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glBindTexture(GL_TEXTURE_2D, 0);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
//这里画纹理
glDrawBuffer(GL_COLOR_ATTACHMENT0);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glUseProgram(shader);
glBindVertexArray(vao);
glDrawArrays(GL_TRIANGLES, 0, 3);
glBindVertexArray(0);
glUseProgram(0);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
glBindTexture(GL_TEXTURE_2D, Tex);
//这里画正方体,并贴上纹理
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