Fix swScissor() Y-axis clipping inversion in software renderer (#5976)

thiagomucci · web-flow · commit 7a247ff40fc5 · 2026-07-13T19:19:02.000+02:00
diff --git a/src/external/rlsw.h b/src/external/rlsw.h
@@ -4307,8 +4307,8 @@ void swScissor(int x, int y, int width, int height)
 
     RLSW.scClipMin[0] = (2.0f*(float)RLSW.scMin[0]/(float)RLSW.vpSize[0]) - 1.0f;
     RLSW.scClipMax[0] = (2.0f*(float)RLSW.scMax[0]/(float)RLSW.vpSize[0]) - 1.0f;
-    RLSW.scClipMax[1] = 1.0f - (2.0f*(float)RLSW.scMin[1]/(float)RLSW.vpSize[1]);
-    RLSW.scClipMin[1] = 1.0f - (2.0f*(float)RLSW.scMax[1]/(float)RLSW.vpSize[1]);
+    RLSW.scClipMin[1] = (2.0f*(float)RLSW.scMin[1]/(float)RLSW.vpSize[1]) - 1.0f;
+    RLSW.scClipMax[1] = (2.0f*(float)RLSW.scMax[1]/(float)RLSW.vpSize[1]) - 1.0f;
 }
 
 void swClearColor(float r, float g, float b, float a)

Original file line number	Diff line number	Diff line change
`@@ -4307,8 +4307,8 @@ void swScissor(int x, int y, int width, int height)`
`4307`	`4307`
`4308`	`4308`	`RLSW.scClipMin[0] = (2.0f*(float)RLSW.scMin[0]/(float)RLSW.vpSize[0]) - 1.0f;`
`4309`	`4309`	`RLSW.scClipMax[0] = (2.0f*(float)RLSW.scMax[0]/(float)RLSW.vpSize[0]) - 1.0f;`
`4310`		`- RLSW.scClipMax[1] = 1.0f - (2.0f*(float)RLSW.scMin[1]/(float)RLSW.vpSize[1]);`
`4311`		`- RLSW.scClipMin[1] = 1.0f - (2.0f*(float)RLSW.scMax[1]/(float)RLSW.vpSize[1]);`
	`4310`	`+ RLSW.scClipMin[1] = (2.0f*(float)RLSW.scMin[1]/(float)RLSW.vpSize[1]) - 1.0f;`
	`4311`	`+ RLSW.scClipMax[1] = (2.0f*(float)RLSW.scMax[1]/(float)RLSW.vpSize[1]) - 1.0f;`
`4312`	`4312`	`}`
`4313`	`4313`
`4314`	`4314`	`void swClearColor(float r, float g, float b, float a)`