uv

1 files changed, 57 insertions, 0 deletions

diff --git a/examples/uv.c b/examples/uv.c
new file mode 100644
index 0000000..937c4d5
--- /dev/null
+++ b/examples/uv.c
@@ -0,0 +1,57 @@
+#include <assert.h>
+
+#include "../sponge.h"
+#define SPONGE_EXAMPLE_IMPLEMENTATION
+#define SPONGE_EXAMPLE_INIT_DEFINED
+#define SPONGE_EXAMPLE_MOUSE_MOVE_DEFINED
+#include "../example.h"
+#include "../stb_image.h"
+
+sponge_Texture texture;
+
+int32_t mouse_x;
+int32_t mouse_y;
+
+void init() {
+    unsigned char *data = stbi_load("examples/kot.png", &texture.width, &texture.height, NULL, 4);
+    if (!data) {
+        printf("%s\n", stbi_failure_reason());
+        assert(0);
+    }
+
+    texture.stride_pixels = texture.width;
+    texture.pixels = (sponge_Color32 *)data; // NOTE(kard): be careful if changing following loop
+
+    // converting from stbi's RGBA
+    for (size_t i = 0; i < texture.width * texture.height; i++) {
+        sponge_Color32 result;
+        result.r = data[i * 4 + 0];
+        result.g = data[i * 4 + 1];
+        result.b = data[i * 4 + 2];
+        result.a = data[i * 4 + 3];
+        texture.pixels[i] = result;
+    }
+
+    mouse_x = 100;
+    mouse_y = 100;
+}
+
+void mouse_move(int32_t x, int32_t y) {
+    mouse_x = x;
+    mouse_y = y;
+}
+
+void draw_frame(sponge_Texture c) {
+    sponge_clear(c, sponge_color32_make(0xFF000000));
+    sponge_Vec2I v0 = sponge_vec2i_make(mouse_x, mouse_y);
+    sponge_Vec2I v1 = sponge_vec2i_make(c.width - 100, 100);
+    sponge_Vec2I v2 = sponge_vec2i_make(100, c.height - 100);
+    sponge_Vec2I v3 = sponge_vec2i_make(c.width - 100, c.height - 100);
+    sponge_Vec2 uv0 = sponge_vec2_make(0.0f, 0.0f);
+    sponge_Vec2 uv1 = sponge_vec2_make(1.0f, 0.0f);
+    sponge_Vec2 uv2 = sponge_vec2_make(0.0f, 1.0f);
+    sponge_Vec2 uv3 = sponge_vec2_make(1.0f, 1.0f);
+
+    sponge_draw_triangle_uv(c, v0, v1, v3, uv0, uv1, uv3, texture);
+    sponge_draw_triangle_uv(c, v0, v3, v2, uv0, uv3, uv2, texture);
+}