Save viewport matrix in a variable

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);

src/shader/shaders.c

@@ -30,7 +30,6 @@ internal PointLight g_directional_light = {
 internal V3f g_eye = {0.2f, 0.1f, 0.75f};
 internal V3f g_target = {0};
 internal V3f g_up = {0.0f, 1.0f, 0.0f};
-internal M4x4f g_cam_matrix = mat4x4_identity;
 
 internal V3f general_shader_vertex(void *shader, const V3f *vertex);
 internal FragmentResult phong_shader_fragment(void *shader,

src/vec/vec.h

@@ -5,8 +5,6 @@
 #include "typed_list.h"
 #include <math.h>
 
-#define V3_ELEM_COUNT 3
-
 typedef struct i64x2 V2i;
 struct i64x2 {
   i64 x;
@@ -33,7 +31,7 @@ struct f32x2 {
 
 typedef union f32x3 V3f;
 union f32x3 {
-  f32 elements[V3_ELEM_COUNT];
+  f32 elements[3];
   struct {
     union {
       f32 x;
@@ -50,13 +48,16 @@ union f32x3 {
   };
 };
 
-typedef struct f32x4 V4f;
-struct f32x4 {
+typedef union f32x4 V4f;
+union f32x4 {
+  f32 elements[4];
+  struct {
     f32 x;
     f32 y;
     f32 z;
     f32 w;
   };
+};
 
 typedef struct u64x3 V3u;
 struct u64x3 {
@@ -65,20 +66,26 @@ struct u64x3 {
   u64 z;
 };
 
-typedef struct f32_3x3 M3x3f;
-struct f32_3x3 {
+typedef union f32_3x3 M3x3f;
+union f32_3x3 {
+  V3f rows[3];
+  struct {
     V3f row0;
     V3f row1;
     V3f row2;
   };
+};
 
-typedef struct f32_4x4 M4x4f;
-struct f32_4x4 {
+typedef union f32_4x4 M4x4f;
+union f32_4x4 {
+  V4f rows[4];
+  struct {
     V4f row0;
     V4f row1;
     V4f row2;
     V4f row3;
   };
+};
 
 MAKE_LIST_TYPE(V3f);
 MAKE_LIST_TYPE(V2f);
@@ -233,6 +240,8 @@ MAKE_LIST_TYPE(V2f);
 
 #define project_vec4(V) ((V3f){.x = V.x / V.w, .y = V.y / V.w, .z = V.z / V.w})
 
+#define mat_access(MAT, i, j) (MAT.rows[i].elements[j])
+
 M4x4f lookat(V3f eye, V3f target, V3f up);
 M4x4f projection(f32 coeff);
 M4x4f viewport(f32 x, f32 y, u64 w, u64 h);