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#include <assert.h>
#include "../sponge.h"
#include "../stb_image.h"
#define SPEED_X_ABS 2
#define SPEED_Y_ABS 2
sponge_Texture texture;
int32_t pos_x;
int32_t pos_y;
int32_t speed_x;
int32_t speed_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 = texture.width;
texture.pixels = data; // NOTE(kard): be careful if changing following loop
// converting from stbi's RGBA to ARGB
for (size_t i = 0; i < texture.width * texture.height; i++) {
uint32_t result = 0;
result |= data[i * 4 + 0] << 16; // R
result |= data[i * 4 + 1] << 8; // G
result |= data[i * 4 + 2] << 0; // B
result |= data[i * 4 + 3] << 24; // A
texture.pixels[i] = result;
}
pos_x = 20;
pos_y = 10;
speed_x = SPEED_X_ABS;
speed_y = SPEED_Y_ABS;
}
void draw_frame(sponge_Texture c) {
sponge_clear(c, 0xFF000000);
pos_x += speed_x;
pos_y += speed_y;
if (pos_x < 0) {
pos_x = 0;
speed_x = SPEED_X_ABS;
} else if (pos_x + texture.width > c.width) {
speed_x = -SPEED_X_ABS;
}
if (pos_y < 0) {
pos_y = 0;
speed_y = SPEED_X_ABS;
} else if (pos_y + texture.height > c.height) {
speed_y = -SPEED_Y_ABS;
}
sponge_draw_texture(c, pos_x, pos_y, texture);
}
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