*背面剔除

1 files changed, 12 insertions, 0 deletions

diff --git a/src/math/matrix.c b/src/math/matrix.c
index 458f432..15a194d 100644
--- a/src/math/matrix.c
+++ b/src/math/matrix.c
@@ -61,6 +61,18 @@ void mat4_setidentity(Mat4* out) {
 	out->e33 = 1;
 }
 
+void mat4_setortho(float l, float r, float b, float t, float n, float f, Mat4* out) {
+	ssr_assert(out);
+	mat4_zero(out);
+	out->e00 = 2 / (r - l);
+	out->e03 = -(r + l) / (r - l);
+	out->e11 = 2 / (t - b);
+	out->e13 = -(t + b) / (t - b);
+	out->e22 = -2 / (f - n);
+	out->e23 = -(f + n) / (f - n);
+	out->e33 = 1;
+}
+
 void mat4_setfrustum(float l, float r, float b, float t, float n, float f, Mat4* out) {
 	ssr_assert(out);
 	mat4_zero(out);