OpenGL中如何将某个texture拷贝到另外一个texture

参考stackoverflow，可行的方法为 一、使用glCopyImageSubData，这个方法最直观而且简单。不过需要 OpenGL 4.3 二、为目标texture创建FBO。使用shader，采用texture2D把源texture画到目标texture 三、为源texture创建FBO。使用glCopyTexSubImage2D从framebuffer拷贝到目标纹理

1. fboId = srcTex->GetFrameBufferId();

2. glBindFramebuffer(GL_FRAMEBUFFER, fboId);

4. outTexId = dstTex->GetTextureId();

5. glActiveTexture(GL_TEXTURE0);

6. glBindTexture(GL_TEXTURE_2D, outTexId);

8. glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0,

9. 0, 0, srcTex->GetWidth(), srcTex->GetHeight());

11. glBindTexture(GL_TEXTURE_2D, 0);

12. glBindFramebuffer(GL_FRAMEBUFFER, 0);

四、glBlitFramebuffer。这个需要OpenGL ES 3.0以上支持

1. glBindFramebuffer(GL_FRAMEBUFFER, fbo);

2. glFramebufferTexture2D(GL_READ_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,

3. GL_TEXTURE_2D, tex1, 0);

4. glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT1,

5. GL_TEXTURE_2D, tex2, 0);

6. glDrawBuffer(GL_COLOR_ATTACHMENT1);

7. glBlitFramebuffer(0, 0, width, height, 0, 0, width, height,

8. GL_COLOR_BUFFER_BIT, GL_NEAREST);

五、glCopyPixels

opengl - Best method to copy texture to texture - Stack Overflowopengl - How to copy texture1 to texture2 efficiently? - Stack Overflow