restructure zephr

zephr_math.h

@@ -0,0 +1,50 @@
+#pragma once
+
+typedef struct {
+    float m[4][4];
+} Matrix4x4;
+
+typedef struct Size {
+  int width;
+  int height;
+} Size;
+
+typedef struct Sizef {
+  float width;
+  float height;
+} Sizef;
+
+typedef struct Vec2 {
+  int x;
+  int y;
+} Vec2;
+
+typedef struct Vec2f {
+  float x;
+  float y;
+} Vec2f;
+
+typedef struct Vec4f {
+  float x;
+  float y;
+  float z;
+  float w;
+} Vec4f;
+
+typedef struct Color {
+  float r;
+  float g;
+  float b;
+  float a;
+} Color;
+
+int max(int a, int b);
+float maxf(float a, float b);
+float clampf(float value, float min, float max);
+float to_radians(float degrees);
+Matrix4x4 identity();
+void mult_4x4(Matrix4x4 *multiplicant, Matrix4x4 *multiplier);
+void apply_scale(Matrix4x4 *matrix, Sizef scale);
+void apply_rotation(Matrix4x4 *model, float angle);
+void apply_translation(Matrix4x4 *matrix, Vec2f pos);
+Matrix4x4 orthographic_projection_2d(float left, float right, float bottom, float top);