void Adafruit_NeoPixel::show() {
initializeSdl();
for (int n = 0; n < numberOfPixels; n++) {
EmuPixel& epix = emuPixels[n];
uint32_t rgb = pixels[n];
int r = rgb >> 16;
int g = rgb >> 8 & 0xff;
int b = rgb & 0xff;
SDL_Rect rect;
rect.x = epix.x;
rect.y = epix.y;
rect.w = epix.width;
rect.h = epix.height;
SDL_FillRect(
screenSurface,
&rect,
SDL_MapRGB(screenSurface->format,r,g,b)
);
} // for pixels
SDL_UpdateWindowSurface(window);
quitOnKey();
} // show()
int main(int argc, char *argv[])
{
if (initializeSdl()) {
// Exercise: Without the depth test, which primitive is on top?
glEnable(GL_DEPTH_TEST);
#if USE_PROJECTION_MATRIX
glMatrixMode(GL_PROJECTION);
GLdouble ratio = 640.0f / 480.0f;
glOrtho(-ratio, ratio, -1, 1, -1, 1);
#endif
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
// With no projection matrix, these are window coordinates,
// which are left-handed. (.5 is farther away than 0) The projection
// matrices generated by the gl functions have a negative z factor
// (see https://www.opengl.org/sdk/docs/man2/xhtml/glOrtho.xml)
// which effectively gives us a right-handed coordinate system
// (.5 is closer than 0)
drawSquareAt(0, 0, 0);
drawSquareAt(0.5, 0.5, 0.5);
SDL_GL_SwapBuffers();
SDL_Delay(3000);
SDL_Quit();
}
return 0;
}
int main(int argc, char *argv[])
{
if (initializeSdl()) {
// Tell GL what matrix we want to modify
glMatrixMode(GL_PROJECTION);
// Orthographic projection, which ignores depth.
GLdouble ratio = 640.0f / 480.0f;
glOrtho(-ratio, ratio, -1, 1, -1, 1);
glClear(GL_COLOR_BUFFER_BIT);
drawSquare();
SDL_GL_SwapBuffers();
SDL_Delay(2000);
SDL_Quit();
}
return 0;
}
