Fixed the perspective matrix calculation (thanks @KonkolyTamas!)

Fixes https://github.com/libsdl-org/SDL/issues/13867
2025-09-04 06:04:01 -07:00
parent 637a9b34ab
commit ea1a769322
3 changed files with 3 additions and 3 deletions
--- a/test/testgpu_spinning_cube.c
+++ b/test/testgpu_spinning_cube.c
@@ -133,7 +133,7 @@ perspective_matrix(float fovy, float aspect, float znear, float zfar, float *r)
    int i;
    float f;

-    f = 1.0f/SDL_tanf(fovy * 0.5f);
+    f = 1.0f/SDL_tanf((fovy / 180.0f) * SDL_PI_F  * 0.5f);

    for (i = 0; i < 16; i++) {
        r[i] = 0.0;