SDL not rendering (Linux, i3wm) - c++

Question

Im trying to just render some pixels to the screen, the window appears but its just all black. (My guess is that it's i3-wm doing something weird with X11/SDL?). Also im using Ubuntu 16.10, SDL 2.2, compiling with gcc, debugging with gbd.
Maybe I'm just missing something from the SDL docs.
Code:
#include "SDL.h"
#include <stdio.h>
#include <stdint.h>
#include <sys/mman.h>
typedef int8_t int8;
typedef int16_t int16;
typedef int32_t int32;
typedef int64_t int64;
typedef uint8_t uint8;
typedef uint16_t uint16;
typedef uint32_t uint32;
typedef uint64_t uint64;
// Temp?
#define internal static
#define local_persist static
#define global_variable static
global_variable SDL_Texture *Texture;
global_variable void *BitmapMemory; //Pixels
global_variable int BitmapWidth; //Texture Width
global_variable int BitmapHeight; //Texture Width
global_variable int BytesPerPixel = 4;
bool HandleEvent(SDL_Event*);
// Backbuffer Functions.
internal void SDLResizeTexture(SDL_Renderer*, int, int);
internal void SDLUpdateWindow(SDL_Window*, SDL_Renderer*);
internal void RenderGradient(int, int);
int main(int argc, char *argv[]){
SDL_Init(SDL_INIT_VIDEO);
// Create Window.
SDL_Window *Window = SDL_CreateWindow("The Origin Of Evil",
SDL_WINDOWPOS_UNDEFINED,
SDL_WINDOWPOS_UNDEFINED,
640, 480,
SDL_WINDOW_RESIZABLE);
if(Window){
// Create Renderer.
SDL_Renderer *Renderer = SDL_CreateRenderer(Window, -1, 0);
if(Renderer){
bool Running = true;
int Width, Height;
SDL_GetWindowSize(Window, &Width, &Height);
SDLResizeTexture(Renderer, Width, Height);
int XOffset = 0;
int YOffset = 0;
while(Running){
SDL_Event Event;
while(SDL_PollEvent(&Event)){
if(HandleEvent(&Event)){
Running = false;
}
}
RenderGradient(XOffset, YOffset);
SDLUpdateWindow(Window, Renderer);
++XOffset;
YOffset += 2;
}
}else{
//TODO: Logging
printf("No Renderer.\n");
}
}else{
//TODO: Logging
printf("No Window.\n");
}
SDL_Quit();
return 0;
}
// True if we want to quit the program.
bool HandleEvent(SDL_Event *Event){
bool ShouldQuit = false;
switch (Event->type) {
case SDL_QUIT:
{
printf("SDL_Quit\n") ;
ShouldQuit = true;
}break;
case SDL_WINDOWEVENT:
{
switch (Event->window.event) {
case SDL_WINDOWEVENT_SIZE_CHANGED:
{
printf("SDL_WINDOWEVENT_SIZE_CHANGED\n");
SDL_Window *Window = SDL_GetWindowFromID(Event->window.windowID);
SDL_Renderer * Renderer = SDL_GetRenderer(Window);
SDLResizeTexture(Renderer, Event->window.data1, Event->window.data2);
}break;
case SDL_WINDOWEVENT_FOCUS_GAINED:
{
printf("SDL_WINDOWEVENT_FOCUS_GAINED\n");
}break;
case SDL_WINDOWEVENT_EXPOSED:
{
SDL_Window *Window = SDL_GetWindowFromID(Event->window.windowID);
SDL_Renderer *Renderer = SDL_GetRenderer(Window);
SDLUpdateWindow(Window, Renderer);
}break;
}
}break;
}
return(ShouldQuit);
}
internal void SDLResizeTexture(SDL_Renderer *Renderer, int Width, int Height){
if(BitmapMemory){
munmap(BitmapMemory, BitmapWidth * BitmapHeight * BytesPerPixel);
}
if(Texture){
SDL_DestroyTexture(Texture);
}
Texture = SDL_CreateTexture(Renderer, SDL_PIXELFORMAT_ARGB8888,
SDL_TEXTUREACCESS_STREAMING,
Width,
Height);
BitmapWidth = Width;
BitmapHeight = Height;
BitmapMemory = mmap(0,
Width * Height * BytesPerPixel,
PROT_READ | PROT_WRITE,
MAP_ANONYMOUS | MAP_PRIVATE,
-1,
0);
}
internal void SDLUpdateWindow(SDL_Window *Window, SDL_Renderer *Renderer){
SDL_UpdateTexture(Texture, 0, BitmapMemory, BitmapWidth * BytesPerPixel);
SDL_RenderCopy(Renderer, Texture, 0, 0);
SDL_RenderPresent(Renderer);
}
internal void RenderGradient(int BlueOffset, int GreenOffset){
int Width = BitmapWidth;
int Height = BitmapHeight;
int Pitch = Width * BytesPerPixel;
uint8 *Row = (uint8 *)BitmapMemory;
for(int Y = 0; Y > BitmapHeight; ++Y){
uint32 *Pixel = (uint32 *)Row;
for (int X = 0; X < BitmapWidth; ++X) {
uint8 Blue = (X + BlueOffset);
uint8 Green = (Y + GreenOffset);
*Pixel++ = ((Green << 8) | Blue);
}
Row += Pitch;
}
}

Answer 1

for(int Y = 0; Y > BitmapHeight; ++Y) loop wouldn't execute even once. I suppose it meant to be <.