[Mesa-dev] [PATCH 08/11] mesa: Add tracking for GL_PROGRAM_BINARY_RETRIEVABLE_HINT state

[Ian Romanick]

From: Ian Romanick <ian.d.romanick at intel.com>

Signed-off-by: Ian Romanick <ian.d.romanick at intel.com>
---
 src/mesa/main/mtypes.h    |  5 +++++
 src/mesa/main/shaderapi.c | 57 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 62 insertions(+)

diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index 097cdc1..1a2ed19 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -2302,6 +2302,11 @@ struct gl_shader_program
    GLboolean DeletePending;
 
    /**
+    * Is the application intending to glGetProgramBinary this program?
+    */
+   GLboolean BinaryRetreivableHint;
+
+   /**
     * Flags that the linker should not reject the program if it lacks
     * a vertex or fragment shader.  GLES2 doesn't allow separate
     * shader objects, and would reject them.  However, we internally
diff --git a/src/mesa/main/shaderapi.c b/src/mesa/main/shaderapi.c
index 53f593a..39a883e 100644
--- a/src/mesa/main/shaderapi.c
+++ b/src/mesa/main/shaderapi.c
@@ -583,6 +583,18 @@ get_programiv(struct gl_context *ctx, GLuint program, GLenum pname, GLint *param
 
       *params = shProg->NumUniformBlocks;
       return;
+   case GL_PROGRAM_BINARY_RETRIEVABLE_HINT:
+      /* This enum isn't part of the OES extension for OpenGL ES 2.0.  It is
+       * only available with desktop OpenGL 3.0+ with the
+       * GL_ARB_get_program_binary extension or OpenGL ES 3.0.
+       *
+       * On desktop, we ignore the 3.0+ requirement because it is silly.
+       */
+      if (!_mesa_is_desktop_gl(ctx) && !_mesa_is_gles3(ctx))
+         break;
+
+      *params = shProg->BinaryRetreivableHint;
+      return;
    default:
       break;
    }
@@ -1614,6 +1626,51 @@ _mesa_ProgramParameteri(GLuint program, GLenum pname, GLint value)
          return;
       }
       return;
+   case GL_PROGRAM_BINARY_RETRIEVABLE_HINT:
+      /* This enum isn't part of the OES extension for OpenGL ES 2.0, but it
+       * is part of OpenGL ES 3.0.  For the ES2 case, this function shouldn't
+       * even be in the dispatch table, so we shouldn't need to expclicitly
+       * check here.
+       *
+       * On desktop, we ignore the 3.0+ requirement because it is silly.
+       */
+
+      /* The ARB_get_program_binary extension spec says:
+       *
+       *     "An INVALID_VALUE error is generated if the <value> argument to
+       *     ProgramParameteri is not TRUE or FALSE."
+       */
+      if (value != GL_TRUE && value != GL_FALSE) {
+         _mesa_error(ctx, GL_INVALID_VALUE,
+                     "glProgramParameteri(pname=%s, value=%d): "
+                     "value must be 0 or 1.",
+                     _mesa_lookup_enum_by_nr(pname),
+                     value);
+         return;
+      }
+
+      /* No need to notify the driver.  Any changes will actually take effect
+       * the next time the shader is linked.
+       *
+       * The ARB_get_program_binary extension spec says:
+       *
+       *     "To indicate that a program binary is likely to be retrieved,
+       *     ProgramParameteri should be called with <pname>
+       *     PROGRAM_BINARY_RETRIEVABLE_HINT and <value> TRUE. This setting
+       *     will not be in effect until the next time LinkProgram or
+       *     ProgramBinary has been called successfully."
+       *
+       * The resloution of issue 9 in the extension spec also says:
+       *
+       *     "The application may use the PROGRAM_BINARY_RETRIEVABLE_HINT hint
+       *     to indicate to the GL implementation that this program will
+       *     likely be saved with GetProgramBinary at some point. This will
+       *     give the GL implementation the opportunity to track any state
+       *     changes made to the program before being saved such that when it
+       *     is loaded again a recompile can be avoided."
+       */
+      shProg->BinaryRetreivableHint = value;
+      return;
    default:
       break;
    }
-- 
1.7.11.7