Model* ModelInitPNG(const char* path) {
Model* model = calloc(1, sizeof(Model));
glEnable(GL_TEXTURE_2D);
GLuint t_id;
glGenTextures(1, &t_id);
FILE* file = fopen(path, "rb");
int size = fseek(file, 0, SEEK_END);
fseek(file, 0, SEEK_SET);
glBindTexture(GL_TEXTURE_2D, t_id);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
unsigned long w, h;
unsigned char c, b;
unsigned char* data = PNGReader(file, size, &w, &h, &c, &b);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, data);
free(data);
Vector3D* vec = calloc(4, sizeof(Vector3D));
vec[1].x = (float)w;
vec[2].y = (float)h;
vec[3].x = (float)w;
vec[3].y = (float)h;
Vector2D* tex = calloc(4, sizeof(Vector2D));
tex[1].x = 1.0;
tex[2].y = 1.0;
tex[3].x = 1.0;
tex[3].y = 1.0;
ModelInitWithVertex(model, 4, vec, NULL, tex, 0, NULL, t_id);
return model;
}
TEST_F(PNGReaderTest, ReadFile)
{
static constexpr unsigned int VALID_WIDTH = 2;
static constexpr unsigned int VALID_HEIGHT = 2;
static constexpr Color VALID_COLORS[VALID_HEIGHT][VALID_WIDTH] = {{Color::red(), Color::yellow()},
{Color::green(), Color::blue()}};
ScopedTempDir temp_dir;
const std::string valid_path = temp_dir.path() / "valid.png";
write_to_file(valid_path, png_data());
Image image = PNGReader().read_file(valid_path);
ASSERT_EQ(VALID_WIDTH, image.width());
ASSERT_EQ(VALID_HEIGHT, image.height());
for (unsigned int y = 0; y < VALID_HEIGHT; y++)
{
for (unsigned int x = 0; x < VALID_WIDTH; x++)
{
Color valid_color = VALID_COLORS[y][x];
Color color = image.read_pixel(x, y);
EXPECT_NEAR(valid_color.r(), color.r(), 1e-100);
EXPECT_NEAR(valid_color.g(), color.g(), 1e-100);
EXPECT_NEAR(valid_color.b(), color.b(), 1e-100);
}
}
const std::string corrupt_path = temp_dir.path() / "corrupt.png";
write_to_file(corrupt_path, corrupt_png_data());
EXPECT_THROW(PNGReader().read_file(corrupt_path), PNGReader::Exception);
const std::string short_path = temp_dir.path() / "short.png";
write_to_file(short_path, short_png_data());
EXPECT_THROW(PNGReader().read_file(short_path), PNGReader::Exception);
EXPECT_THROW(PNGReader().read_file(temp_dir.path() / "does_not_exist.png"), PNGReader::Exception);
}
