r300: Fix crash in cubemap tree creation

The mip tree creation would crash if the first baselevel image to be uploaded
was not the positive-x image.

Found with Sauerbraten, also added a regression test to Piglit.

Signed-off-by: Nicolai Haehnle <nhaehnle@gmail.com>

diff --git a/src/mesa/drivers/dri/radeon/radeon_mipmap_tree.c b/src/mesa/drivers/dri/radeon/radeon_mipmap_tree.c
index 45c1d71..3203ee1 100644 (file)
--- a/src/mesa/drivers/dri/radeon/radeon_mipmap_tree.c
+++ b/src/mesa/drivers/dri/radeon/radeon_mipmap_tree.c
@@ -213,12 +213,26 @@ void radeon_miptree_unreference(radeon_mipmap_tree *mt)
 }
 
 
+/**
+ * Calculate first and last mip levels for the given texture object,
+ * where the dimensions are taken from the given texture image at
+ * the given level.
+ *
+ * Note: level is the OpenGL level number, which is not necessarily the same
+ * as the first level that is actually present.
+ *
+ * The base level image of the given texture face must be non-null,
+ * or this will fail.
+ */
 static void calculate_first_last_level(struct gl_texture_object *tObj,
-                                      GLuint *pfirstLevel, GLuint *plastLevel)
+                                      GLuint *pfirstLevel, GLuint *plastLevel,
+                                      GLuint face, GLuint level)
 {
        const struct gl_texture_image * const baseImage =
-               tObj->Image[0][tObj->BaseLevel];
+               tObj->Image[face][level];
 
+       assert(baseImage);
+       
        /* These must be signed values.  MinLod and MaxLod can be negative numbers,
        * and having firstLevel and lastLevel as signed prevents the need for
        * extra sign checks.
@@ -240,10 +254,10 @@ static void calculate_first_last_level(struct gl_texture_object *tObj,
                } else {
                        firstLevel = tObj->BaseLevel + (GLint)(tObj->MinLod + 0.5);
                        firstLevel = MAX2(firstLevel, tObj->BaseLevel);
-                       firstLevel = MIN2(firstLevel, tObj->BaseLevel + baseImage->MaxLog2);
+                       firstLevel = MIN2(firstLevel, level + baseImage->MaxLog2);
                        lastLevel = tObj->BaseLevel + (GLint)(tObj->MaxLod + 0.5);
                        lastLevel = MAX2(lastLevel, tObj->BaseLevel);
-                       lastLevel = MIN2(lastLevel, tObj->BaseLevel + baseImage->MaxLog2);
+                       lastLevel = MIN2(lastLevel, level + baseImage->MaxLog2);
                        lastLevel = MIN2(lastLevel, tObj->MaxLevel);
                        lastLevel = MAX2(firstLevel, lastLevel); /* need at least one level */
                }
@@ -302,7 +316,7 @@ GLboolean radeon_miptree_matches_texture(radeon_mipmap_tree *mt, struct gl_textu
        GLuint numfaces = 1;
        GLuint firstLevel, lastLevel;
 
-       calculate_first_last_level(texObj, &firstLevel, &lastLevel);
+       calculate_first_last_level(texObj, &firstLevel, &lastLevel, 0, texObj->BaseLevel);
        if (texObj->Target == GL_TEXTURE_CUBE_MAP)
                numfaces = 6;
 
@@ -332,7 +346,7 @@ void radeon_try_alloc_miptree(radeonContextPtr rmesa, radeonTexObj *t,
 
        assert(!t->mt);
 
-       calculate_first_last_level(&t->base, &firstLevel, &lastLevel);
+       calculate_first_last_level(&t->base, &firstLevel, &lastLevel, face, level);
        if (t->base.Target == GL_TEXTURE_CUBE_MAP)
                numfaces = 6;