nixpkgs/pkgs/development/libraries/mesa-darwin/patches/0003-mesa-fix-per-level-max-texture-size-error-checking.patch

From 9cf1afbf8ae87ddbb29b24a0f9f2724e9e2935c1 Mon Sep 17 00:00:00 2001
From: Brian Paul <brianp@vmware.com>
Date: Tue, 4 Sep 2012 20:17:15 -0600
Subject: [PATCH 03/13] mesa: fix per-level max texture size error checking
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This is a long-standing omission in Mesa's texture image size checking.
We need to take the mipmap level into consideration when checking if the
width, height and depth are too large.

Fixes the new piglit max-texture-size-level test.
Thanks to Stéphane Marchesin for finding this problem.

Note: This is a candidate for the stable branches.

Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
(cherry picked from commit 771e7b6d884bb4294a89f276a904d90b28efb90a)
---
 src/mesa/main/teximage.c | 36 +++++++++++++++++++++---------------
 1 file changed, 21 insertions(+), 15 deletions(-)

diff --git a/src/mesa/main/teximage.c b/src/mesa/main/teximage.c
index 3aecc0f..ed22fa9 100644
--- a/src/mesa/main/teximage.c
+++ b/src/mesa/main/teximage.c
@@ -1251,11 +1251,12 @@ _mesa_test_proxy_teximage(struct gl_context *ctx, GLenum target, GLint level,
 
    switch (target) {
    case GL_PROXY_TEXTURE_1D:
-      maxSize = 1 << (ctx->Const.MaxTextureLevels - 1);
-      if (width < 2 * border || width > 2 * border + maxSize)
-         return GL_FALSE;
       if (level >= ctx->Const.MaxTextureLevels)
          return GL_FALSE;
+      maxSize = 1 << (ctx->Const.MaxTextureLevels - 1); /* level zero size */
+      maxSize >>= level;  /* level size */
+      if (width < 2 * border || width > 2 * border + maxSize)
+         return GL_FALSE;
       if (!ctx->Extensions.ARB_texture_non_power_of_two) {
          if (width > 0 && !_mesa_is_pow_two(width - 2 * border))
             return GL_FALSE;
@@ -1263,13 +1264,14 @@ _mesa_test_proxy_teximage(struct gl_context *ctx, GLenum target, GLint level,
       return GL_TRUE;
 
    case GL_PROXY_TEXTURE_2D:
+      if (level >= ctx->Const.MaxTextureLevels)
+         return GL_FALSE;
       maxSize = 1 << (ctx->Const.MaxTextureLevels - 1);
+      maxSize >>= level;
       if (width < 2 * border || width > 2 * border + maxSize)
          return GL_FALSE;
       if (height < 2 * border || height > 2 * border + maxSize)
          return GL_FALSE;
-      if (level >= ctx->Const.MaxTextureLevels)
-         return GL_FALSE;
       if (!ctx->Extensions.ARB_texture_non_power_of_two) {
          if (width > 0 && !_mesa_is_pow_two(width - 2 * border))
             return GL_FALSE;
@@ -1279,15 +1281,16 @@ _mesa_test_proxy_teximage(struct gl_context *ctx, GLenum target, GLint level,
       return GL_TRUE;
 
    case GL_PROXY_TEXTURE_3D:
+      if (level >= ctx->Const.Max3DTextureLevels)
+         return GL_FALSE;
       maxSize = 1 << (ctx->Const.Max3DTextureLevels - 1);
+      maxSize >>= level;
       if (width < 2 * border || width > 2 * border + maxSize)
          return GL_FALSE;
       if (height < 2 * border || height > 2 * border + maxSize)
          return GL_FALSE;
       if (depth < 2 * border || depth > 2 * border + maxSize)
          return GL_FALSE;
-      if (level >= ctx->Const.Max3DTextureLevels)
-         return GL_FALSE;
       if (!ctx->Extensions.ARB_texture_non_power_of_two) {
          if (width > 0 && !_mesa_is_pow_two(width - 2 * border))
             return GL_FALSE;
@@ -1299,23 +1302,24 @@ _mesa_test_proxy_teximage(struct gl_context *ctx, GLenum target, GLint level,
       return GL_TRUE;
 
    case GL_PROXY_TEXTURE_RECTANGLE_NV:
+      if (level != 0)
+         return GL_FALSE;
       maxSize = ctx->Const.MaxTextureRectSize;
       if (width < 0 || width > maxSize)
          return GL_FALSE;
       if (height < 0 || height > maxSize)
          return GL_FALSE;
-      if (level != 0)
-         return GL_FALSE;
       return GL_TRUE;
 
    case GL_PROXY_TEXTURE_CUBE_MAP_ARB:
+      if (level >= ctx->Const.MaxCubeTextureLevels)
+         return GL_FALSE;
       maxSize = 1 << (ctx->Const.MaxCubeTextureLevels - 1);
+      maxSize >>= level;
       if (width < 2 * border || width > 2 * border + maxSize)
          return GL_FALSE;
       if (height < 2 * border || height > 2 * border + maxSize)
          return GL_FALSE;
-      if (level >= ctx->Const.MaxCubeTextureLevels)
-         return GL_FALSE;
       if (!ctx->Extensions.ARB_texture_non_power_of_two) {
          if (width > 0 && !_mesa_is_pow_two(width - 2 * border))
             return GL_FALSE;
@@ -1325,13 +1329,14 @@ _mesa_test_proxy_teximage(struct gl_context *ctx, GLenum target, GLint level,
       return GL_TRUE;
 
    case GL_PROXY_TEXTURE_1D_ARRAY_EXT:
+      if (level >= ctx->Const.MaxTextureLevels)
+         return GL_FALSE;
       maxSize = 1 << (ctx->Const.MaxTextureLevels - 1);
+      maxSize >>= level;
       if (width < 2 * border || width > 2 * border + maxSize)
          return GL_FALSE;
       if (height < 1 || height > ctx->Const.MaxArrayTextureLayers)
          return GL_FALSE;
-      if (level >= ctx->Const.MaxTextureLevels)
-         return GL_FALSE;
       if (!ctx->Extensions.ARB_texture_non_power_of_two) {
          if (width > 0 && !_mesa_is_pow_two(width - 2 * border))
             return GL_FALSE;
@@ -1339,15 +1344,16 @@ _mesa_test_proxy_teximage(struct gl_context *ctx, GLenum target, GLint level,
       return GL_TRUE;
 
    case GL_PROXY_TEXTURE_2D_ARRAY_EXT:
+      if (level >= ctx->Const.MaxTextureLevels)
+         return GL_FALSE;
       maxSize = 1 << (ctx->Const.MaxTextureLevels - 1);
+      maxSize >>= level;
       if (width < 2 * border || width > 2 * border + maxSize)
          return GL_FALSE;
       if (height < 2 * border || height > 2 * border + maxSize)
          return GL_FALSE;
       if (depth < 1 || depth > ctx->Const.MaxArrayTextureLayers)
          return GL_FALSE;
-      if (level >= ctx->Const.MaxTextureLevels)
-         return GL_FALSE;
       if (!ctx->Extensions.ARB_texture_non_power_of_two) {
          if (width > 0 && !_mesa_is_pow_two(width - 2 * border))
             return GL_FALSE;
-- 
1.9.2