5
मैं बस सोच रहा हूं कि मैं एक एसडीएल_Surface (IMG_Load के माध्यम से एक पीएनजी से लोड) कैसे परिवर्तित कर सकता हूं और इसे एक ट्रैक्टर पर चिपका सकता हूं। यहां मेरे पास है (ज्यादातर मुझे मिले ट्यूटोरियल से चिपकाया गया है)।एसडीएल/ओपनजीएल बनावट पारदर्शिता
#include "SDL.h"
#include "SDL_opengl.h"
#include "SDL_image.h"
#include <stdio.h>
int main(int argc, char *argv[])
{
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); // *new*
screen = SDL_SetVideoMode(640, 480, 16, SDL_OPENGL); // *changed*
if (!screen) {
printf("Unable to set video mode: %s\n", SDL_GetError());
return 1;
}
// 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();
// Load the OpenGL texture
GLuint texture; // Texture object handle
SDL_Surface *surface; // Gives us the information to make the texture
if ((surface = IMG_Load("img/star.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 height is not a power of 2\n");
}
// 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);
// Edit the texture object's image data using the information SDL_Surface gives us
glTexImage2D(GL_TEXTURE_2D, 0, 3, surface->w, surface->h, 0,
GL_RGBA, 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);
}
// Clear the screen before drawing
glClear(GL_COLOR_BUFFER_BIT);
// Bind the texture to which subsequent calls refer to
glBindTexture(GL_TEXTURE_2D, texture);
glColor3f(1,0,0);
glDisable(GL_TEXTURE_2D);
glBegin(GL_QUADS);
// Top-left vertex (corner)
glTexCoord2i(0, 0);
glVertex3f(0, 0, 0);
// Bottom-left vertex (corner)
glTexCoord2i(1, 0);
glVertex3f(328, 0, 0);
// Bottom-right vertex (corner)
glTexCoord2i(1, 1);
glVertex3f(328, 328, 0);
// Top-right vertex (corner)
glTexCoord2i(0, 1);
glVertex3f(0, 328, 0);
glEnd();
glColor3f(1,1,1);
glEnable(GL_TEXTURE_2D);
glBegin(GL_QUADS);
// Top-left vertex (corner)
glTexCoord2i(0, 0);
glVertex3f(100, 100, 0);
// Bottom-left vertex (corner)
glTexCoord2i(1, 0);
glVertex3f(228, 100, 0);
// Bottom-right vertex (corner)
glTexCoord2i(1, 1);
glVertex3f(228, 228, 0);
// Top-right vertex (corner)
glTexCoord2i(0, 1);
glVertex3f(100, 228, 0);
glEnd();
SDL_GL_SwapBuffers();
// Wait for 3 seconds to give us a chance to see the image
SDL_Delay(3000);
// Now we can delete the OpenGL texture and close down SDL
glDeleteTextures(1, &texture);
SDL_Quit();
return 0;
}
बनावट प्रस्तुत करता है, लेकिन जहां पारदर्शिता होनी चाहिए, वहां केवल काला है।
अगली बार कोड के बड़े ब्लॉक के लिए कोड नमूना बटन का उपयोग करें। – genpfault