Pre-multiply V and P matrices

main.c

@@ -12,7 +12,7 @@
 
 #define DT (1'000'000 / 60) // Assume 60 Hz for now
 
-#define LIL_GUY_COUNT 2
+#define NELEMS(arr) (sizeof(arr) / sizeof(arr[0]))
 
 static void
 key_callback(GLFWwindow *window, int key, int scancode, int action, int mods)
@@ -59,11 +59,10 @@ int main(int argc, char *argv[])
 
 	const vec3_t cam = { 0, 4, -8 };
 	const vec3_t tgt = { 0, 0, 0 };
-	const vp_t vp = {
-		.view = mat4_lookat(cam, tgt, (vec3_t) { 0, 1, 0 }),
-		.proj = mat4_perspective((float)W / H, PI / 8, 0.1, 100.0),
-	};
-	mat4_t transforms[] = {
+	const mat4_t view = mat4_lookat(cam, tgt, (vec3_t) { 0, 1, 0 });
+	const mat4_t proj = mat4_perspective((float)W / H, PI / 8, 0.1, 100.0);
+	const mat4_t vp = mat4_mul(proj, view);
+	mat4_t transforms[NELEMS(gpu_models)] = {
 		mat4_mul(
 		    MAT4_TRANSLATE(1, 0, 0),
 		    (mat4_t) {
@@ -96,9 +95,13 @@ int main(int argc, char *argv[])
 
 		animation_update(&anim, &model, DT);
 
-		const mat4_t *bone_matrices[]
-		    = { anim.bone_matrices, anim.bone_matrices };
-		gpu_render(&gpu, vp, 2, gpu_models, bone_matrices, transforms);
+		const mat4_t *bone_matrices[NELEMS(gpu_models)] = {
+			anim.bone_matrices,
+			anim.bone_matrices,
+		};
+		gpu_render(
+		    &gpu, vp, NELEMS(gpu_models), gpu_models, bone_matrices,
+		    transforms);
 	}
 
 	// Clean up