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I'm trying to pass in attributes to my vertex shader but for some reason it keeps giving me a -1 on the 3rd attribute location I'm asking openGl to retrieve via glGetAttribLocation(). Currently it keeps giving me a -1 for the texCoord attribute and if I switch the texAttrib and colAttrib around (switching the lines in code) it gives me a -1 on the color property instead of the texture and I have no idea why? Since a -1 is being passed to glVertexAttribPointer I get the 1281 OpenGL error: GL_INVALID_VALUE. My vertex shader: #version 150 in vec3 position; in vec3 color; in vec2 texcoord; out vec3 Color; out vec2 Texcoord; void main() { Color = color; Texcoord = texcoord; gl_Position = vec4(position.x, position.y, position.z, 1.0); } OpenGL code: basicShader.Use(); // Buffers and shaders glGenVertexArrays(1, &vao); glBindVertexArray(vao); glGenBuffers(1, &vbo); // Make it active vbo glBindBuffer(GL_ARRAY_BUFFER, vbo); // Build basic triangle float vertices[] = { // position // color // textures -0.5f, 0.5f, 0.5f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, // Top-left 0.5f, 0.5f, 0.5f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f, // Top-right 0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, // Bottom-right -0.5f, -0.5f, 0.5f, 1.0f, 1.0f, 1.0f, 0.0f, 1.0f// Bottom-left }; GLuint elements[] = { 0, 1, 2, 2, 3, 0 }; glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW); GLint posAttrib = glGetAttribLocation(basicShader.shaderProgram, "position"); glEnableVertexAttribArray(posAttrib); // Enable attribute first before specifiying attributes glVertexAttribPointer(posAttrib, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), 0); // 6 float sizes is every new vertex GLint colAttrib = glGetAttribLocation(basicShader.shaderProgram, "color"); glEnableVertexAttribArray(colAttrib); glVertexAttribPointer(colAttrib, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)(

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