1 files changed, 48 insertions, 0 deletions
diff --git a/examples/perspective.c b/examples/perspective.c
new file mode 100644
index 0000000..5a2e68a
--- /dev/null
+++ b/examples/perspective.c
@@ -0,0 +1,48 @@
+#include "../sponge.h"
+#define SPONGE_EXAMPLE_IMPLEMENTATION
+#define SPONGE_EXAMPLE_MOUSE_MOVE_DEFINED
+#define SPONGE_EXAMPLE_DRAW_FRAME_3D_DEFINED
+#include "../example.h"
+
+#define FOV (60.0f / PI * 2.0f)
+
+static int32_t mouse_x;
+static int32_t mouse_y;
+
+void mouse_move(int32_t x, int32_t y) {
+    mouse_x = x;
+    mouse_y = y;
+}
+
+void draw_frame_3d(sponge_Texture c, float *depths) {
+    sponge_clear_3d(c, depths, sponge_color32_make(0xFF000000));
+
+    sponge_Vec3 positions[] = {
+        sponge_vec3_make(-0.5f,  0.5f, 0.0f),
+        sponge_vec3_make( 0.5f,  0.5f, 0.0f),
+        sponge_vec3_make(-0.5f, -0.5f, 0.0f),
+        sponge_vec3_make( 0.5f, -0.5f, 0.0f),
+    };
+
+    sponge_Color32 colors[] = {
+        sponge_color32_make(0xFF00FFFF),
+        sponge_color32_make(0xFFFFFFFF),
+        sponge_color32_make(0xFF0000FF),
+        sponge_color32_make(0xFFFF00FF),
+    };
+
+    int32_t triangles[] = {
+        0, 1, 2,
+        2, 1, 3,
+    };
+
+    sponge_Mat4 model = sponge_mat4_identity();
+    model = sponge_mat4_mul_mat4(model, sponge_mat4_rotate(
+        (float)(mouse_y - ((int32_t)c.height / 2)) / (float)c.height * PI,
+        (float)(mouse_x - ((int32_t)c.width / 2)) / (float)c.width * PI,
+        0.0f));
+    model = sponge_mat4_mul_mat4(model, sponge_mat4_translate(0.0f, 0.0f, -5.0f));
+    sponge_Mat4 view = sponge_mat4_identity();
+    sponge_Mat4 proj = sponge_mat4_projection(FOV, (float)c.width / (float)c.height, 1.0f, 10.0f);
+    sponge_draw_mesh_col(c, depths, model, view, proj, positions, colors, triangles, 6);
+}