Using 2 simple shaders, compile and links correctly.
VertexShader
#version 330 core
layout(location = 0) in vec3 inPosition;
layout(location = 1) in vec3 inColor;
out vec4 outColor;
void main()
{
gl_Position = vec4(inPosition.xyz, 1.0);
outColor = vec4(inColor, 1.0);
}
FragmentShader
#version 330
out vec4 outFragColor;
in vec4 inColor;
void main()
{
outFragColor = inColor;
}
ArrayBuffer class header
#ifndef _ARRAYBUFFEROBJECT_H_
#define _ARRAYBUFFEROBJECT_H_
#include <GL/glew.h>
// representing a openGL buffer object
class ArrayBufferObject
{
public:
ArrayBufferObject(): mID(0){}
~ArrayBufferObject() {}
// create the buffer
void Create(float T[], GLenum usage)
{
// generate buffer
glGenBuffers(1, &mID);
glBindBuffer(GL_ARRAY_BUFFER, mID);
// fill with data
int byteSize = sizeof(float) * 18;
glBufferData(GL_ARRAY_BUFFER, byteSize, T, usage);
// unbind
glBindBuffer(GL_ARRAY_BUFFER, 0);
}
// dispose of the buffer
void Dispose()
{
// unbind buffer and delete
glBindBuffer(GL_ARRAY_BUFFER, 0);
glDeleteBuffers(1, &mID);
}
void Bind() { glBindBuffer(GL_ARRAY_BUFFER, mID); }
void Unbind() { glBindBuffer(GL_ARRAY_BUFFER, 0); }
unsigned int GetID() { return mID; }
private:
GLuint mID;
};
#endifDraw code
// clear buffers
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
// use program
defaultShader.Bind();
glEnableVertexAttribArray(0);
glEnableVertexAttribArray(1);
PVB.Bind();
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, 0);
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 0, (GLvoid*)36);
glDrawArrays(GL_TRIANGLES, 0, 3);
glDisableVertexAttribArray(0);
glDisableVertexAttribArray(1);
PVB.Unbind();
defaultShader.Unbind();
// swap the buffers
SwapBuffers(mWndDC);
