Add color array

exercise1/glsl/shader.frag

@@ -7,11 +7,9 @@ in vec4 fragment_color;
 
 out vec4 color;
 
-
-
 void main()
 {
-	color = fragment_color * 0.5 + vec4(0.5);
+	color = fragment_color;
 
 	 /**** Begin of tasks ***
 	 - 1.2.5

exercise1/glsl/shader.vert

@@ -4,16 +4,15 @@
 #version 130
 
 in vec4 in_position;
+in vec4 in_color;
 
 out vec4 fragment_color;
 
-
-
-
 void main()
 {
 	gl_Position = in_position;
-	fragment_color = in_position;
+	
+	fragment_color = in_color;
 
 	/* - 1.2.2 (b)
 	 * Declare a new "in" variable with the name "in_color". Instead of setting

exercise1/src/Viewer.cpp

@@ -60,6 +60,23 @@ void Viewer::CreateVertexBuffers()
 		-1, -1, 0, 1,
 		1, -1, 0, 1};
 
+	GLfloat colors[] = {
+		1,
+		0,
+		0,
+		1,
+
+		0,
+		1,
+		0,
+		1,
+
+		0,
+		0,
+		1,
+		1,
+	};
+
 	// Generate the vertex array
 	glGenVertexArrays(1, &vertex_array_id);
 	glBindVertexArray(vertex_array_id);
@@ -88,6 +105,14 @@ void Viewer::CreateVertexBuffers()
 
 	/*** End of task 1.2.2 (a) ***/
 
+	glGenBuffers(1, &color_buffer_id);
+	glBindBuffer(GL_ARRAY_BUFFER, color_buffer_id);
+	glBufferData(GL_ARRAY_BUFFER, sizeof(colors), colors, GL_STATIC_DRAW);
+
+	GLuint cid = glGetAttribLocation(program_id, "in_color");
+	glEnableVertexAttribArray(cid);
+	glVertexAttribPointer(cid, 4, GL_FLOAT, GL_FALSE, 0, 0);
+
 	// Unbind the vertex array to leave OpenGL in a clean state
 	glBindVertexArray(0);
 }