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POattach two images to fbo for mrt rendering
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20827976
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0
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2
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2013-12-29T17:23:08.533
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2013-12-29T18:54:11.140
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2013-12-29T17:52:48.823
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2798943
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text
Body
I want to attach two render targets to a fbo, so I can render to two targets at once. I have one function that accepts two render targets. <pre><code>void render(struct glhexbutton *_this, GLuint target0, GLuint target1) { GLenum buffers[2]; GLfloat vertices[] = { -1.0, -1.0, -1.0, 1.0, 1.0, -1.0, 1.0, 1.0 }; GLubyte indices[] = { 0, 1, 2, 1, 2, 3 }; GLuint fbo; struct { int x; int y; } position; /*Load variables into shader program*/ glUniform4f(glhexbutton_static.uni_address, 1.0, 1.0, 1.0, 1.0); glActiveTexture(GL_TEXTURE0); glBindTexture(GL_TEXTURE_2D, _this->data.texture); glUniform1i(glhexbutton_static.uni_texture, /*GL_TEXTURE*/0); glBindTexture(GL_TEXTURE_2D, 0); glUseProgram(_this->data.static_data->program); /*create fbo and attach render targets*/ glGenFramebuffers(1, &fbo); glBindFramebuffer(GL_FRAMEBUFFER, fbo); glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, target0, 0); glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT1, GL_TEXTURE_2D, target1, 0); /*Set the viewport of the fbo*/ position.x = glutGet(GLUT_WINDOW_WIDTH)*_this->data.position.relative.x+_this->data.position.offset.x; position.y = glutGet(GLUT_WINDOW_HEIGHT)*_this->data.position.relative.y+_this->data.position.offset.y; glViewport(position.x, position.y, _this->data.size.width, _this->data.size.height); buffers[0] = GL_COLOR_ATTACHMENT0; buffers[1] = GL_COLOR_ATTACHMENT1; glDrawBuffers(2, buffers); glEnableVertexAttribArray(_this->data.static_data->att_coord); glVertexAttribPointer(_this->data.static_data->att_coord, 2, GL_FLOAT, GL_FALSE, 0, vertices); glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_BYTE, indices); glDisableVertexAttribArray(_this->data.static_data->att_coord); glBindFramebuffer(GL_FRAMEBUFFER, 0); glDeleteFramebuffers(GL_FRAMEBUFFER, &fbo); } </code></pre> my vertex shader: <pre><code>#version 330 attribute vec2 coord; varying vec2 f_coord; void main() { gl_Position = vec4(coord, 0.0, 1.0); f_coord = (1.0+coord)/2.0; } </code></pre> my pixel/fragment shader: <pre><code>#version 330 uniform sampler2D texture; uniform vec4 address; varying vec2 f_coord; void main() { gl_FragData[0]=texture2D(texture,f_coord); gl_FragData[1]=address; if(texture2D(texture,f_coord).a == 0.0) discard; } </code></pre> When I call <pre><code>render(glhexbutton, 0, texture); </code></pre> or <pre><code>render(glhexbutton, texture, 0); </code></pre> I just get a black blank screen
Tags
<c++><c><opengl><framebuffer><fbo>
Title
attach two images to fbo for mrt rendering
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1. USuser2798943
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