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glm::vec4 to VBO

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Im trying to use a vec4 type for my vertex data, currently nothing shows on screen so i assume my copy method is erroneous...

can anyone please verify this?

#define VERTEX_SIZE sizeof(GLfloat) * 4 * 4
glBufferData(GL_ARRAY_BUFFER, VERTEX_SIZE, glm::value_ptr(vertex_data[0]), GL_DYNAMIC_DRAW);

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