From 677946679209cca008294da5ed64ccecf6be8966 Mon Sep 17 00:00:00 2001
From: Josh Holtrop <jholtrop@gmail.com>
Date: Mon, 28 Oct 2013 23:13:31 -0400
Subject: [PATCH] make quad spin

---
 source/app.d | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/source/app.d b/source/app.d
index 360d423..9da9003 100644
--- a/source/app.d
+++ b/source/app.d
@@ -4,12 +4,15 @@ import derelict.opengl3.gl3;
 import glamour.vao;
 import glamour.shader;
 import glamour.vbo;
+import gl3n.linalg;
 
 enum int WIDTH = 800;
 enum int HEIGHT = 600;
 
 GLint position_idx;
 GLint color_idx;
+GLint view_idx;
+mat4 view_matrix;
 
 void init()
 {
@@ -17,12 +20,13 @@ void init()
     glViewport(0, 0, WIDTH, HEIGHT);
     immutable string shader_src = `
 vertex:
+    uniform mat4 view;
     in vec2 position;
     in vec3 color;
     out vec3 color_i;
     void main(void)
     {
-        gl_Position = vec4(position, 0.0, 1.0);
+        gl_Position = view * vec4(position, 0.0, 1.0);
         color_i = color;
     }
 fragment:
@@ -50,12 +54,16 @@ fragment:
     glVertexAttribPointer(color_idx, 3, GL_FLOAT, GL_FALSE, 0, null);
     ElementBuffer ibo = new ElementBuffer(indices);
     ibo.bind();
+    view_idx = program.get_uniform_location("view");
 }
 
 void display(SDL_Window * window)
 {
     glClear(GL_COLOR_BUFFER_BIT);
 
+    view_matrix.make_identity();
+    view_matrix.rotate(SDL_GetTicks() / 500.0, vec3(0.0, 0.0, 1.0));
+    glUniformMatrix4fv(view_idx, 1, GL_TRUE, view_matrix.value_ptr);
     glDrawElements(GL_TRIANGLE_FAN, 4, GL_UNSIGNED_SHORT, null);
 
     SDL_GL_SwapWindow(window);