I'm not understanding why I can't get anything rendered to the screen. I have code very similar to this in another program which renders fine, but this program just gives me a blank screen.

Here's my initialization code:

void GRAPHICS::InitGraphics(SDL_Surface* screen, bool fullscreen, int width, int height)
{
	SDL_Init(SDL_INIT_EVERYTHING);

	glClearColor(0.0, 0.0, 0.0, 1.0);
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	gluPerspective(35.0, width / height, 0.2, 500.0);

	//SetScreenAttributes(screen, fullscreen, width, height);
	SDL_SetVideoMode(width, height, 32, SDL_OPENGL);

	glMatrixMode(GL_MODELVIEW);

	glEnable(GL_DEPTH_TEST);
	glEnable(GL_TEXTURE_2D);
	glEnable(GL_BLEND);
		glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
}

And here's my render function:

void GAME::Render()
{
		// ** Clear the screen and translations for a new render ** //
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
	glLoadIdentity();

	glMatrixMode(GL_PROJECTION);
	glOrtho(0, header.scrWidth, header.scrHeight, 0.0, -1.0, 1.0);
	glColor3f(1.0f, 1.0f, 1.0f);

	// 2D drawings here

		// ** Put all Drawing data here ** //

	glLoadIdentity();
	glMatrixMode(GL_MODELVIEW);
	gluPerspective(35.0, (float)header.scrWidth / (float)header.scrHeight, 0.2, 500.0);

	glColor3f(1.0f, 1.0f, 1.0f);

	glBegin(GL_TRIANGLES);
		glVertex3f(0.0f, 0.0f, 0.0f);
		glVertex3f(0.5f, 0.0f, 0.0f);
		glVertex3f(0.0f, 0.5f, 0.0f);
	glEnd();

	SDL_GL_SwapBuffers();
}

I'm sure the fault lies somewhere in one of these functions. I have other code, but for now a simple triangle on the screen would be nice, but I can't even get that. the clear color is black by the way.

Help is greatly appreciated!

You're using glLoadIdentity weirdly, and also you should not use gluPerspective for modelview matrix. Also, you probably want to set the triangle's z to something like -1 so you can actually see it.

Thanks, but I still have a blank screen.

My render function now:

void GAME::Render()
{
		// ** Clear the screen and translations for a new render ** //
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	gluPerspective(35.0, (float)header.scrWidth / (float)header.scrHeight, 0.2, 500.0);

		// ** Put all Drawing data here ** //

	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();

	glColor3f(1.0f, 1.0f, 1.0f);

	glBegin(GL_TRIANGLES);
		glVertex3f(0.0f, 0.0f, 0.0f);
		glVertex3f(0.5f, 0.0f, 0.0f);
		glVertex3f(0.0f, 0.5f, 0.0f);
	glEnd();

	SDL_GL_SwapBuffers();
}

Take Sponji's second sentence as an advice again. Your projection matrix has a visible depth range from Z=-0.2 to Z=-500, and you draw your triangle at Z=0, so it's not visible.

Take Sponji's second sentence as an advice again. Your projection matrix has a visible depth range from Z=-0.2 to Z=-500, and you draw your triangle at Z=0, so it's not visible.

Yeah sorry, I did that and still nothing. I set the z to -5.0 and still blank. sorry for bein such a noob

sorry for bumping, but i really cannot get this working and have no idea why. i have 2 triangles, one at z -5 and z 5, just blank screen -.-

void GAME::Render()
{
		// ** Clear the screen and translations for a new render ** //
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

	glLoadIdentity();
	glMatrixMode(GL_PROJECTION);
	gluPerspective(35.0, 1280 / 720, 0.2, 500.0);

		// ** Put all Drawing data here ** //

	glLoadIdentity();
	glMatrixMode(GL_MODELVIEW);

	glColor3f(1.0f, 1.0f, 1.0f);
	//glPolygonMode( GL_FRONT_AND_BACK, GL_LINE );

	glBegin(GL_TRIANGLES);
		glVertex3f(0.0f, 0.0f, -5.0f);
		glVertex3f(0.5f, 0.0f, -5.0f);
		glVertex3f(0.0f, 0.5f, -5.0f);

		glVertex3f(0.0f, 0.0f, 5.0f);
		glVertex3f(0.5f, 0.0f, 5.0f);
		glVertex3f(0.0f, 0.5f, 5.0f);
	glEnd();

	SDL_GL_SwapBuffers();
}

Edit: Thanks all, working nice now.