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POOpenGL 3.0: Access Violation exception caused by VBOs
 

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  1. POOpenGL 3.0: Access Violation exception caused by VBOs
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    <p>I am updating a quite outdated OpenGL project. So I am trying to move from vertex arrays to VBOs, but I have an access violation exception that I cannot trace.</p> <p>So I am using a VBO and an IBO that I generate in my class constructor:</p> <pre><code>if (glewIsSupported("GL_VERSION_3_0")) { glGenBuffers(2, bufferIds); } </code></pre> <p>(glewInit() was already called)</p> <p>The various rendering objects are defined as:</p> <pre><code>struct RenderBufferVertexElement { NxVec3 position; NxVec3 normal; float texCoord[2]; }; // The rendering buffers RenderBufferVertexElement* mVertexRenderBuffer; NxU32* mIndexRenderBuffer; // Buffer Objects enum { VBO, IBO }; GLuint bufferIds[2]; </code></pre> <p>Then in my drawing function I do:</p> <pre><code>glEnableClientState(GL_VERTEX_ARRAY); glEnableClientState(GL_NORMAL_ARRAY); // VBO glBindBuffer(GL_ARRAY_BUFFER, bufferIds[VBO]); glBufferData(GL_ARRAY_BUFFER, sizeof(mVertexRenderBuffer), mVertexRenderBuffer, GL_STREAM_DRAW); glVertexPointer(3, GL_FLOAT, sizeof(RenderBufferVertexElement), BUFFER_OFFSET(offsetof(RenderBufferVertexElement,position))); glNormalPointer(GL_FLOAT, sizeof(RenderBufferVertexElement), BUFFER_OFFSET( offsetof(RenderBufferVertexElement,normal) )); // IBO glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, bufferIds[IBO]); glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(mIndexRenderBuffer), mIndexRenderBuffer, GL_STREAM_DRAW); textures.front()-&gt;setClientActive(); glEnableClientState(GL_TEXTURE_COORD_ARRAY); glTexCoordPointer(2, GL_FLOAT, sizeof(RenderBufferVertexElement), BUFFER_OFFSET(offsetof(RenderBufferVertexElement,texCoord))); glEnable(GL_TEXTURE_2D); glBindTexture(GL_TEXTURE_2D, textures.front()-&gt;textureId); [...] glDrawElements(GL_TRIANGLES, numElements, GL_UNSIGNED_INT, BUFFER_OFFSET(0)); glDisableClientState(...); glDisable(GL_TEXTURE_2D); </code></pre> <p>Everything worked fine with old style calls to glVertexPointer... but now my program crashes with an access violation exception. Any idea where that might come from?</p> <p>Thanks</p>
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    1. COI also tried to call glBufferData() only during initialization but with no success.
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