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Optimise GL_POLYGON rendering

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This commit is contained in:
Luke Benstead 2019-03-25 09:48:58 +00:00
parent 291e82d18a
commit 671881eafd
1 changed files with 18 additions and 3 deletions
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21
GL/draw.c
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@ -850,7 +850,6 @@ static void generate(SubmissionTarget* target, const GLenum mode, const GLsizei
case GL_QUADS: case GL_QUADS:
genQuads(_glSubmissionTargetStart(target), count); genQuads(_glSubmissionTargetStart(target), count);
break; break;
case GL_POLYGON:
case GL_TRIANGLE_FAN: case GL_TRIANGLE_FAN:
genTriangleFan(_glSubmissionTargetStart(target), count); genTriangleFan(_glSubmissionTargetStart(target), count);
break; break;
@ -893,7 +892,6 @@ static void generate(SubmissionTarget* target, const GLenum mode, const GLsizei
case GL_QUADS: case GL_QUADS:
genQuads(it, count); genQuads(it, count);
break; break;
case GL_POLYGON:
case GL_TRIANGLE_FAN: case GL_TRIANGLE_FAN:
genTriangleFan(it, count); genTriangleFan(it, count);
break; break;
@ -1107,8 +1105,25 @@ static void submitVertices(GLenum mode, GLsizei first, GLuint count, GLenum type
profiler_push(__func__); profiler_push(__func__);
/* Polygons are treated as triangle fans, the only time this would be a
* problem is if we supported glPolygonMode(..., GL_LINE) but we don't.
* We optimise the triangle and quad cases.
*/
if(mode == GL_POLYGON) {
if(count == 3) {
mode = GL_TRIANGLES;
} else if(count == 4) {
mode = GL_QUADS;
} else {
mode = GL_TRIANGLE_FAN;
}
}
// We don't handle this any further, so just make sure we never pass it down */
assert(mode != GL_POLYGON);
target->output = _glActivePolyList(); target->output = _glActivePolyList();
target->count = (mode == GL_POLYGON || mode == GL_TRIANGLE_FAN) ? ((count - 2) * 3) : count; target->count = (mode == GL_TRIANGLE_FAN) ? ((count - 2) * 3) : count;
target->header_offset = target->output->vector.size; target->header_offset = target->output->vector.size;
target->start_offset = target->header_offset + 1; target->start_offset = target->header_offset + 1;