[Bug 14198] [i965] glBitmap should not render when draw buffer is set to GL_NONE

[bugzilla-daemon]

http://bugs.freedesktop.org/show_bug.cgi?id=14198





--- Comment #1 from Shuang He <[EMAIL PROTECTED]>  2008-01-22 17:26:47 PST ---
seems when draw buffer is set to GL_NONE, _NumColorDrawBuffers will be set to
0, so 
_ColorDrawBuffers will not be updated accordingly, in
update_color_draw_buffers()
this patch works for me:

--- a/src/mesa/main/framebuffer.c
+++ b/src/mesa/main/framebuffer.c
@@ -640,6 +640,10 @@ static void
 update_color_draw_buffers(GLcontext *ctx, struct gl_framebuffer *fb)
 {
    GLuint output;
+   if (fb->_NumColorDrawBuffers == 0) {
+      fb->_ColorDrawBuffers[0] = NULL;
+      return;
+   }

    for (output = 0; output < fb->_NumColorDrawBuffers; output++) {
       GLint buf = fb->_ColorDrawBufferIndexes[output];


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