/* Authors: Keith Whitwell <keith@tungstengraphics.com>
*/
+#include "pipe/p_context.h"
#include "pipe/p_defines.h"
#include "pipe/p_shader_tokens.h"
#include "util/u_math.h"
/**
* Draw a wide line by drawing a quad (two triangles).
- * XXX need to disable polygon stipple.
*/
static void wideline_line( struct draw_stage *stage,
struct prim_header *header )
const float dx = fabsf(pos0[0] - pos2[0]);
const float dy = fabsf(pos0[1] - pos2[1]);
+ const boolean gl_rasterization_rules =
+ stage->draw->rasterizer->gl_rasterization_rules;
+
/* small tweak to meet GL specification */
- const float bias = 0.125f;
+ const float bias = gl_rasterization_rules ? 0.125f : 0.0f;
/*
* Draw wide line as a quad (two tris) by "stretching" the line along
pos1[1] = pos1[1] + half_width - bias;
pos2[1] = pos2[1] - half_width - bias;
pos3[1] = pos3[1] + half_width - bias;
- if (pos0[0] < pos2[0]) {
- /* left to right line */
- pos0[0] -= 0.5f;
- pos1[0] -= 0.5f;
- pos2[0] -= 0.5f;
- pos3[0] -= 0.5f;
- }
- else {
- /* right to left line */
- pos0[0] += 0.5f;
- pos1[0] += 0.5f;
- pos2[0] += 0.5f;
- pos3[0] += 0.5f;
+ if (gl_rasterization_rules) {
+ if (pos0[0] < pos2[0]) {
+ /* left to right line */
+ pos0[0] -= 0.5f;
+ pos1[0] -= 0.5f;
+ pos2[0] -= 0.5f;
+ pos3[0] -= 0.5f;
+ }
+ else {
+ /* right to left line */
+ pos0[0] += 0.5f;
+ pos1[0] += 0.5f;
+ pos2[0] += 0.5f;
+ pos3[0] += 0.5f;
+ }
}
}
else {
pos1[0] = pos1[0] + half_width + bias;
pos2[0] = pos2[0] - half_width + bias;
pos3[0] = pos3[0] + half_width + bias;
- if (pos0[1] < pos2[1]) {
- /* top to bottom line */
- pos0[1] -= 0.5f;
- pos1[1] -= 0.5f;
- pos2[1] -= 0.5f;
- pos3[1] -= 0.5f;
- }
- else {
- /* bottom to top line */
- pos0[1] += 0.5f;
- pos1[1] += 0.5f;
- pos2[1] += 0.5f;
- pos3[1] += 0.5f;
+ if (gl_rasterization_rules) {
+ if (pos0[1] < pos2[1]) {
+ /* top to bottom line */
+ pos0[1] -= 0.5f;
+ pos1[1] -= 0.5f;
+ pos2[1] -= 0.5f;
+ pos3[1] -= 0.5f;
+ }
+ else {
+ /* bottom to top line */
+ pos0[1] += 0.5f;
+ pos1[1] += 0.5f;
+ pos2[1] += 0.5f;
+ pos3[1] += 0.5f;
+ }
}
}
}
+static void wideline_first_line( struct draw_stage *stage,
+ struct prim_header *header )
+{
+ struct draw_context *draw = stage->draw;
+ struct pipe_context *pipe = draw->pipe;
+ const struct pipe_rasterizer_state *rast = draw->rasterizer;
+ void *r;
+
+ /* Disable triangle culling, stippling, unfilled mode etc. */
+ r = draw_get_rasterizer_no_cull(draw, rast->scissor, rast->flatshade);
+ draw->suspend_flushing = TRUE;
+ pipe->bind_rasterizer_state(pipe, r);
+ draw->suspend_flushing = FALSE;
+
+ stage->line = wideline_line;
+
+ wideline_line(stage, header);
+}
+
+
static void wideline_flush( struct draw_stage *stage, unsigned flags )
{
+ struct draw_context *draw = stage->draw;
+ struct pipe_context *pipe = draw->pipe;
+
+ stage->line = wideline_first_line;
stage->next->flush( stage->next, flags );
+
+ /* restore original rasterizer state */
+ if (draw->rast_handle) {
+ draw->suspend_flushing = TRUE;
+ pipe->bind_rasterizer_state(pipe, draw->rast_handle);
+ draw->suspend_flushing = FALSE;
+ }
}
struct draw_stage *draw_wide_line_stage( struct draw_context *draw )
{
struct wideline_stage *wide = CALLOC_STRUCT(wideline_stage);
-
- draw_alloc_temp_verts( &wide->stage, 4 );
+ if (wide == NULL)
+ goto fail;
wide->stage.draw = draw;
wide->stage.name = "wide-line";
wide->stage.next = NULL;
wide->stage.point = draw_pipe_passthrough_point;
- wide->stage.line = wideline_line;
+ wide->stage.line = wideline_first_line;
wide->stage.tri = draw_pipe_passthrough_tri;
wide->stage.flush = wideline_flush;
wide->stage.reset_stipple_counter = wideline_reset_stipple_counter;
wide->stage.destroy = wideline_destroy;
+ if (!draw_alloc_temp_verts( &wide->stage, 4 ))
+ goto fail;
+
return &wide->stage;
+
+fail:
+ if (wide)
+ wide->stage.destroy( &wide->stage );
+
+ return NULL;
}