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Implement line stippling.

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Also added draw_stage::reset_line_stipple().  There may be a better way
of doing that though.
This commit is contained in:
Brian
2007-07-25 15:48:09 -06:00
parent 1f6b4b0f75
commit 0360b49afb
10 changed files with 90 additions and 3 deletions
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38
src/mesa/pipe/softpipe/sp_prim_setup.c
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@@ -706,6 +706,17 @@ plot(struct setup_stage *setup, GLint x, GLint y)
}
/**
* Determine whether or not to emit a line fragment by checking
* line stipple pattern.
*/
static INLINE GLuint
stipple_test(GLint counter, GLushort pattern, GLint factor)
{
GLint b = (counter / factor) & 0xf;
return (1 << b) & pattern;
}
/**
* Do setup for line rasterization, then render the line.
@@ -718,6 +729,7 @@ setup_line(struct draw_stage *stage, struct prim_header *prim)
const struct vertex_header *v0 = prim->v[0];
const struct vertex_header *v1 = prim->v[1];
struct setup_stage *setup = setup_stage( stage );
struct softpipe_context *sp = setup->softpipe;
GLint x0 = (GLint) v0->data[0][0];
GLint x1 = (GLint) v1->data[0][0];
@@ -763,7 +775,12 @@ setup_line(struct draw_stage *stage, struct prim_header *prim)
const GLint errorDec = error - dx;
for (i = 0; i < dx; i++) {
plot(setup, x0, y0);
if (!sp->setup.line_stipple_enable ||
stipple_test(sp->line_stipple_counter,
sp->setup.line_stipple_pattern,
sp->setup.line_stipple_factor + 1)) {
plot(setup, x0, y0);
}
x0 += xstep;
if (error < 0) {
@@ -773,6 +790,8 @@ setup_line(struct draw_stage *stage, struct prim_header *prim)
error += errorDec;
y0 += ystep;
}
sp->line_stipple_counter++;
}
}
else {
@@ -783,7 +802,12 @@ setup_line(struct draw_stage *stage, struct prim_header *prim)
const GLint errorDec = error - dy;
for (i = 0; i < dy; i++) {
plot(setup, x0, y0);
if (!sp->setup.line_stipple_enable ||
stipple_test(sp->line_stipple_counter,
sp->setup.line_stipple_pattern,
sp->setup.line_stipple_factor + 1)) {
plot(setup, x0, y0);
}
y0 += ystep;
@@ -794,6 +818,8 @@ setup_line(struct draw_stage *stage, struct prim_header *prim)
error += errorDec;
x0 += xstep;
}
sp->line_stipple_counter++;
}
}
@@ -984,6 +1010,13 @@ static void setup_end( struct draw_stage *stage )
}
static void reset_stipple_counter( struct draw_stage *stage )
{
struct setup_stage *setup = setup_stage(stage);
setup->softpipe->line_stipple_counter = 0;
}
/**
* Create a new primitive setup/render stage.
*/
@@ -998,6 +1031,7 @@ struct draw_stage *sp_draw_render_stage( struct softpipe_context *softpipe )
setup->stage.line = setup_line;
setup->stage.tri = setup_tri;
setup->stage.end = setup_end;
setup->stage.reset_stipple_counter = reset_stipple_counter;
setup->quad.coef = setup->coef;