mesa: add a UniformBooleanTrue option

Drivers supporting native integers set UniformBooleanTrue to the integer value
that should be used for true when uploading uniform booleans.  This is ~0 for
Gallium and 1 for i965.

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

2 files changed, 10 insertions, 1 deletions

diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index 44ebf0a5351..ad5979796d6 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -2722,6 +2722,12 @@ struct gl_constants
     */
    GLboolean NativeIntegers;
 
+   /**
+    * If the driver supports real 32-bit integers, what integer value should be
+    * used for boolean true in uniform uploads?  (Usually 1 or ~0.)
+    */
+   GLuint UniformBooleanTrue;
+
    /** Which texture units support GL_ATI_envmap_bumpmap as targets */
    GLbitfield SupportedBumpUnits;
 
diff --git a/src/mesa/main/uniforms.c b/src/mesa/main/uniforms.c
index fe1ce6d7b2c..b0f9c33b8d3 100644
--- a/src/mesa/main/uniforms.c
+++ b/src/mesa/main/uniforms.c
@@ -802,7 +802,10 @@ set_program_uniform(struct gl_context *ctx, struct gl_program *program,
                else
                   uniformVal[i].b = uniformVal[i].u ? 1 : 0;
                
-               if (!ctx->Const.NativeIntegers)
+               if (ctx->Const.NativeIntegers)
+                  uniformVal[i].u =
+                        uniformVal[i].b ? ctx->Const.UniformBooleanTrue : 0;
+               else
                   uniformVal[i].f = uniformVal[i].b ? 1.0f : 0.0f;
             }
          }