seperate color buffer

src/main.c

@@ -168,6 +168,44 @@ void init(void) {
 		0.35f, -0.7f
 	};
 
+	GLfloat colors[] = {
+		// R  // G  // B
+		1.0f, 0.0f, 0.0f,
+		1.0f, 0.0f, 0.3f,
+		1.0f, 0.3f, 0.0f,
+
+		1.0f, 0.3f, 0.3f,
+		1.0f, 0.3f, 0.6f,
+		1.0f, 0.6f, 0.3f,
+
+
+		0.0f, 1.0f, 0.0f,
+		0.0f, 1.0f, 0.3f,
+		0.3f, 1.0f, 0.0f,
+
+		0.3f, 1.0f, 0.3f,
+		0.3f, 1.0f, 0.6f,
+		0.6f, 1.0f, 0.3f,
+
+
+		0.3f, 0.3f, 1.0f,
+		0.3f, 0.6f, 1.0f,
+		0.6f, 0.3f, 1.0f,
+
+		0.3f, 0.3f, 1.0f,
+		0.3f, 0.6f, 1.0f,
+		0.6f, 0.3f, 1.0f,
+
+
+		1.0f, 1.0f, 0.0f,
+		1.0f, 1.0f, 0.1f,
+		1.0f, 1.0f, 0.2f,
+
+		1.0f, 1.0f, 0.7f,
+		1.0f, 1.0f, 0.8f,
+		1.0f, 1.0f, 0.9f
+	};
+
 	DEBUG("Creating vertext buffer");
 	GLuint vertexBuffer;
 	glGenBuffers(1, &vertexBuffer);
@@ -175,6 +213,13 @@ void init(void) {
 	glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
 	glBindBuffer(GL_ARRAY_BUFFER, 0);
 
+	DEBUG("Creating colour buffer");
+	GLuint colorBuffer;
+	glGenBuffers(1, &colorBuffer);
+	glBindBuffer(GL_ARRAY_BUFFER, colorBuffer);
+	glBufferData(GL_ARRAY_BUFFER, sizeof(colors), colors, GL_STATIC_DRAW);
+	glBindBuffer(GL_ARRAY_BUFFER, 0);
+
 	DEBUG("Creating vertex array object");
 	// create vertex array object
 	glGenVertexArrays(1, &vertexArrayObject);
@@ -192,6 +237,12 @@ void init(void) {
 	);
 	glEnableVertexAttribArray(0);
 
+	// vertex color data
+	glBindBuffer(GL_ARRAY_BUFFER, colorBuffer);
+	glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(GLfloat), 0);
+	glEnableVertexAttribArray(1);
+
+
 	glBindBuffer(GL_ARRAY_BUFFER, 0);
 	glBindVertexArray(0);
 
@@ -214,10 +265,6 @@ void draw(void) {
 	glClear(GL_COLOR_BUFFER_BIT);
 	glUseProgram(program);
 
-	GLuint colorLocation = glGetUniformLocation(program, "uColor");
-	ColorRGB color = hslToRgb(currentHue, 1.0f, 0.5f);
-	glUniform3f(colorLocation, color.r, color.g, color.b);
-
 	GLuint positionLocation = glGetUniformLocation(program, "uPosition");
 	glUniform2f(positionLocation, cos(currentHue * 2 * M_PI) * 0.2f, sin(currentHue * 2 * M_PI) * 0.2f);
 

src/shaders/vertex.glsl

@@ -1,11 +1,11 @@
 #version 330 core
 layout (location = 0) in vec2 aPosition;
-uniform vec3 uColor;
+layout (location = 1) in vec3 aColor;
 uniform vec2 uPosition;
 
 out vec3 vertexColor;
 
 void main() {
-	vertexColor = uColor;
+	vertexColor = aColor;
 	gl_Position = vec4(uPosition + aPosition, 0.0, 1.0);
 }