From 95d474c9565235f6cc34a65f6a9b3b4fa9dd4fd0 Mon Sep 17 00:00:00 2001
From: Abdelrahman <said.abdelrahman89@gmail.com>
Date: Sat, 31 Aug 2024 22:24:04 +0100
Subject: [PATCH] Save viewport matrix in a variable

---
 src/model/render.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/model/render.c b/src/model/render.c
index 6cced8c..14a5967 100644
--- a/src/model/render.c
+++ b/src/model/render.c
@@ -4,6 +4,7 @@
 #include "utils.h"
 #include "vec.h"
 #include <math.h>
+#include <stdio.h>
 
 #define TRIANGLE_VERTICES 3
 
@@ -211,7 +212,8 @@ internal V3f get_barycentric_coords(V3f a, V3f b, V3f c, V3f p) {
 
 internal V3f get_viewport_vertex(const V3f *vertex, const Image *img) {
   V4f vh = {.x = vertex->x, .y = 0.0f - vertex->y, .z = vertex->z, .w = 1.0f};
-  vh = mat4x4_mul_vec4(viewport(vh.x, vh.y, img->width, img->height), vh);
+  M4x4f vp = viewport(vh.x, vh.y, img->width, img->height);
+  vh = mat4x4_mul_vec4(vp, vh);
 
   V3f output = project_vec4(vh);
   output.x = clamp(output.x, 0.0f, img->width);