更新纹理 [英] update texture

问题描述

嗨:)

有一个函数可以生成纹理:void Render(char * Img);
在openGL的初始化中:

glutInit(&argc, argv);
glutInitWindowSize(w, h);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);
glutCreateWindow("triunghi");
glutDisplayFunc(afis);
glutIdleFunc(idle);

glClearColor(0, 0, 0, 0);
glEnable( GL_TEXTURE_2D );
texture=LoadTexture();

LoadTexture在哪里

glGenTextures( 1, &texture );
glBindTexture( GL_TEXTURE_2D, texture );
glTexEnvf( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE );
glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST );
glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, false ? GL_REPEAT : GL_CLAMP );
glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, false ? GL_REPEAT : GL_CLAMP

并在绘图功能中

glClear(GL_COLOR_BUFFER_BIT);
glLoadIdentity();

glEnable( GL_TEXTURE_2D );
glBindTexture( GL_TEXTURE_2D, texture );
gluBuild2DMipmaps(  GL_TEXTURE_2D, 3, w, h, GL_RGB, GL_UNSIGNED_BYTE, Img);

glBegin(GL_QUADS);
        glTexCoord2d(0.0,0.0); glVertex2d(-1.0,-1.0);
        glTexCoord2d(1.0,0.0); glVertex2d(1.0,-1.0);
        glTexCoord2d(1.0,1.0); glVertex2d(1.0,1.0);
        glTexCoord2d(0.0,1.0); glVertex2d(-1.0,1.0);
glEnd();
glutSwapBuffers();

空闲时，将更新Img中的数据，并调用glutPostRedisplay.
麻烦的是，仅显示第一个纹理，在下一帧更新的图像顶部仅显示10％，之后纹理是静态的.可以移动对象，但纹理相同.
即使分配了新的纹理编号并释放了旧的纹理编号，也会发生相同的情况.
Img已正确更新，因为它也已写入可以的文件中.

我做错了什么?

谢谢:)

解决方案

对不起，问题出在缓冲区中，它没有正确更新...

Hi :)

There is function that generates a texture: void Render(char* Img);
At the init of openGL:

glutInit(&argc, argv);
glutInitWindowSize(w, h);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);
glutCreateWindow("triunghi");
glutDisplayFunc(afis);
glutIdleFunc(idle);

glClearColor(0, 0, 0, 0);
glEnable( GL_TEXTURE_2D );
texture=LoadTexture();

where LoadTexture is

glGenTextures( 1, &texture );
glBindTexture( GL_TEXTURE_2D, texture );
glTexEnvf( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE );
glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST );
glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, false ? GL_REPEAT : GL_CLAMP );
glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, false ? GL_REPEAT : GL_CLAMP

and in the drawing function

glClear(GL_COLOR_BUFFER_BIT);
glLoadIdentity();

glEnable( GL_TEXTURE_2D );
glBindTexture( GL_TEXTURE_2D, texture );
gluBuild2DMipmaps(  GL_TEXTURE_2D, 3, w, h, GL_RGB, GL_UNSIGNED_BYTE, Img);

glBegin(GL_QUADS);
        glTexCoord2d(0.0,0.0); glVertex2d(-1.0,-1.0);
        glTexCoord2d(1.0,0.0); glVertex2d(1.0,-1.0);
        glTexCoord2d(1.0,1.0); glVertex2d(1.0,1.0);
        glTexCoord2d(0.0,1.0); glVertex2d(-1.0,1.0);
glEnd();
glutSwapBuffers();

in idle, the data in Img is updated, and glutPostRedisplay is called.
The trouble is that only the first texture is displayed, at the next frame only 10% at the top of the image updated and after that the texture is static. The object can be moved, but the texture is the same.
The same thing happens even if a new texture number is assigned and the old one freed.
The Img is updated correctly, because it is also written to a file which is ok.

What am I doing wrong?

Thank you :)

解决方案

Sorry, the problem was in the buffer, it didn''t update correctly...

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