mesa: Refactor copying of linked program data.

This patch creates a single function to copy the the UsesClipDistance
flag from gl_shader_program.Vert to gl_vertex_program.  Previously
this logic was duplicated in the i965-specific function
brw_link_shader() and the core mesa function _mesa_ir_link_shader().

This logic will have to be expanded to support geometry shaders, and I
don't want to have to update it in two separate places.

Reviewed-by: Ian Romanick <[email protected]>
Reviewed-by: Kenneth Graunke <[email protected]>

3 files changed, 32 insertions, 2 deletions

diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index c78fe855f6c..c166645aa0f 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -2329,9 +2329,13 @@ struct gl_shader_program
       GLenum OutputType; /**< GL_POINTS, GL_LINE_STRIP or GL_TRIANGLE_STRIP */
    } Geom;
 
-   /** Vertex shader state - copied into gl_vertex_program at link time */
+   /** Vertex shader state */
    struct {
-      GLboolean UsesClipDistance; /**< True if gl_ClipDistance is written to. */
+      /**
+       * True if gl_ClipDistance is written to.  Copied into gl_vertex_program
+       * by _mesa_copy_linked_program_data().
+       */
+      GLboolean UsesClipDistance;
       GLuint ClipDistanceArraySize; /**< Size of the gl_ClipDistance array, or
                                          0 if not present. */
    } Vert;
diff --git a/src/mesa/main/shaderapi.c b/src/mesa/main/shaderapi.c
index 3f9402c598c..8a0909be13f 100644
--- a/src/mesa/main/shaderapi.c
+++ b/src/mesa/main/shaderapi.c
@@ -1842,3 +1842,24 @@ _mesa_CreateShaderProgramEXT(GLenum type, const GLchar *string)
 
    return program;
 }
+
+
+/**
+ * Copy program-specific data generated by linking from the gl_shader_program
+ * object to a specific gl_program object.
+ */
+void
+_mesa_copy_linked_program_data(gl_shader_type type,
+                               const struct gl_shader_program *src,
+                               struct gl_program *dst)
+{
+   switch (type) {
+   case MESA_SHADER_VERTEX: {
+      struct gl_vertex_program *dst_vp = (struct gl_vertex_program *) dst;
+      dst_vp->UsesClipDistance = src->Vert.UsesClipDistance;
+   }
+      break;
+   default:
+      break;
+   }
+}
diff --git a/src/mesa/main/shaderapi.h b/src/mesa/main/shaderapi.h
index 1cd4ffcea03..fe58e7de9bd 100644
--- a/src/mesa/main/shaderapi.h
+++ b/src/mesa/main/shaderapi.h
@@ -210,6 +210,11 @@ _mesa_ActiveProgramEXT(GLuint program);
 extern GLuint GLAPIENTRY
 _mesa_CreateShaderProgramEXT(GLenum type, const GLchar *string);
 
+extern void
+_mesa_copy_linked_program_data(gl_shader_type type,
+                               const struct gl_shader_program *src,
+                               struct gl_program *dst);
+
 
 #ifdef __cplusplus
 }