#include "brw_draw.h"
/**
+ * Check if the hardware's cut index support can handle the primitive
+ * restart index value.
+ */
+static bool
+can_cut_index_handle_restart_index(struct gl_context *ctx,
+ const struct _mesa_index_buffer *ib)
+{
+ bool cut_index_will_work;
+
+ switch (ib->type) {
+ case GL_UNSIGNED_BYTE:
+ cut_index_will_work = (ctx->Array.RestartIndex & 0xff) == 0xff;
+ break;
+ case GL_UNSIGNED_SHORT:
+ cut_index_will_work = (ctx->Array.RestartIndex & 0xffff) == 0xffff;
+ break;
+ case GL_UNSIGNED_INT:
+ cut_index_will_work = ctx->Array.RestartIndex == 0xffffffff;
+ break;
+ default:
+ cut_index_will_work = false;
+ assert(0);
+ }
+
+ return cut_index_will_work;
+}
+
+/**
+ * Check if the hardware's cut index support can handle the primitive
+ * restart case.
+ */
+static bool
+can_cut_index_handle_prims(struct gl_context *ctx,
+ const struct _mesa_prim *prim,
+ GLuint nr_prims,
+ const struct _mesa_index_buffer *ib)
+{
+ if (!can_cut_index_handle_restart_index(ctx, ib)) {
+ /* The primitive restart index can't be handled, so take
+ * the software path
+ */
+ return false;
+ }
+
+ for ( ; nr_prims > 0; nr_prims--) {
+ switch(prim->mode) {
+ case GL_POINTS:
+ case GL_LINES:
+ case GL_LINE_STRIP:
+ case GL_TRIANGLES:
+ case GL_TRIANGLE_STRIP:
+ /* Cut index supports these primitive types */
+ break;
+ default:
+ /* Cut index does not support these primitive types */
+ //case GL_LINE_LOOP:
+ //case GL_TRIANGLE_FAN:
+ //case GL_QUADS:
+ //case GL_QUAD_STRIP:
+ //case GL_POLYGON:
+ return false;
+ }
+ }
+
+ return true;
+}
+
+/**
* Check if primitive restart is enabled, and if so, handle it properly.
*
* In some cases the support will be handled in software. When available
*/
brw->prim_restart.in_progress = true;
- vbo_sw_primitive_restart(ctx, prim, nr_prims, ib);
+ if (can_cut_index_handle_prims(ctx, prim, nr_prims, ib)) {
+ /* Cut index should work for primitive restart, so use it
+ */
+ brw->prim_restart.enable_cut_index = true;
+ brw_draw_prims(ctx, prim, nr_prims, ib, GL_FALSE, -1, -1, NULL);
+ brw->prim_restart.enable_cut_index = false;
+ } else {
+ /* Not all the primitive draw modes are supported by the cut index,
+ * so take the software path
+ */
+ vbo_sw_primitive_restart(ctx, prim, nr_prims, ib);
+ }
brw->prim_restart.in_progress = false;