From 86eecc701e9891d7668cc01002070ff78b938ad2 Mon Sep 17 00:00:00 2001
From: Brian <brian.paul@tungstengraphics.com>
Date: Fri, 8 Jun 2007 14:13:13 -0600
Subject: [PATCH] In supported_buffer_bitmask(), use framebuffer's visual, not
 context's visual

---
 src/mesa/main/buffers.c | 51 +++++++++++++++++++----------------------
 1 file changed, 23 insertions(+), 28 deletions(-)

diff --git a/src/mesa/main/buffers.c b/src/mesa/main/buffers.c
index 11bd173e35c..c280f89e1d1 100644
--- a/src/mesa/main/buffers.c
+++ b/src/mesa/main/buffers.c
@@ -1,8 +1,8 @@
 /*
  * Mesa 3-D graphics library
- * Version:  6.5.2
+ * Version:  7.1
  *
- * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.
+ * Copyright (C) 1999-2007  Brian Paul   All Rights Reserved.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
@@ -184,17 +184,19 @@ _mesa_Clear( GLbitfield mask )
 
 /**
  * Return bitmask of BUFFER_BIT_* flags indicating which color buffers are
- * available to the rendering context.
- * This depends on the framebuffer we're writing to.  For window system
- * framebuffers we look at the framebuffer's visual.  But for user-
- * create framebuffers we look at the number of supported color attachments.
+ * available to the rendering context (for drawing or reading).
+ * This depends on the type of framebuffer.  For window system framebuffers
+ * we look at the framebuffer's visual.  But for user-create framebuffers we
+ * look at the number of supported color attachments.
+ * \param fb  the framebuffer to draw to, or read from
+ * \return  bitmask of BUFFER_BIT_* flags
  */
 static GLbitfield
-supported_buffer_bitmask(const GLcontext *ctx, GLuint framebufferID)
+supported_buffer_bitmask(const GLcontext *ctx, const struct gl_framebuffer *fb)
 {
    GLbitfield mask = 0x0;
 
-   if (framebufferID > 0) {
+   if (fb->Name > 0) {
       /* A user-created renderbuffer */
       GLuint i;
       ASSERT(ctx->Extensions.EXT_framebuffer_object);
@@ -203,20 +205,20 @@ supported_buffer_bitmask(const GLcontext *ctx, GLuint framebufferID)
       }
    }
    else {
-      /* A window system renderbuffer */
+      /* A window system framebuffer */
       GLint i;
       mask = BUFFER_BIT_FRONT_LEFT; /* always have this */
-      if (ctx->Visual.stereoMode) {
+      if (fb->Visual.stereoMode) {
          mask |= BUFFER_BIT_FRONT_RIGHT;
-         if (ctx->Visual.doubleBufferMode) {
+         if (fb->Visual.doubleBufferMode) {
             mask |= BUFFER_BIT_BACK_LEFT | BUFFER_BIT_BACK_RIGHT;
          }
       }
-      else if (ctx->Visual.doubleBufferMode) {
+      else if (fb->Visual.doubleBufferMode) {
          mask |= BUFFER_BIT_BACK_LEFT;
       }
 
-      for (i = 0; i < ctx->Visual.numAuxBuffers; i++) {
+      for (i = 0; i < fb->Visual.numAuxBuffers; i++) {
          mask |= (BUFFER_BIT_AUX0 << i);
       }
    }
@@ -338,7 +340,6 @@ read_buffer_enum_to_index(GLenum buffer)
 void GLAPIENTRY
 _mesa_DrawBuffer(GLenum buffer)
 {
-   GLuint bufferID;
    GLbitfield destMask;
    GET_CURRENT_CONTEXT(ctx);
    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx); /* too complex... */
@@ -347,13 +348,12 @@ _mesa_DrawBuffer(GLenum buffer)
       _mesa_debug(ctx, "glDrawBuffer %s\n", _mesa_lookup_enum_by_nr(buffer));
    }
 
-   bufferID = ctx->DrawBuffer->Name;
-
    if (buffer == GL_NONE) {
       destMask = 0x0;
    }
    else {
-      const GLbitfield supportedMask = supported_buffer_bitmask(ctx, bufferID);
+      const GLbitfield supportedMask
+         = supported_buffer_bitmask(ctx, ctx->DrawBuffer);
       destMask = draw_buffer_enum_to_bitmask(buffer);
       if (destMask == BAD_MASK) {
          /* totally bogus buffer */
@@ -386,7 +386,6 @@ void GLAPIENTRY
 _mesa_DrawBuffersARB(GLsizei n, const GLenum *buffers)
 {
    GLint output;
-   GLuint bufferID;
    GLbitfield usedBufferMask, supportedMask;
    GLbitfield destMask[MAX_DRAW_BUFFERS];
    GET_CURRENT_CONTEXT(ctx);
@@ -401,9 +400,7 @@ _mesa_DrawBuffersARB(GLsizei n, const GLenum *buffers)
       return;
    }
 
-   bufferID = ctx->DrawBuffer->Name;
-
-   supportedMask = supported_buffer_bitmask(ctx, bufferID);
+   supportedMask = supported_buffer_bitmask(ctx, ctx->DrawBuffer);
    usedBufferMask = 0x0;
 
    /* complicated error checking... */
@@ -492,8 +489,8 @@ _mesa_drawbuffers(GLcontext *ctx, GLuint n, const GLenum *buffers,
 
    if (!destMask) {
       /* compute destMask values now */
-      const GLuint bufferID = ctx->DrawBuffer->Name;
-      const GLbitfield supportedMask = supported_buffer_bitmask(ctx, bufferID);
+      const GLbitfield supportedMask
+         = supported_buffer_bitmask(ctx, ctx->DrawBuffer);
       for (output = 0; output < n; output++) {
          mask[output] = draw_buffer_enum_to_bitmask(buffers[output]);
          ASSERT(mask[output] != BAD_MASK);
@@ -534,17 +531,15 @@ _mesa_ReadBuffer(GLenum buffer)
    struct gl_framebuffer *fb;
    GLbitfield supportedMask;
    GLint srcBuffer;
-   GLuint bufferID;
    GET_CURRENT_CONTEXT(ctx);
    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 
    fb = ctx->ReadBuffer;
-   bufferID = fb->Name;
 
    if (MESA_VERBOSE & VERBOSE_API)
       _mesa_debug(ctx, "glReadBuffer %s\n", _mesa_lookup_enum_by_nr(buffer));
 
-   if (bufferID > 0 && buffer == GL_NONE) {
+   if (fb->Name > 0 && buffer == GL_NONE) {
       /* This is legal for user-created framebuffer objects */
       srcBuffer = -1;
    }
@@ -555,14 +550,14 @@ _mesa_ReadBuffer(GLenum buffer)
          _mesa_error(ctx, GL_INVALID_ENUM, "glReadBuffer(buffer=0x%x)", buffer);
          return;
       }
-      supportedMask = supported_buffer_bitmask(ctx, bufferID);
+      supportedMask = supported_buffer_bitmask(ctx, fb);
       if (((1 << srcBuffer) & supportedMask) == 0) {
          _mesa_error(ctx, GL_INVALID_OPERATION, "glReadBuffer(buffer=0x%x)", buffer);
          return;
       }
    }
 
-   if (bufferID == 0) {
+   if (fb->Name == 0) {
       ctx->Pixel.ReadBuffer = buffer;
    }
    fb->ColorReadBuffer = buffer;
-- 
2.30.2