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Diffstat (limited to 'examples/cube.c')
| -rw-r--r-- | examples/cube.c | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/examples/cube.c b/examples/cube.c new file mode 100644 index 0000000..240c387 --- /dev/null +++ b/examples/cube.c @@ -0,0 +1,136 @@ +#include <assert.h> + +#include "../sponge.h" +#define SPONGE_EXAMPLE_IMPLEMENTATION +#define SPONGE_EXAMPLE_INIT_DEFINED +#define SPONGE_EXAMPLE_MOUSE_MOVE_DEFINED +#define SPONGE_EXAMPLE_DRAW_FRAME_3D_DEFINED +#include "../example.h" + +#include "../stb_image.h" + +#define FOV (60.0f / PI * 2.0f) +#define DISTANCE (10.0f) + +static sponge_Texture texture; +static int32_t mouse_x; +static int32_t mouse_y; + +void init() { + unsigned char *data = stbi_load("examples/kothd.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; + } +} + +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)); + + // NOTE(kard): these directions are not intuitive at all, but it works + sponge_Vec3 positions[] = { + // front + sponge_vec3_make( 0.5f, 0.5f, -0.5f), + sponge_vec3_make(-0.5f, 0.5f, -0.5f), + sponge_vec3_make( 0.5f, -0.5f, -0.5f), + sponge_vec3_make(-0.5f, -0.5f, -0.5f), + // right + sponge_vec3_make(-0.5f, 0.5f, -0.5f), + sponge_vec3_make(-0.5f, 0.5f, 0.5f), + sponge_vec3_make(-0.5f, -0.5f, -0.5f), + sponge_vec3_make(-0.5f, -0.5f, 0.5f), + // left + sponge_vec3_make( 0.5f, 0.5f, 0.5f), + sponge_vec3_make( 0.5f, 0.5f, -0.5f), + sponge_vec3_make( 0.5f, -0.5f, 0.5f), + sponge_vec3_make( 0.5f, -0.5f, -0.5f), + // top + sponge_vec3_make( 0.5f, 0.5f, 0.5f), + sponge_vec3_make(-0.5f, 0.5f, 0.5f), + sponge_vec3_make( 0.5f, 0.5f, -0.5f), + sponge_vec3_make(-0.5f, 0.5f, -0.5f), + // bottom + sponge_vec3_make(-0.5f, -0.5f, 0.5f), + sponge_vec3_make( 0.5f, -0.5f, 0.5f), + sponge_vec3_make(-0.5f, -0.5f, -0.5f), + sponge_vec3_make( 0.5f, -0.5f, -0.5f), + // there is no back + }; + // NOTE(kard): do not ask any questions + sponge_Vec2 uvs[] = { + // front + sponge_vec2_make(0.33f, 0.33f), + sponge_vec2_make(0.66f, 0.33f), + sponge_vec2_make(0.33f, 0.66f), + sponge_vec2_make(0.66f, 0.66f), + // right + sponge_vec2_make(0.66f, 0.33f), + sponge_vec2_make(1.00f, 0.00f), + sponge_vec2_make(0.66f, 0.66f), + sponge_vec2_make(1.00f, 1.00f), + // left + sponge_vec2_make(0.00f, 0.00f), + sponge_vec2_make(0.33f, 0.33f), + sponge_vec2_make(0.00f, 1.00f), + sponge_vec2_make(0.33f, 0.66f), + // top + sponge_vec2_make(0.00f, 0.00f), + sponge_vec2_make(1.00f, 0.00f), + sponge_vec2_make(0.33f, 0.33f), + sponge_vec2_make(0.66f, 0.33f), + // bottom + sponge_vec2_make(0.00f, 1.00f), + sponge_vec2_make(1.00f, 1.00f), + sponge_vec2_make(0.33f, 0.66f), + sponge_vec2_make(0.66f, 0.66f), + }; + + int32_t triangles[] = { + // front + 0, 1, 2, + 2, 1, 3, + // right + 4, 5, 6, + 6, 5, 7, + // left + 8, 9, 10, + 10, 9, 11, + // top + 12, 13, 14, + 14, 13, 15, + // bottom + 16, 17, 18, + 18, 17, 19, + }; + + + sponge_Mat4 model = sponge_mat4_identity(); + + float rot_y = (float)mouse_x / (float)c.width * PI * 2.0f; + float rot_x = ((float)mouse_y / (float)c.height * PI) - (PI * 0.5f); + sponge_Mat4 view = sponge_mat4_identity(); + view = sponge_mat4_mul_mat4(view, sponge_mat4_rotate(rot_x, rot_y, 0.0f)); + view = sponge_mat4_mul_mat4(view, sponge_mat4_translate(0.0f, 0.0f, -5.0f)); + + sponge_Mat4 proj = sponge_mat4_projection(FOV, (float)c.width / (float)c.height, 1.0f, 100.0f); + + sponge_draw_mesh_uv(c, depths, model, view, proj, positions, uvs, triangles, 30, texture); +} |