void DrawBitmap(Bitmap &b, Rect& rect, int x, int y)
{
glPushMatrix();
glTranslatef((float)x,(float)y,0);
////enable textures and set up automatic texture coordinate generation
glBindTexture(GL_TEXTURE_2D, b.GetTexture());
glEnable(GL_TEXTURE_2D);
glColor4f(1.0f,1.0f,1.0f,1.0f);
//Define how alpha blending will work and enable alpha blending.
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glEnable(GL_BLEND);
float tx1 = min(1.0f, (float)rect.X / (float)b.GetWidth());
float ty1 = min(1.0f, (float)rect.Y / (float)b.GetHeight());
float q = ((float)(rect.Width)/((float)b.GetWidth()));
float tx2 = min(1.0f, tx1 + q);
float f = (float)(rect.Height)/((float)b.GetHeight());
float ty2 = min(1.0f, (ty1 + f) );
glPolygonMode(GL_FRONT_AND_BACK, GL_POLYGON);
glBegin(GL_QUADS);
glTexCoord2f(tx1, 1-ty1); glVertex2f(0.0f, 0.0f);
glTexCoord2f(tx1, 1-ty2); glVertex2f(0.0f, (float)rect.Height);
glTexCoord2f(tx2, 1-ty2); glVertex2f((float)rect.Width, (float)rect.Height);
glTexCoord2f(tx2, 1-ty1); glVertex2f((float)rect.Width, 0.0f);
glEnd();
glDisable(GL_TEXTURE_2D);
glPopMatrix();
}
void DrawBitmap(Bitmap &b, int x, int y, int w, int h)
{
glPushMatrix();
glTranslatef((float)x,(float)y,0);
////enable textures and set up automatic texture coordinate generation
glBindTexture(GL_TEXTURE_2D, b.GetTexture());
glEnable(GL_TEXTURE_2D);
glColor4f(1.0f,1.0f,1.0f,1.0f);
//Define how alpha blending will work and enable alpha blending.
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glEnable(GL_BLEND);
glPolygonMode(GL_FRONT_AND_BACK, GL_POLYGON);
glBegin(GL_QUADS);
glTexCoord2f(0.0f, 1.0f); glVertex2f(0.0f, 0.0f);
glTexCoord2f(0.0f, 0.0f); glVertex2f(0.0f, (float)h);
glTexCoord2f(1.0f, 0.0f); glVertex2f((float)w, (float)h);
glTexCoord2f(1.0f, 1.0f); glVertex2f((float)w, 0.0f);
glEnd();
glDisable(GL_TEXTURE_2D);
glPopMatrix();
}