add makeBuffer() and triangle data

template/test.cc

@@ -12,7 +12,18 @@ using namespace std;
 #define WIDTH   800
 #define HEIGHT  600
 
-GLuint program, vs, fs;
+const GLfloat data[][2][3] = {
+    {{-1.0, -0.6, 0.0}, {1, 0, 0}},
+    {{-0.2, -0.6, 0.0}, {0, 1, 0}},
+    {{-0.6, 0.6, 0.0}, {0, 0, 1}},
+    {{0.2, -0.6, 0.0}, {1, 0, 0}},
+    {{1.0, -0.6, 0.0}, {0, 1, 0}},
+    {{0.6, 0.6, -500.0}, {0, 0, 1}}
+};
+const GLushort indices[] = {
+    0, 1, 2, 3, 4, 5
+};
+GLuint program, vs, fs, data_vbo, index_vbo;
 
 char * loadFile(const char *fname)
 {
@@ -98,6 +109,15 @@ out:
     return 0;
 }
 
+GLuint makeBuffer(GLenum target, const void *ptr, size_t sz)
+{
+    GLuint id;
+    glGenBuffers(1, &id);
+    glBindBuffer(target, id);
+    glBufferData(target, sz, ptr, GL_STATIC_DRAW);
+    return id;
+}
+
 bool init(int width, int height)
 {
     glClearColor (0.0, 0.0, 0.0, 0.0);
@@ -106,7 +126,7 @@ bool init(int width, int height)
     glMatrixMode(GL_PROJECTION);
     glLoadIdentity();
     glOrtho((float)-width/(float)height, (float)width/(float)height,
-            -1, 1, -1, 1);
+            -1, 1, -1000, 1);
     glMatrixMode(GL_MODELVIEW);
     glLoadIdentity();
 
@@ -135,6 +155,9 @@ bool init(int width, int height)
         return false;
     }
 
+    data_vbo = makeBuffer(GL_ARRAY_BUFFER, data, sizeof(data));
+    index_vbo = makeBuffer(GL_ELEMENT_ARRAY_BUFFER, indices, sizeof(indices));
+
     return true;
 }