OpenGL 2D纹理映射问题

Question

I am relatively new to OpenGL and I am having some issues when I am rendering an image as a texture for a QUAD which is as the same size of the image. Here is my code. I would be very grateful if someone helps me to solve this problem. The image appears way smaller and is squished. (BTW, the image dimensions are 500x375).

glGenTextures( 1, &S_GLator_InputFrameTextureIDSu );
        glBindTexture(GL_TEXTURE_2D, S_GLator_InputFrameTextureIDSu);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
        glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
        glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
        glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);

        glTexImage2D( GL_TEXTURE_2D, 0, 4, S_GLator_EffectCommonData.mRenderBufferWidthSu, S_GLator_EffectCommonData.mRenderBufferHeightSu, 0, GL_RGBA, GL_UNSIGNED_BYTE, dataP);
glBindTexture(GL_TEXTURE_2D, S_GLator_InputFrameTextureIDSu);
        glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, S_GLator_EffectCommonData.mRenderBufferWidthSu, S_GLator_EffectCommonData.mRenderBufferHeightSu, GL_RGBA, GL_UNSIGNED_BYTE, bufferP);
//set the matrix modes
        glMatrixMode( GL_PROJECTION );
        glLoadIdentity();
        //gluPerspective( 45.0, (GLdouble)widthL / heightL, 0.1, 100.0 );
        glOrtho (0, 1, 0, 1, -1, 1);
        // Set up the frame-buffer object just like a window.
        glViewport( 0, 0, widthL, heightL );
        glDisable(GL_DEPTH_TEST);
        glClearColor( 0.0f, 0.0f, 0.0f, 0.0f );
        glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );


        glMatrixMode( GL_MODELVIEW );
        glLoadIdentity();


        glBindTexture( GL_TEXTURE_2D, S_GLator_InputFrameTextureIDSu );


        //Render the geometry to the frame-buffer object


        glBegin(GL_QUADS); //input frame
            glColor4f(1.f,1.f,1.f,1.f);
            glTexCoord2f(0.0f,0.0f);    
            glVertex3f(0.f ,0.f ,0.0f);
            glTexCoord2f(1.0f,0.0f);    
            glVertex3f(1.f ,0.f,0.0f);
            glTexCoord2f(1.0f,1.f); 
            glVertex3f(1.f ,1.f,0.0f);
            glTexCoord2f(0.0f,1.f); 
            glVertex3f(0.f ,1.f,0.0f);
        glEnd();

Answer 1

I think I see you issue here. glViewport defines the viewport size, not the window size. So when you create your window (with glut, sdl, or wgl, or whatever), you have to specify the size. To get a 1:1 mapping of the glViewport to this window, those two need to match.

Answer 2

First, your image dimensions must be powers of two, not just arbitrary 500x375. Second, the internalformat (third) argument to glTexImage2D should be a symbolic constant, describing the internal format layout, not just "4" , as it's deprecated since OpenGL 1.2. Third, your dataP and bufferP storage layout must correspond to the current GL_UNPACK_ALIGNMENT . Fourth, your equilateral quad, on which you're trying to put the texture on, is essentially square, and thus your non-square texture will appear squashed or stretched with such a texture coordinates.