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#include <stdint.h>
typedef struct {
uint32_t *pixels; // AARRGGBB
uint32_t width;
uint32_t height;
uint32_t stride;
} sponge_Texture;
int sponge_canvas_valid(sponge_Texture c);
void sponge_clear (sponge_Texture c, uint32_t color);
void sponge_draw_rect (sponge_Texture c, uint32_t x0, uint32_t y0, uint32_t x1, uint32_t y1, uint32_t color);
void sponge_draw_texture(sponge_Texture c, uint32_t x0, uint32_t y0, sponge_Texture tex);
// TODO(kard): prefix stripping
#ifdef SPONGE_IMPLEMENTATION
// can be defined as nop in release builds
#ifndef SPONGE_ASSERT
#include <assert.h>
#define SPONGE_ASSERT(x) assert(x)
#endif // SPONGE_ASSERT
int sponge_canvas_valid(sponge_Texture c) {
return c.width != 0 && c.height != 0;
}
void sponge_clear(sponge_Texture c, uint32_t color) {
SPONGE_ASSERT(sponge_canvas_valid(c));
sponge_draw_rect(c, 0, 0, c.width - 1, c.height - 1, color);
}
// TODO(kard): probably bounds checking
// TODO(kard): alpha blending maybe
void sponge_draw_rect(sponge_Texture c, uint32_t x0, uint32_t y0, uint32_t x1, uint32_t y1, uint32_t color) {
SPONGE_ASSERT(sponge_canvas_valid(c));
uint32_t *row = c.pixels + (y0 * c.stride);
for (uint32_t y = y0; y <= y1; y++, row += c.stride) {
for (uint32_t x = x0; x <= x1; x++) {
row[x] = color;
}
}
}
void sponge_draw_texture(sponge_Texture c, uint32_t x0, uint32_t y0, sponge_Texture tex) {
SPONGE_ASSERT(sponge_canvas_valid(c));
uint32_t *row_dst = c.pixels + (y0 * c.stride);
uint32_t *row_src = tex.pixels;
uint32_t x1 = x0 + tex.width;
uint32_t y1 = y0 + tex.height;
if (x1 >= c.width)
x1 = c.width - 1;
if (y1 >= c.height)
y1 = c.height - 1;
for (uint32_t y = y0; y <= y1; y++, row_src += tex.stride, row_dst += c.stride) {
// TODO(kard): memcpy?
for (uint32_t x = x0, x_src = 0; x <= x1; x++, x_src++) {
row_dst[x] = row_src[x_src];
}
}
}
#endif // SPONGE_IMPLEMENTATION
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