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POOpenGL can't send attribute data to shader
 

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  1. POOpenGL can't send attribute data to shader
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    <p>I'm able to render a VBO with vertices but when I try adding in colours (using shader attributes) nothing shows up. What am I doing wrong here? I can find a lot of online examples showing this working for interleaved VBO's, but I'd rather use this method (serialized array) instead. Any ideas? </p> <p>Buffer Generation &amp; Allocation</p> <pre><code>glGenVertexArrays( 1, &amp;vao ); glBindVertexArray( vao ); glGenBuffers( 1, &amp;vbo ); glBindBuffer( GL_ARRAY_BUFFER, vbo ); glBufferData( GL_ARRAY_BUFFER, ( vertices.size() + colors.size() ) * sizeof(float), NULL, GL_STATIC_DRAW ); glBufferSubData( GL_ARRAY_BUFFER, 0, vertices.size() * sizeof(vertices[0]), vertices.data() ); glBufferSubData( GL_ARRAY_BUFFER, vertices.size() * sizeof(vertices[0]), colors.size() * sizeof(colors[0]), colors.data() ); /* HERE if I replace the lower block with this top portion, things show up fine glEnableClientState( GL_VERTEX_ARRAY ); glVertexPointer( 3, GL_FLOAT, 0, (void*)0); */ glEnableVertexAttribArray( 0 ); glEnableVertexAttribArray( 1 ); glVertexAttribPointer( 0, 3, GL_FLOAT, GL_FALSE, 0, 0 ); glVertexAttribPointer( 1, 3, GL_FLOAT, GL_FALSE, 0, (void*)(vertices.size() * sizeof(GLfloat)) ); glGenBuffers( 1, &amp;ibo ); glBindBuffer( GL_ELEMENT_ARRAY_BUFFER, ibo ); glBufferData( GL_ELEMENT_ARRAY_BUFFER, faces.size() * sizeof(GLushort), faces.data(), GL_STATIC_DRAW ); </code></pre> <p>Drawing here</p> <pre><code>glClearColor( 0.0f, 0.0f, 0.0f, 0.0f ); glClearDepth( 1.0f ); glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ); glUseProgram( gl ); glBindVertexArray( vao ); glBindBuffer( GL_ELEMENT_ARRAY_BUFFER, ibo ); glDrawElements( GL_TRIANGLE_FAN, faces.size(), GL_UNSIGNED_SHORT, (void*)0 ); glutSwapBuffers(); glutPostRedisplay(); </code></pre> <p>vert shader</p> <pre><code>#version 130 layout (location = 0 ) in vec3 in_Position; layout (location = 1 ) in vec3 in_Color; out vec3 out_Color; void main() { out_Color = in_Color; gl_Position = vec4(in_Position,1.0); } </code></pre> <p>frag shader</p> <pre><code>#version 130 in vec3 out_Color; void main() { gl_FragColor = vec4(out_Color, 1.0); } </code></pre>
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    1. USglitchyme
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    1. COBy the way (whouldn't be your problem, though), the buffer bound to `GL_ELEMENT_ARRAY_BUFFER` is part of a VAO's state, so you can actuall move the `glBindBuffer( GL_ELEMENT_ARRAY_BUFFER, ibo );` from the draw code into the VAO setup code (well, you're already doing that, just don't unbind the IBO before unbinding the VAO there).
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      1. USChristian Rau
 

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