diff options
Diffstat (limited to 'examples')
| -rw-r--r-- | examples/matrix.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/examples/matrix.c b/examples/matrix.c new file mode 100644 index 0000000..0b0ac91 --- /dev/null +++ b/examples/matrix.c @@ -0,0 +1,30 @@ +#include "../sponge.h" +#define SPONGE_EXAMPLE_IMPLEMENTATION +#include "../example.h" + +#define PI ((float)3.14159265358979323846) +#define SPEED ((1.0f / 360.0f) * 2 * PI) +static float angle = 0.0f; + +void draw_frame(sponge_Texture c) { + sponge_clear(c, sponge_color32_make(0xFF000000)); + angle += SPEED; + sponge_Vec3 v0 = sponge_vec3_make(0.0f, -0.8f, 0.0f); + sponge_Vec3 v1 = sponge_vec3_make(0.8f, 0.8f, 0.0f); + sponge_Vec3 v2 = sponge_vec3_make(-0.8f, 0.8f, 0.0f); + + sponge_Mat4 m = sponge_mat4_rotate(sponge_vec3_make(0.0f, 0.0f, angle)); + m = sponge_mat4_mul_mat4(m, sponge_mat4_translate(sponge_vec3_make(1.0f, 1.0f, 0.0f))); + m = sponge_mat4_mul_mat4(m, sponge_mat4_scale(sponge_vec3_make((float)(c.width / 2), (float)(c.height / 2), 1.0f))); + + v0 = sponge_vec3_mul_mat4(v0, m); + v1 = sponge_vec3_mul_mat4(v1, m); + v2 = sponge_vec3_mul_mat4(v2, m); + + sponge_draw_triangle_col3( + c, + sponge_vec2i_make((int32_t)v0.x, (int32_t)v0.y), + sponge_vec2i_make((int32_t)v1.x, (int32_t)v1.y), + sponge_vec2i_make((int32_t)v2.x, (int32_t)v2.y), + sponge_colorf_make(0xFFFF0000), sponge_colorf_make(0xFF00FF00), sponge_colorf_make(0xFF0000FF)); +} |