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-rw-r--r--src/mesa/drivers/dri/i965/brw_wm_surface_state.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_wm_surface_state.c b/src/mesa/drivers/dri/i965/brw_wm_surface_state.c
index 8ffbc0a5fd5..e48b1e1d2d1 100644
--- a/src/mesa/drivers/dri/i965/brw_wm_surface_state.c
+++ b/src/mesa/drivers/dri/i965/brw_wm_surface_state.c
@@ -695,6 +695,24 @@ brw_update_buffer_texture_surface(struct gl_context *ctx,
bo = intel_bufferobj_buffer(brw, intel_obj, tObj->BufferOffset, size);
}
+ /* The ARB_texture_buffer_specification says:
+ *
+ * "The number of texels in the buffer texture's texel array is given by
+ *
+ * floor(<buffer_size> / (<components> * sizeof(<base_type>)),
+ *
+ * where <buffer_size> is the size of the buffer object, in basic
+ * machine units and <components> and <base_type> are the element count
+ * and base data type for elements, as specified in Table X.1. The
+ * number of texels in the texel array is then clamped to the
+ * implementation-dependent limit MAX_TEXTURE_BUFFER_SIZE_ARB."
+ *
+ * We need to clamp the size in bytes to MAX_TEXTURE_BUFFER_SIZE * stride,
+ * so that when ISL divides by stride to obtain the number of texels, that
+ * texel count is clamped to MAX_TEXTURE_BUFFER_SIZE.
+ */
+ size = MIN2(size, ctx->Const.MaxTextureBufferSize * (unsigned) texel_size);
+
if (brw_format == 0 && format != MESA_FORMAT_RGBA_FLOAT32) {
_mesa_problem(NULL, "bad format %s for texture buffer\n",
_mesa_get_format_name(format));