爱华网#pragma comment(lib, "glew32.lib")
int window_width=600;int window_height=600;
int pic_width;int pic_height;int size;
GLuint texName;unsigned char *content;
void init(){ glewInit();
glPixelStorei(GL_UNPACK_ALIGNMENT, 1); glGenTextures(1,&texName); glBindTexture(GL_TEXTURE_2D, texName);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER,GL_NEAREST); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,GL_NEAREST); glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, pic_width, pic_height, 0,GL_RGBA, GL_UNSIGNED_BYTE, content);}
void display_func(){ glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluOrtho2D(0.0, 1.0f,0.0, 1.0f);
glViewport(0, 0,window_width, window_height); glClearColor(1.0f, 1.0f,1.0f, 1.0); glClear(GL_COLOR_BUFFER_BIT);
glEnable(GL_TEXTURE_2D); glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE); glBindTexture(GL_TEXTURE_2D, texName);
glBegin(GL_QUADS); glTexCoord2f(0.0f, 1.0f); glVertex2f(0.0f,0.0f); glTexCoord2f(1.0f, 1.0f); glVertex2f(1.0f,0.0f); glTexCoord2f(1.0f, 0.0f); glVertex2f(1.0f,1.0f); glTexCoord2f(0.0f, 0.0f); glVertex2f(0.0f,1.0f); glEnd(); glutSwapBuffers();}
void reshape_func(int width, int height){ window_width=width; window_height=height; glutReshapeWindow(window_width, window_height);}
int main(int argc, char **argv){ FILE* file =fopen("wiki.png", "rb"); png_structp png_ptr =png_create_read_struct(PNG_LIBPNG_VER_STRING, 0, 0, 0); png_infop info_ptr =png_create_info_struct(png_ptr); setjmp(png_jmpbuf(png_ptr)); png_init_io(png_ptr,file); png_read_png(png_ptr,info_ptr, PNG_TRANSFORM_EXPAND, 0);
pic_width =png_get_image_width(png_ptr, info_ptr); pic_height =png_get_image_height(png_ptr, info_ptr); int color_type =png_get_color_type(png_ptr, info_ptr);
size = pic_height *pic_width * 4; int pos = 0; content=(unsigned char*)malloc(sizeof(unsigned char)*size);
png_bytep* row_pointers= png_get_rows(png_ptr, info_ptr);
for(int i=0; i { for(int j=0; j { content[i*pic_width*4+j*4+0]=row_pointers[i][j*4+0]; content[i*pic_width*4+j*4+1]=row_pointers[i][j*4+1]; content[i*pic_width*4+j*4+2]=row_pointers[i][j*4+2]; content[i*pic_width*4+j*4+3]=row_pointers[i][j*4+3]; } }
png_destroy_read_struct(&png_ptr,&info_ptr, 0); fclose(file);
window_width=pic_width; window_height=pic_height;
glutInit(&argc, argv); glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE); glutInitWindowSize(window_width, window_height); glutCreateWindow("Picture");
init();
glutDisplayFunc(display_func); glutReshapeFunc(reshape_func);
glutMainLoop();
free(content);
return 0;}
显示结果
