#include "pipe/p_defines.h"
#include "draw_private.h"
#include "draw_pipe.h"
+#include "draw_fs.h"
struct unfilled_stage {
* and PIPE_POLYGON_MODE_POINT,
*/
unsigned mode[2];
+
+ int face_slot;
};
return (struct unfilled_stage *)stage;
}
+static void
+inject_front_face_info(struct draw_stage *stage,
+ struct prim_header *header)
+{
+ struct unfilled_stage *unfilled = unfilled_stage(stage);
+ unsigned ccw = header->det < 0.0;
+ boolean is_front_face = (
+ (stage->draw->rasterizer->front_ccw && ccw) ||
+ (!stage->draw->rasterizer->front_ccw && !ccw));
+ int slot = unfilled->face_slot;
+ unsigned i;
+
+ /* In case the backend doesn't care about it */
+ if (slot < 0) {
+ return;
+ }
+
+ for (i = 0; i < 3; ++i) {
+ struct vertex_header *v = header->v[i];
+ v->data[slot][0] = is_front_face;
+ v->data[slot][1] = is_front_face;
+ v->data[slot][2] = is_front_face;
+ v->data[slot][3] = is_front_face;
+ }
+}
-
+
static void point( struct draw_stage *stage,
struct vertex_header *v0 )
{
struct vertex_header *v1 = header->v[1];
struct vertex_header *v2 = header->v[2];
+ inject_front_face_info(stage, header);
+
if ((header->flags & DRAW_PIPE_EDGE_FLAG_0) && v0->edgeflag) point( stage, v0 );
if ((header->flags & DRAW_PIPE_EDGE_FLAG_1) && v1->edgeflag) point( stage, v1 );
if ((header->flags & DRAW_PIPE_EDGE_FLAG_2) && v2->edgeflag) point( stage, v2 );
if (header->flags & DRAW_PIPE_RESET_STIPPLE)
stage->next->reset_stipple_counter( stage->next );
+ inject_front_face_info(stage, header);
+
if ((header->flags & DRAW_PIPE_EDGE_FLAG_2) && v2->edgeflag) line( stage, v2, v0 );
if ((header->flags & DRAW_PIPE_EDGE_FLAG_0) && v0->edgeflag) line( stage, v0, v1 );
if ((header->flags & DRAW_PIPE_EDGE_FLAG_1) && v1->edgeflag) line( stage, v1, v2 );
struct prim_header *header )
{
struct unfilled_stage *unfilled = unfilled_stage(stage);
- unsigned mode = unfilled->mode[header->det >= 0.0];
+ unsigned cw = header->det >= 0.0;
+ unsigned mode = unfilled->mode[cw];
if (0)
print_header_flags(header->flags);
struct unfilled_stage *unfilled = unfilled_stage(stage);
const struct pipe_rasterizer_state *rast = stage->draw->rasterizer;
- unfilled->mode[rast->front_ccw ? 0 : 1] = rast->fill_front;
- unfilled->mode[rast->front_ccw ? 1 : 0] = rast->fill_back;
+ unfilled->mode[0] = rast->front_ccw ? rast->fill_front : rast->fill_back;
+ unfilled->mode[1] = rast->front_ccw ? rast->fill_back : rast->fill_front;
stage->tri = unfilled_tri;
stage->tri( stage, header );
FREE( stage );
}
+/*
+ * Try to allocate an output slot which we can use
+ * to preserve the front face information.
+ */
+void
+draw_unfilled_prepare_outputs( struct draw_context *draw,
+ struct draw_stage *stage )
+{
+ struct unfilled_stage *unfilled = unfilled_stage(stage);
+ const struct pipe_rasterizer_state *rast = draw ? draw->rasterizer : 0;
+ boolean is_unfilled = (rast &&
+ (rast->fill_front != PIPE_POLYGON_MODE_FILL ||
+ rast->fill_back != PIPE_POLYGON_MODE_FILL));
+ const struct draw_fragment_shader *fs = draw->fs.fragment_shader;
+
+ if (is_unfilled && fs && fs->info.uses_frontface) {
+ unfilled->face_slot = draw_alloc_extra_vertex_attrib(
+ stage->draw, TGSI_SEMANTIC_FACE, 0);
+ } else {
+ unfilled->face_slot = -1;
+ }
+}
+
/**
* Create unfilled triangle stage.
if (unfilled == NULL)
goto fail;
- if (!draw_alloc_temp_verts( &unfilled->stage, 0 ))
- goto fail;
-
unfilled->stage.draw = draw;
unfilled->stage.name = "unfilled";
unfilled->stage.next = NULL;
unfilled->stage.reset_stipple_counter = unfilled_reset_stipple_counter;
unfilled->stage.destroy = unfilled_destroy;
+ unfilled->face_slot = -1;
+
+ if (!draw_alloc_temp_verts( &unfilled->stage, 0 ))
+ goto fail;
+
return &unfilled->stage;
fail: