Commit: 443699c201610a4caf57103329270122c57b0f1b
Author: Chris Blackbourn
Date: Thu Jun 9 13:03:12 2022 +1200
Branches: temp-circle
https://developer.blender.org/rB443699c201610a4caf57103329270122c57b0f1b
Cleanup (GPU): Faster circle drawing.
===================================================================
M source/blender/gpu/intern/gpu_immediate_util.c
===================================================================
diff --git a/source/blender/gpu/intern/gpu_immediate_util.c
b/source/blender/gpu/intern/gpu_immediate_util.c
index 67035853594..d03c3e8a8af 100644
--- a/source/blender/gpu/intern/gpu_immediate_util.c
+++ b/source/blender/gpu/intern/gpu_immediate_util.c
@@ -337,13 +337,27 @@ static void imm_draw_circle_3D(
/* Note(Metal/AMD): For small primitives, line list more efficient than
line strip. */
immBegin(GPU_PRIM_LINES, nsegments * 2);
- immVertex3f(pos, x + radius * cosf(0.0f), y + radius * sinf(0.0f), 0.0f);
- for (int i = 1; i < nsegments; i++) {
- float angle = (float)(2 * M_PI) * ((float)i / (float)nsegments);
- immVertex3f(pos, x + radius * cosf(angle), y + radius * sinf(angle),
0.0f);
- immVertex3f(pos, x + radius * cosf(angle), y + radius * sinf(angle),
0.0f);
+ const float angle = (float)(2 * M_PI / (float)nsegments);
+ float xprev = cosf(-angle) * radius;
+ float yprev = sinf(-angle) * radius;
+ const float alpha = 2.0f * cosf(angle);
+
+ float xr = radius;
+ float yr = 0;
+
+ for (int i = 0; i < nsegments; i++) {
+ immVertex3f(pos, x + xr, y + yr, 0.0f);
+ if (i) {
+ immVertex3f(pos, x + xr, y + yr, 0.0f);
+ }
+ const float xnext = alpha * xr - xprev;
+ const float ynext = alpha * yr - yprev;
+ xprev = xr;
+ yprev = yr;
+ xr = xnext;
+ yr = ynext;
}
- immVertex3f(pos, x + radius * cosf(0.0f), y + radius * sinf(0.0f), 0.0f);
+ immVertex3f(pos, x + radius, y, 0.0f);
immEnd();
}
else {
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