examples/triangles.c


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#include "../sponge.h"

#define SPEED_ABS (2)
#define GRID_SIZE (10)


static int32_t offset = 0;
static int32_t speed = SPEED_ABS;

void init() {}

void draw_frame(sponge_Texture c) {
    sponge_clear(c, 0xFF000000);
    offset += speed;

    if (offset > 30) {
        speed = -SPEED_ABS;
    } else if (offset < -30) {
        speed = SPEED_ABS;
    }

    int32_t offset_x = c.width / GRID_SIZE;
    int32_t offset_y = c.height / GRID_SIZE;

    for (int i = 0; i < GRID_SIZE; i++) {
        for (int j = 0; j < GRID_SIZE; j++) {
            int32_t x = i * offset_x;
            int32_t y = j * offset_y + offset;

        sponge_draw_triangle_col3(
            c,
            x, y + offset_y,
            x + offset_x, y,
            x + (offset_x * 3 / 4), y + (offset_y * 3 / 4),
            0xFFFF0000, 0xFF00FF00, 0xFF0000FF);
        }
    }
}