Hi! :D
I'm making a 2d game, and I want to use OpenGL. I want to load and draw a texture, but it doesn't draw the texture. It does draw the right image size (32x32size at 100x100location draws a 32x32 white square at 100x100), though.
Initialization:
glViewport(0, 0, width, height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0.0f, width, height, 0.0f, -1.0f, 1.0f);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glShadeModel(GL_SMOOTH);
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
glClearDepth(1.0f);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
class CSprite
{
public:
...
bool Load(const char *file); // Load sprite
...
bool Draw(int x, int y); // Draw the sprite
private:
GLuint texture; // Texture data
AUX_RGBImageRec *g_picture; // OGL image data
};
bool CSprite::Load(const char *file)
{
g_picture = auxDIBImageLoad(file);
glGenTextures(1, &texture);
glBindTexture(GL_TEXTURE_2D, texture);
glTexImage2D(GL_TEXTURE_2D, 0, 4, g_picture->sizeX, g_picture->sizeY, 0, GL_RGBA, GL_UNSIGNED_BYTE, g_picture->data);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
// Some debug info
printf("Done loading %s\n", file);
return true;
}
bool CSprite::Draw(int x, int y)
{
glTranslatef(x, y, 0.0f);
glBindTexture(GL_TEXTURE_2D, texture);
glBegin(GL_QUADS);
glTexCoord2f(0,0); glVertex2d(0.0f, 0.0f); // top left
glTexCoord2f(1,0); glVertex2d(g_picture->sizeX, 0.0f); // top right
glTexCoord2f(1,1); glVertex2d(g_picture->sizeX, g_picture->sizeY); // bottom left
glTexCoord2f(0,1); glVertex2d(0.0f, g_picture->sizeY); // bottom right
glEnd();
return true;
}
