "GL_ARB_depth_texture",                       o(ARB_depth_texture),                       GL,             2001 },