OpenGL ES 2.0渲染到纹理 [英] OpenGL ES 2.0 render to texture

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本文介绍了OpenGL ES 2.0渲染到纹理的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我正在尝试使用OpenGL ES 2.0渲染到纹理,但我似乎无法使其工作。

I'm trying to render to a texture using OpenGL ES 2.0, but I can't seem to make it work.

这就是我的处理方式:

    struct RenderTexture
    {
        GLuint framebuffer;
        GLuint tex;
        GLint old_fbo;


        RenderTexture(GLuint width, GLuint height)
        {
            glGetIntegerv(GL_FRAMEBUFFER_BINDING, &old_fbo);

            glGenFramebuffers(1, &framebuffer);
            glGenTextures(1, &tex);

            glBindFramebuffer(GL_FRAMEBUFFER, framebuffer);
            glBindTexture(GL_TEXTURE_2D, tex);
            glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 
                         width, height, 0, GL_RGBA, 
                         GL_UNSIGNED_BYTE, NULL);
            glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, 
                                   tex, 0);

            glClearColor(1, 0, 0, 1);
            glClear(GL_COLOR_BUFFER_BIT);

            GLuint status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
            if (status != GL_FRAMEBUFFER_COMPLETE) {
                cout << status << endl; // this is not called
            }

            glBindFramebuffer(GL_FRAMEBUFFER, old_fbo);
        }

        void begin()
        {
            glGetIntegerv(GL_FRAMEBUFFER_BINDING, &old_fbo);
            glBindFramebuffer(GL_FRAMEBUFFER, framebuffer);
        }

        void end()
        {
            glBindFramebuffer(GL_FRAMEBUFFER, old_fbo);
        }
    };

但是当我尝试使用它并使用生成的纹理时,纹理被绘制为完全黑色。

But when I try drawing on it and using the resulting texture, the texture is drawn as totally black.

如果我不将图纸代码包装在 render_tex-> begin(); render_tex-> end(); ,一切都正确绘制,让我相信问题与上面的代码隔离。

If I just don't wrap the drawing code in render_tex->begin(); and render_tex->end();, everything draws correctly, leading me to believe that the problem is isolated to the code above.

推荐答案

这已经有一段时间了,但正如我在评论中写的那样,请确保你正在初始化2纹理的力量。

This has been a while, but as I wrote in the comments, be sure you're initializing a power of 2 texture.

这篇关于OpenGL ES 2.0渲染到纹理的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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