[c++][OpenGL]Obsługa spritów i wyświetlanie fragmenu bitmapy Opcje

[qba10]

Witam
Szukam jakiegoś tutka, kodu, dokumentacji, czegokolwiek w którym wykorzystuje się wyświetlanie textur za pomocą fragmentów bitmap.

[qba10]

Nie wiem jakiej używam wersji OpenGL (IMG:style_emoticons/default/tongue.gif)

To jest kod (taki tam testowy do ogarnięcia wyświetlania textur) w którym wyświetlam textur.

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#include <SDL/SDL.h>
#include <SDL/SDL_image.h>
#include <SDL/SDL_opengl.h>
#include <stdlib.h>
#include <stdio.h>
GLuint texture = NULL; //this is a handle to our texture object
GLenum texture_format = NULL;
GLint nofcolors;
 
SDL_Event event;
 
int loadImage() {
	SDL_Surface *surface; // this surface will tell us the details of the image
 
	if ((surface = IMG_Load("/home/qba/cpp/opengl/Debug/spr.png"))) {
 
		// Check that the image’s width is a power of 2
		if ( (surface->w & (surface->w - 1)) != 0 ) {
			printf("warning: image.bmp's width is not a power of 2\n");
		}
 
		// Also check if the height is a power of 2
		if ( (surface->h & (surface->h - 1)) != 0 ) {
			printf("warning: image.bmp's width is not a power of 2\n");
		}
 
		//get number of channels in the SDL surface
		 nofcolors = surface->format->BytesPerPixel;
 
		//contains an alpha channel
		if (nofcolors == 4) {
			if (surface->format->Rmask == 0x000000ff)
				texture_format = GL_RGBA;
			else
				texture_format = GL_BGRA;
		} else if (nofcolors == 3) //no alpha channel
		{
			if (surface->format->Rmask == 0x000000ff)
				texture_format = GL_RGB;
			else
				texture_format = GL_BGR;
		} else {
			printf("warning: the image is not truecolor…this will break ");
		}
 
		// Have OpenGL generate a texture object handle for us
		glGenTextures(1, &texture);
 
		// Bind the texture object
		glBindTexture(GL_TEXTURE_2D, texture);
 
		// Set the texture’s stretching properties
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 
		glTexImage2D(GL_TEXTURE_2D, 0, nofcolors, surface->w, surface->h-50, 0,
				texture_format, GL_UNSIGNED_BYTE, surface->pixels);
	} else {
		printf("SDL could not load image.bmp: %s\n", SDL_GetError());
		SDL_Quit();
		return 1;
	}
 
	// Free the SDL_Surface only if it was successfully created
	if (surface) {
		SDL_FreeSurface(surface);
	}
}
 
void drawImage() {
 
	// Clear the screen before drawing
	glClear(GL_COLOR_BUFFER_BIT);
 
	// Bind the texture to which subsequent calls refer to
	glBindTexture(GL_TEXTURE_2D, texture);
 
	glBegin(GL_QUADS);
	// Top-left vertex (corner)
	glTexCoord2i(0, 0);
	glVertex3f(0, 0, 0);
 
	// Bottom-left vertex (corner)
	glTexCoord2i(1, 0);
	glVertex3f(0, 100, 0);
 
	// Bottom-right vertex (corner)
	glTexCoord2i(1, 1);
	glVertex3f(100,100, 0);
 
	// Top-right vertex (corner)
	glTexCoord2i(0, 1);
	glVertex3f(100, 0, 0);
	glEnd();
	glBegin(GL_QUADS);
	// Top-left vertex (corner)
	glTexCoord2i(0, 0);
	glVertex3f(100, 0, 0);
 
	// Bottom-left vertex (corner)
	glTexCoord2i(1, 0);
	glVertex3f(100, 100, 0);
 
	// Bottom-right vertex (corner)
	glTexCoord2i(1, 1);
	glVertex3f(200,100, 0);
 
	// Top-right vertex (corner)
	glTexCoord2i(0, 1);
	glVertex3f(200, 0, 0);
	glEnd();
	glLoadIdentity();
	SDL_GL_SwapBuffers();
}
 
int init() {
	SDL_Surface *screen;
 
	// Slightly different SDL initialization
	if (SDL_Init(SDL_INIT_VIDEO) != 0) {
		printf("Unable to initialize SDL: %s\n", SDL_GetError());
		return 1;
	}
 
	SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
 
	screen = SDL_SetVideoMode(640, 480, 16, SDL_OPENGL | SDL_RESIZABLE);
	if (!screen) {
		printf("Unable to set video mode: %s\n", SDL_GetError());
		return 1;
	}
}
 
void init_GL() {
	// Set the OpenGL state after creating the context with SDL_SetVideoMode
 
	glClearColor(0, 0, 0, 0);
 
	glEnable(GL_TEXTURE_2D); // Need this to display a texture
 
	glViewport(0, 0, 640, 480);
 
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
 
	glOrtho(0, 640, 480, 0, -1, 1);
 
	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
}
 
void clean_up() {
	glDeleteTextures(1, &texture);
 
	SDL_Quit();
}
 
int main(int argc, char *argv[]) {
	//Make sure the program waits for a quit
	bool quit = false;
 
	init();
	init_GL();
	loadImage();
	drawImage();
 
	while (quit == false) {
		if (SDL_PollEvent(&event)) {
			//If a key was pressed
			if (event.type == SDL_KEYDOWN) {
				//Adjust the velocity
				switch (event.key.keysym.sym) {
				case SDLK_ESCAPE:
					quit = true;
					break;
				default:
					;
				}
			}
 
		}
	}
	clean_up();
}
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