mesa: Add new functions and enums required by GL_ARB_sample_shading

New functions added by GL_ARB_sample_shading:
glMinSampleShadingARB()

New enums:
GL_SAMPLE_SHADING_ARB
GL_MIN_SAMPLE_SHADING_VALUE_ARB

V2: Update comments.
    Create new GL4x.xml.
    Remove redundant code in get.c.
    Update the API_XML list in Makefile.am.
    Add extra_gl40_ARB_sample_shading predicate to get.c.

V3:
   Fix make check failure.
   Add checks for desktop GL.
   Use GLfloat in place of GLclampf in glMinSampleShading().
Signed-off-by: Anuj Phogat <[email protected]>
Reviewed-by: Ken Graunke <[email protected]>

1 files changed, 18 insertions, 0 deletions

diff --git a/src/mesa/main/enable.c b/src/mesa/main/enable.c
index 5e2fd80d227..dd6a772f96c 100644
--- a/src/mesa/main/enable.c
+++ b/src/mesa/main/enable.c
@@ -802,6 +802,17 @@ _mesa_set_enable(struct gl_context *ctx, GLenum cap, GLboolean state)
          ctx->Multisample.SampleCoverageInvert = state;
          break;
 
+      /* GL_ARB_sample_shading */
+      case GL_SAMPLE_SHADING:
+         if (!_mesa_is_desktop_gl(ctx))
+            goto invalid_enum_error;
+         CHECK_EXTENSION(ARB_sample_shading, cap);
+         if (ctx->Multisample.SampleShading == state)
+            return;
+         FLUSH_VERTICES(ctx, _NEW_MULTISAMPLE);
+         ctx->Multisample.SampleShading = state;
+         break;
+
       /* GL_IBM_rasterpos_clip */
       case GL_RASTER_POSITION_UNCLIPPED_IBM:
          if (ctx->API != API_OPENGL_COMPAT)
@@ -1594,6 +1605,13 @@ _mesa_IsEnabled( GLenum cap )
          CHECK_EXTENSION(ARB_texture_multisample);
          return ctx->Multisample.SampleMask;
 
+      /* ARB_sample_shading */
+      case GL_SAMPLE_SHADING:
+         if (!_mesa_is_desktop_gl(ctx))
+            goto invalid_enum_error;
+         CHECK_EXTENSION(ARB_sample_shading);
+         return ctx->Multisample.SampleShading;
+
       default:
          goto invalid_enum_error;
    }