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#include <swgfx.h>
#include <assert.h>
#include <stdbool.h>
#include <stdio.h>
typedef struct RGB { uint8_t r, g, b; } RGB;
static bool WritePPM(int width, int height, const RGB* image, const char* path) {
const size_t num_pixels = width * height;
FILE* file = fopen(path, "wb");
if (!file) {
return false;
}
fprintf(file, "P6\n%d %d\n255\n", width, height);
if (fwrite(image, sizeof(RGB), num_pixels, file) != num_pixels) {
fclose(file);
return false;
}
fclose(file);
return true;
}
void ToRGB(int width, int height, const sgPixel* rgba, RGB* rgb) {
assert(rgba);
assert(rgb);
for (int y = 0; y < height; ++y) {
for (int x = 0; x < width; ++x) {
const sgPixel p = *rgba++;
*rgb++ = (RGB){p.r, p.g, p.b};
}
}
}
static void Checkerboard(swgfx* gfx, int width, int height) {
assert(gfx);
const sgPixel colour = (sgPixel){255, 0, 255, 255};
for (int y = 0; y < height; ++y) {
for (int x = 0; x < width; ++x) {
if (((x ^ y) & 1) == 1) {
const sgVec2i position = (sgVec2i){x, y};
sgPixels(gfx, 1, &position, colour);
}
}
}
}
static void TestTriangle(swgfx* gfx) {
assert(gfx);
const int BufferWidth = 160;
const int BufferHeight = 120;
const int N = BufferWidth * BufferHeight;
const sgVec2i BufferDims = (sgVec2i){.x = BufferWidth, .y = BufferHeight};
sgPixel colour[N];
RGB rgb[N];
sgColourBuffer(gfx, BufferDims, colour);
sgClear(gfx);
Checkerboard(gfx, BufferWidth, BufferHeight);
const sgVec2 p0 = (sgVec2){20, 20};
const sgVec2 p1 = (sgVec2){80, 20};
const sgVec2 p2 = (sgVec2){50, 50};
const sgTri2 tri = (sgTri2){p0, p1, p2};
sgTriangles2(gfx, 1, &tri);
ToRGB(BufferWidth, BufferHeight, colour, rgb);
WritePPM(BufferWidth, BufferHeight, rgb, "triangle.ppm");
}
int main() {
swgfx* gfx = 0;
if (!(gfx = sgNew())) {
fprintf(stderr, "Failed to create swgfx\n");
return 1;
}
TestTriangle(gfx);
sgDel(&gfx);
return 0;
}
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