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* clutter/cogl/gles/cogl-primitives.c: (_cogl_path_fill_nodes): draw

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the rasterized scanlines as an array of triangles.
This commit is contained in:
Øyvind Kolås 2008-05-01 11:27:58 +00:00
parent 0b7cab090c
commit bbe138298c
1 changed files with 70 additions and 23 deletions
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93
gles/cogl-primitives.c
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@ -243,11 +243,13 @@ _cogl_path_fill_nodes ()
cogl_rectangle (bounds_x, bounds_y, bounds_w, bounds_h);
GE( glDisable (GL_STENCIL_TEST) );
#endif
#else
{
GSList *scanlines[bounds_h];
/* This is our edge list it stores intersections between our curve and
* scanlines */
* scanlines, it should probably be implemented with a data structure
* that has smaller overhead for inserting the curve/scanline intersections.
*/
GSList *scanlines[bounds_h];
gint i;
gint prev_x;
@ -264,7 +266,7 @@ _cogl_path_fill_nodes ()
first_x = prev_x = CLUTTER_FIXED_TO_INT (ctx->path_nodes[0].x);
first_y = prev_y = CLUTTER_FIXED_TO_INT (ctx->path_nodes[0].y);
/* saturate scanline intersection list */
/* create scanline intersection list */
for (i=1; i<ctx->path_nodes_size; i++)
{
gint dest_x = CLUTTER_FIXED_TO_INT (ctx->path_nodes[i].x);
@ -327,29 +329,74 @@ fill_close:
}
}
/* for each scanline */
for (i=0; i < bounds_h; i++)
{
GSList *iter = scanlines[i];
while (iter)
{
GSList *next = iter->next;
gint startx, endx;
if (!next)
break;
{
gint spans = 0;
gint span_no;
GLfixed *coords;
startx = GPOINTER_TO_INT (iter->data);
endx = GPOINTER_TO_INT (next->data);
/* count number of spans */
for (i=0; i < bounds_h; i++)
{
GSList *iter = scanlines[i];
while (iter)
{
GSList *next = iter->next;
if (!next)
{
break;
}
/* draw the segments that should be visible */
spans ++;
iter = next->next;
}
}
coords = g_malloc0 (spans * sizeof (GLfixed) * 3 * 2 * 2);
/* draw the segments that should be visible */
span_no = 0;
/* build list of triangles */
for (i=0; i < bounds_h; i++)
{
GSList *iter = scanlines[i];
while (iter)
{
GSList *next = iter->next;
GLfixed x0, x1;
GLfixed y0, y1;
if (!next)
break;
cogl_rectangle (startx, i + bounds_y, endx - startx, 1);
iter = next->next;
}
if (scanlines[i])
g_slist_free (scanlines[i]);
}
x0 = CLUTTER_INT_TO_FIXED (GPOINTER_TO_INT (iter->data));
x1 = CLUTTER_INT_TO_FIXED (GPOINTER_TO_INT (next->data));
y0 = CLUTTER_INT_TO_FIXED (bounds_y + i);
y1 = CLUTTER_INT_TO_FIXED (bounds_y + i + 1) + 4096;
/* render scanlines 1.0625 high to avoid gaps when transformed */
coords[span_no * 12 + 0] = x0;
coords[span_no * 12 + 1] = y0;
coords[span_no * 12 + 2] = x1;
coords[span_no * 12 + 3] = y0;
coords[span_no * 12 + 4] = x1;
coords[span_no * 12 + 5] = y1;
coords[span_no * 12 + 6] = x0;
coords[span_no * 12 + 7] = y0;
coords[span_no * 12 + 8] = x0;
coords[span_no * 12 + 9] = y1;
coords[span_no * 12 + 10] = x1;
coords[span_no * 12 + 11] = y1;
span_no ++;
iter = next->next;
}
}
/* render triangles */
cogl_enable (COGL_ENABLE_VERTEX_ARRAY
| (ctx->color_alpha < 255 ? COGL_ENABLE_BLEND : 0));
GE ( glVertexPointer (2, GL_FIXED, 0, coords ) );
GE ( glDrawArrays (GL_TRIANGLES, 0, spans * 2 * 3));
g_free (coords);
}
}
#endif
}
void