I am trying to draw shapes onto my application. I have added #include <glad/glad.h>
into my code.
I set my vertex array, vertex buffer & index buffer as unsigned ints in my header file.
In my application.h file I added this:
unsigned int m_FCvertexArray; // Textured Phong VAO
unsigned int m_FCvertexBuffer;// Textured Phong VBO
unsigned int m_FCindexBuffer; // Index buffer for texture Phong cube
In my application.cpp in my constructor I added this:
Application::Application()
{
//------------- OPENGL VALUES -----------//
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LESS);
// Enabling backface culling to ensure triangle vertices are correct ordered (CCW)
glEnable(GL_CULL_FACE);
glCullFace(GL_BACK);
////--------DRAW VERTICES---------//
float FCvertices[3 * 3] = {
-0.5f, -0.5f, 0.0f,
0.5f, -0.5f, 0.0f,
0.0f, 0.5f, 0.0f
};
glGenVertexArrays(1, &m_FCvertexArray);
glBindVertexArray(m_FCvertexArray);
glCreateBuffers(1, &m_FCvertexBuffer);
glBindBuffer(GL_ARRAY_BUFFER, m_FCvertexBuffer);
//
//
glBufferData(GL_ARRAY_BUFFER, sizeof(FCvertices), FCvertices, GL_STATIC_DRAW);
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(float), (void*)0);
glEnableVertexAttribArray(1);
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(float), (void*)(sizeof(float) * 3));
////--------DRAW INDICES---------//
glCreateBuffers(1, &m_FCindexBuffer);
glBindBuffer(GL_ARRAY_BUFFER, m_FCindexBuffer);
unsigned int indices[3] = {0, 1, 2};
glBufferData(GL_ARRAY_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW);
}
in my void Application::run()
I added:
glUseProgram(m_FCprogram);
glBindVertexArray(m_FCvertexArray);
glDrawElements(GL_TRIANGLES, 3, GL_UNSIGNED_INT, nullptr);
now the problem is when I run the code, it gives me the error mentioned on the title:
I've been trying ways to fix this but it seems not to work. and if i comment out glDrawElements, the code runs and works but no shapes are drawn (obvious).
When you create the index buffer, you need to use GL_ELEMENT_ARRAY_BUFFER instead of GL_ARRAY_BUFFER.
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