r300g: fix mipmapped 3D textures

This is a bug in the CS checker causing CS being rejected.

src/gallium/drivers/r300/r300_texture.c

@@ -759,6 +759,29 @@ static unsigned r300_texture_get_nblocksy(struct r300_texture* tex,
     return util_format_get_nblocksy(tex->b.b.format, height);
 }
 
+static void r300_texture_3d_fix_mipmapping(struct r300_screen *screen,
+                                           struct r300_texture *tex)
+{
+    /* The kernels <= 2.6.34-rc3 compute the size of mipmapped 3D textures
+     * incorrectly. This is a workaround to prevent CS from being rejected. */
+
+    unsigned i, size;
+
+    if (screen->rws->get_value(screen->rws, R300_VID_TEX3D_MIP_BUG) &&
+        tex->b.b.target == PIPE_TEXTURE_3D &&
+        tex->b.b.last_level > 0) {
+        size = 0;
+
+        for (i = 0; i <= tex->b.b.last_level; i++) {
+            size += r300_texture_get_stride(screen, tex, i) *
+                    r300_texture_get_nblocksy(tex, i);
+        }
+
+        size *= tex->b.b.depth0;
+        tex->size = size;
+    }
+}
+
 static void r300_setup_miptree(struct r300_screen* screen,
                                struct r300_texture* tex)
 {
@@ -930,6 +953,7 @@ struct pipe_resource* r300_texture_create(struct pipe_screen* screen,
         r300_setup_tiling(screen, tex);
     }
     r300_setup_miptree(rscreen, tex);
+    r300_texture_3d_fix_mipmapping(rscreen, tex);
     r300_texture_setup_immutable_state(rscreen, tex);
     r300_texture_setup_fb_state(rscreen, tex);
 

src/gallium/drivers/r300/r300_winsys.h

@@ -50,7 +50,8 @@ enum r300_value_id {
     R300_VID_PCI_ID,
     R300_VID_GB_PIPES,
     R300_VID_Z_PIPES,
-    R300_VID_SQUARE_TILING_SUPPORT
+    R300_VID_SQUARE_TILING_SUPPORT,
+    R300_VID_TEX3D_MIP_BUG,
 };
 
 struct r300_winsys_screen {

src/gallium/winsys/radeon/drm/radeon_drm.c

@@ -100,6 +100,9 @@ static void do_ioctls(int fd, struct radeon_libdrm_winsys* winsys)
                            version->version_minor >= 1;
 #endif
 
+    /* XXX */
+    winsys->tex3d_mip_bug = TRUE;
+
     info.request = RADEON_INFO_DEVICE_ID;
     retval = drmCommandWriteRead(fd, DRM_RADEON_INFO, &info, sizeof(info));
     if (retval) {

src/gallium/winsys/radeon/drm/radeon_r300.c

@@ -264,6 +264,8 @@ static uint32_t radeon_get_value(struct r300_winsys_screen *rws,
 	return ws->z_pipes;
     case R300_VID_SQUARE_TILING_SUPPORT:
         return ws->squaretiling;
+    case R300_VID_TEX3D_MIP_BUG:
+        return ws->tex3d_mip_bug;
     }
     return 0;
 }

src/gallium/winsys/radeon/drm/radeon_winsys.h

@@ -60,6 +60,9 @@ struct radeon_libdrm_winsys {
     /* Square tiling support. */
     boolean squaretiling;
 
+    /* Square tiling support. */
+    boolean tex3d_mip_bug;
+
     /* DRM FD */
     int fd;