From 8af35e5ed10f1b4cbef908948355a2832ea36fbe Mon Sep 17 00:00:00 2001 From: kkard2 Date: Sun, 14 Sep 2025 13:04:56 +0200 Subject: uv --- examples/uv.c | 57 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 57 insertions(+) create mode 100644 examples/uv.c (limited to 'examples') 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 + +#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); +} -- cgit v1.3.1