mesa: Restyle _mesa_check_blend_func_error().

I'm about to add more error conditions to this function, so I wanted to
move the current spec citation above the code that checks it.  Indenting
it required reformatting, so I tried to move it to our newer style.

While there, I also decided to drop some GL type usage, and drop the
unnecessary "_mesa_" prefix on a static function.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Francisco Jerez <currojerez@riseup.net>

diff --git a/src/mesa/main/context.c b/src/mesa/main/context.c
index 574c0fb7cec24b4b5aef686f1809ccdda3cc064c..4ff0979c00bbea0c912207cea98bf275ae1604f4 100644 (file)
--- a/src/mesa/main/context.c
+++ b/src/mesa/main/context.c
@@ -1855,28 +1855,28 @@ _mesa_Flush(void)
 }
 
 
-/*
- * ARB_blend_func_extended - ERRORS section
- * "The error INVALID_OPERATION is generated by Begin or any procedure that
- *  implicitly calls Begin if any draw buffer has a blend function requiring the
- *  second color input (SRC1_COLOR, ONE_MINUS_SRC1_COLOR, SRC1_ALPHA or
- *  ONE_MINUS_SRC1_ALPHA), and a framebuffer is bound that has more than
- *  the value of MAX_DUAL_SOURCE_DRAW_BUFFERS-1 active color attachements."
- */
-static GLboolean
-_mesa_check_blend_func_error(struct gl_context *ctx)
+static bool
+check_blend_func_error(struct gl_context *ctx)
 {
-   GLuint i;
-   for (i = ctx->Const.MaxDualSourceDrawBuffers;
+   /* The ARB_blend_func_extended spec's ERRORS section says:
+    *
+    *    "The error INVALID_OPERATION is generated by Begin or any procedure
+    *     that implicitly calls Begin if any draw buffer has a blend function
+    *     requiring the second color input (SRC1_COLOR, ONE_MINUS_SRC1_COLOR,
+    *     SRC1_ALPHA or ONE_MINUS_SRC1_ALPHA), and a framebuffer is bound that
+    *     has more than the value of MAX_DUAL_SOURCE_DRAW_BUFFERS-1 active
+    *     color attachements."
+    */
+   for (unsigned i = ctx->Const.MaxDualSourceDrawBuffers;
        i < ctx->DrawBuffer->_NumColorDrawBuffers;
        i++) {
       if (ctx->Color.Blend[i]._UsesDualSrc) {
         _mesa_error(ctx, GL_INVALID_OPERATION,
                     "dual source blend on illegal attachment");
-        return GL_FALSE;
+        return false;
       }
    }
-   return GL_TRUE;
+   return true;
 }
 
 
@@ -1951,7 +1951,7 @@ _mesa_valid_to_render(struct gl_context *ctx, const char *where)
       return GL_FALSE;
    }
 
-   if (_mesa_check_blend_func_error(ctx) == GL_FALSE) {
+   if (!check_blend_func_error(ctx)) {
       return GL_FALSE;
    }