[Mesa-dev] [Bug 93813] Incorrect viewport range when GL_CLIP_ORIGIN is GL_UPPER_LEFT

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93813

--- Comment #1 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Without trying to determine whether mesa or your test right, this "fixes" your
test:

diff --git a/src/mesa/main/viewport.c b/src/mesa/main/viewport.c
index 7d891429..2881a75 100644
--- a/src/mesa/main/viewport.c
+++ b/src/mesa/main/viewport.c
@@ -456,7 +456,7 @@ _mesa_get_viewport_xform(struct gl_context *ctx, unsigned
i,
    translate[0] = half_width + x;
    if (ctx->Transform.ClipOrigin == GL_UPPER_LEFT) {
       scale[1] = -half_height;
-      translate[1] = half_height - y;
+      translate[1] = half_height + y;
    } else {
       scale[1] = half_height;
       translate[1] = half_height + y;

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