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POGLSL : Vertices are missing
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copied!<p>When I use immediate mode, it draws correctly but when i pass the same vertices to the GPU, or even point them, it doesn't work.</p> <p>there is a position buffer holding vertices :</p> <pre><code>std::vector<glm::vec3> posbuf; </code></pre> <p>and indices for it.</p> <p>immediate mode :</p> <pre><code>for (unsigned int i =0; i < indices.size(); i++) { glBegin(GL_TRIANGLES); glVertex3f(posbuf[indices[i].index[0]].x, posbuf[indices[i].index[0]].y, posbuf[indices[i].index[0]].z); glVertex3f(posbuf[indices[i].index[1]].x, posbuf[indices[i].index[1]].y, posbuf[indices[i].index[1]].z); glVertex3f(posbuf[indices[i].index[2]].x, posbuf[indices[i].index[2]].y, posbuf[indices[i].index[2]].z); glEnd(); } </code></pre> <p>and this is the vertex attribute code :</p> <pre><code>glEnableVertexAttribArray(GL_ATTRIB_POS); glVertexAttribPointer(GL_ATTRIB_POS, 3, GL_FLOAT, GL_FALSE, 0,&posbuf[0]); glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indVBO); glDrawElements(GL_TRIANGLES, indices.size(), GL_UNSIGNED_INT, 0); glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0); glDisableVertexAttribArray(GL_ATTRIB_POS); </code></pre> <p>and a shader for it :</p> <pre><code>#version 120 attribute vec3 position; void main() { vec4 finalv=vec4(position, 1.0); gl_Position = gl_ModelViewProjectionMatrix * vec4(finalv.xyz,1.0); } [frag] #version 120 void main() { gl_FragColor = vec4(1.0,0.0,0.0,1.0); } </code></pre> <p>immediate result : <img src="https://i.stack.imgur.com/HoTbX.png" alt="enter image description here"></p> <p>shader result: <img src="https://i.stack.imgur.com/BPUdc.png" alt="enter image description here"></p> <p>I don't know what's wrong, i also tried to pass posbuf using glm::value_ptr, they all give the same result. I am on fedora 18, supporting glsl up to #version 140, opengl 3.3. </p> <p>EDIT :</p> <pre><code>glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indVBO); glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(Triangle) * indices.size(), &indices[0], GL_STATIC_DRAW); glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0); struct Triangle { int index[3]; }; </code></pre>

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