mesa: Track fixed-function fragment shader as a shader

Previously the fixed-function fragment shader was tracked as a
gl_program.  This means that it shows up in the driver as a Mesa IR
program instead of as a GLSL IR program.  If a driver doesn't generate
Mesa IR from the GLSL IR, that program is empty.  If the program is
empty there is either no rendering or a GPU hang.

Signed-off-by: Ian Romanick <[email protected]>
Reviewed-by: Eric Anholt <[email protected]>
Acked-by: Kenneth Graunke <[email protected]>

1 files changed, 29 insertions, 0 deletions

diff --git a/src/mesa/main/shaderapi.c b/src/mesa/main/shaderapi.c
index 9372d6decf6..f3f13a02645 100644
--- a/src/mesa/main/shaderapi.c
+++ b/src/mesa/main/shaderapi.c
@@ -124,6 +124,8 @@ _mesa_free_shader_state(struct gl_context *ctx)
 				  NULL);
    _mesa_reference_shader_program(ctx, &ctx->Shader.CurrentFragmentProgram,
 				  NULL);
+   _mesa_reference_shader_program(ctx, &ctx->Shader._CurrentFragmentProgram,
+				  NULL);
    _mesa_reference_shader_program(ctx, &ctx->Shader.ActiveProgram, NULL);
 }
 
@@ -876,6 +878,33 @@ use_shader_program(struct gl_context *ctx, GLenum type,
 
    if (*target != shProg) {
       FLUSH_VERTICES(ctx, _NEW_PROGRAM | _NEW_PROGRAM_CONSTANTS);
+
+      /* If the shader is also bound as the current rendering shader, unbind
+       * it from that binding point as well.  This ensures that the correct
+       * semantics of glDeleteProgram are maintained.
+       */
+      switch (type) {
+#if FEATURE_ARB_vertex_shader
+      case GL_VERTEX_SHADER:
+	 /* Empty for now. */
+	 break;
+#endif
+#if FEATURE_ARB_geometry_shader4
+      case GL_GEOMETRY_SHADER_ARB:
+	 /* Empty for now. */
+	 break;
+#endif
+#if FEATURE_ARB_fragment_shader
+      case GL_FRAGMENT_SHADER:
+	 if (*target == ctx->Shader._CurrentFragmentProgram) {
+	    _mesa_reference_shader_program(ctx,
+					   &ctx->Shader._CurrentFragmentProgram,
+					   NULL);
+	 }
+	 break;
+#endif
+      }
+
       _mesa_reference_shader_program(ctx, target, shProg);
       return true;
    }