st/xorg: fix composite after texture size changes

src/gallium/state_trackers/xorg/xorg_exa.c

@@ -48,6 +48,7 @@
 #include "util/u_debug.h"
 
 #define DEBUG_PRINT 0
+#define ROUND_UP_TEXTURES 1
 
 /*
  * Helper functions
@@ -273,13 +274,18 @@ ExaPrepareAccess(PixmapPtr pPix, int index)
 	    PIPE_REFERENCED_FOR_WRITE)
 	    exa->pipe->flush(exa->pipe, 0, NULL);
 
+        assert(pPix->drawable.width <= priv->tex->width[0]);
+        assert(pPix->drawable.height <= priv->tex->height[0]);
+
 	priv->map_transfer =
 	    exa->scrn->get_tex_transfer(exa->scrn, priv->tex, 0, 0, 0,
 #ifdef EXA_MIXED_PIXMAPS
 					PIPE_TRANSFER_MAP_DIRECTLY |
 #endif
 					PIPE_TRANSFER_READ_WRITE,
-					0, 0, priv->tex->width[0], priv->tex->height[0]);
+					0, 0, 
+                                        pPix->drawable.width,
+                                        pPix->drawable.height );
 	if (!priv->map_transfer)
 #ifdef EXA_MIXED_PIXMAPS
 	    return FALSE;
@@ -819,6 +825,22 @@ xorg_exa_get_pixmap_handle(PixmapPtr pPixmap, unsigned *stride_out)
     return handle;
 }
 
+static Bool
+size_match( int width, int tex_width )
+{
+#if ROUND_UP_TEXTURES
+   if (width > tex_width)
+      return FALSE;
+
+   if (width * 2 < tex_width)
+      return FALSE;
+
+   return TRUE;
+#else
+   return width == tex_width;
+#endif
+}
+
 static Bool
 ExaModifyPixmapHeader(PixmapPtr pPixmap, int width, int height,
 		      int depth, int bitsPerPixel, int devKind,
@@ -865,9 +887,9 @@ ExaModifyPixmapHeader(PixmapPtr pPixmap, int width, int height,
     /* Deal with screen resize */
     if ((exa->accel || priv->flags) &&
         (!priv->tex ||
-         (priv->tex->width[0] != width ||
-          priv->tex->height[0] != height ||
-          priv->tex_flags != priv->flags))) {
+         !size_match(priv->tex->width[0], width) ||
+         !size_match(priv->tex->height[0], height) ||
+         priv->tex_flags != priv->flags)) {
 	struct pipe_texture *texture = NULL;
 	struct pipe_texture template;
 
@@ -875,7 +897,7 @@ ExaModifyPixmapHeader(PixmapPtr pPixmap, int width, int height,
 	template.target = PIPE_TEXTURE_2D;
 	exa_get_pipe_format(depth, &template.format, &bitsPerPixel, &priv->picture_format);
 	pf_get_block(template.format, &template.block);
-#if 1
+#if ROUND_UP_TEXTURES
 	template.width[0] = util_next_power_of_two(width);
 	template.height[0] = util_next_power_of_two(height);
 #else

src/gallium/state_trackers/xorg/xorg_renderer.c

@@ -313,21 +313,25 @@ setup_vertex_data_yuv(struct xorg_renderer *r,
  * these concepts are linked.
  */
 void renderer_bind_destination(struct xorg_renderer *r,
-                               struct pipe_surface *surface )
+                               struct pipe_surface *surface,
+                               int width,
+                               int height )
 {
 
    struct pipe_framebuffer_state fb;
    struct pipe_viewport_state viewport;
-   int width = surface->width;
-   int height = surface->height;
 
+   /* Framebuffer uses actual surface width/height
+    */
    memset(&fb, 0, sizeof fb);
-   fb.width  = width;
-   fb.height = height;
+   fb.width  = surface->width;
+   fb.height = surface->height;
    fb.nr_cbufs = 1;
    fb.cbufs[0] = surface;
    fb.zsbuf = 0;
 
+   /* Viewport sets us up to just touch the bit we're interested in:
+    */
    viewport.scale[0] =  width / 2.f;
    viewport.scale[1] =  height / 2.f;
    viewport.scale[2] =  1.0;
@@ -337,6 +341,8 @@ void renderer_bind_destination(struct xorg_renderer *r,
    viewport.translate[2] = 0.0;
    viewport.translate[3] = 0.0;
 
+   /* Constant buffer set up to match viewport dimensions:
+    */
    if (r->fb_width != width ||
        r->fb_height != height) 
    {