i915g: enable X-tiling for textures

Tiling is rather fragile in general and results in pure blackness when
unlucky.  Hence add a new option to disable tiling.

Signed-off-by: Daniel Vetter <[email protected]>
Reviewed-by: Jakob Bornecrantz <[email protected]>
Signed-off-by: Jakob Bornecrantz <[email protected]>

3 files changed, 27 insertions, 0 deletions

diff --git a/src/gallium/drivers/i915/i915_debug.c b/src/gallium/drivers/i915/i915_debug.c
index 57d3390dea3..d7150c99c4e 100644
--- a/src/gallium/drivers/i915/i915_debug.c
+++ b/src/gallium/drivers/i915/i915_debug.c
@@ -46,10 +46,12 @@ static const struct debug_named_value debug_options[] = {
 };
 
 unsigned i915_debug = 0;
+boolean i915_tiling = TRUE;
 
 void i915_debug_init(struct i915_screen *screen)
 {
    i915_debug = debug_get_flags_option("I915_DEBUG", debug_options, 0);
+   i915_tiling = !debug_get_bool_option("I915_NO_TILING", FALSE);
 }
 
 
diff --git a/src/gallium/drivers/i915/i915_debug.h b/src/gallium/drivers/i915/i915_debug.h
index fa60799d0c5..11af7662f0a 100644
--- a/src/gallium/drivers/i915/i915_debug.h
+++ b/src/gallium/drivers/i915/i915_debug.h
@@ -46,6 +46,7 @@ struct i915_winsys_batchbuffer;
 #define DBG_CONSTANTS 0x20
 
 extern unsigned i915_debug;
+extern boolean i915_tiling;
 
 #ifdef DEBUG
 static INLINE boolean
diff --git a/src/gallium/drivers/i915/i915_resource_texture.c b/src/gallium/drivers/i915/i915_resource_texture.c
index bb45a421707..3a0fc7fdef7 100644
--- a/src/gallium/drivers/i915/i915_resource_texture.c
+++ b/src/gallium/drivers/i915/i915_resource_texture.c
@@ -154,6 +154,26 @@ i915_texture_set_image_offset(struct i915_texture *tex,
 #endif
 }
 
+static enum i915_winsys_buffer_tile
+i915_texture_tiling(struct pipe_resource *pt)
+{
+   if (!i915_tiling)
+      return I915_TILE_NONE;
+
+   if (pt->target == PIPE_TEXTURE_1D)
+      return I915_TILE_NONE;
+
+   if (util_format_is_s3tc(pt->format))
+      /* XXX X-tiling might make sense */
+      return I915_TILE_NONE;
+
+   if ((pt->bind & PIPE_BIND_RENDER_TARGET))
+      /* XXX We can't render properly into mipmap'ed textures */
+      return I915_TILE_NONE;
+
+   return I915_TILE_X;
+}
+
 
 /*
  * Shared layout functions
@@ -370,6 +390,8 @@ i915_texture_layout(struct i915_texture * tex)
 {
    struct pipe_resource *pt = &tex->b.b;
 
+   tex->tiling = i915_texture_tiling(pt);
+
    switch (pt->target) {
    case PIPE_TEXTURE_1D:
    case PIPE_TEXTURE_2D:
@@ -616,6 +638,8 @@ i945_texture_layout(struct i915_texture * tex)
 {
    struct pipe_resource *pt = &tex->b.b;
 
+   tex->tiling = i915_texture_tiling(pt);
+
    switch (pt->target) {
    case PIPE_TEXTURE_1D:
    case PIPE_TEXTURE_2D: