From ec149216ff307b9b03e0f5eb7c05c749acc0dbf8 Mon Sep 17 00:00:00 2001
From: Josh Holtrop <jholtrop@gmail.com>
Date: Mon, 28 Oct 2013 22:49:20 -0400
Subject: [PATCH] use glamour for VAO, VBO, and Shader interfaces

---
 source/app.d | 44 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)

diff --git a/source/app.d b/source/app.d
index 8d6e6de..360d423 100644
--- a/source/app.d
+++ b/source/app.d
@@ -1,19 +1,63 @@
 import std.stdio;
 import derelict.sdl2.sdl;
 import derelict.opengl3.gl3;
+import glamour.vao;
+import glamour.shader;
+import glamour.vbo;
 
 enum int WIDTH = 800;
 enum int HEIGHT = 600;
 
+GLint position_idx;
+GLint color_idx;
+
 void init()
 {
     glClearColor (1.0, 0.7, 0.0, 0.0);
     glViewport(0, 0, WIDTH, HEIGHT);
+    immutable string shader_src = `
+vertex:
+    in vec2 position;
+    in vec3 color;
+    out vec3 color_i;
+    void main(void)
+    {
+        gl_Position = vec4(position, 0.0, 1.0);
+        color_i = color;
+    }
+fragment:
+    in vec3 color_i;
+    void main(void)
+    {
+        gl_FragColor = vec4(color_i, 1.0);
+    }
+        `;
+    VAO vao = new VAO();
+    Shader program = new Shader("program", shader_src);
+    program.bind();
+    position_idx = program.get_attrib_location("position");
+    color_idx = program.get_attrib_location("color");
+    float[] vertices = [0.4, 0.4, -0.4, 0.4, -0.4, -0.4, 0.4, -0.4];
+    float[] colors = [1.0, 0.0, 0.0,  0.0, 1.0, 0.0,  0.0, 0.0, 1.0,  1.0, 1.0, 1.0];
+    ushort[] indices = [0, 1, 2, 3];
+    Buffer vbo = new Buffer(vertices);
+    vbo.bind();
+    glEnableVertexAttribArray(position_idx);
+    glVertexAttribPointer(position_idx, 2, GL_FLOAT, GL_FALSE, 0, null);
+    Buffer cbo = new Buffer(colors);
+    cbo.bind();
+    glEnableVertexAttribArray(color_idx);
+    glVertexAttribPointer(color_idx, 3, GL_FLOAT, GL_FALSE, 0, null);
+    ElementBuffer ibo = new ElementBuffer(indices);
+    ibo.bind();
 }
 
 void display(SDL_Window * window)
 {
     glClear(GL_COLOR_BUFFER_BIT);
+
+    glDrawElements(GL_TRIANGLE_FAN, 4, GL_UNSIGNED_SHORT, null);
+
     SDL_GL_SwapWindow(window);
 }