setting up shader experiments

shader_experiments/shader_loader.py

@@ -0,0 +1,51 @@
+BaseContext = testingcontext.getInteractive()
+from OpenGL.GL import *
+from OpenGL.arrays import vbo
+from OpenGL.GL import shaders
+
+class TextContext( BaseContext ):
+    """ Creates a simple vertex shader ... """
+
+def Oninit(self):
+    VERTEX_SHADER = shaders.compileShader("""#version 120 
+void main() {
+     gl_position = gl_ModeViewProjectionMatrix * gl_Vertex;
+ }""", GL_VERTEX_SHADER)
+
+    FRAGMENT_SHADER = shaders.compileShader("""#version 120
+void main() {
+    gl_FragColor = vect4(0, 1, 0, 1 );
+}""", GL_FRAMENT_SHADER)
+
+self.shader = shaders.compileProgram(VERTEX_SHADER,FRAGMENT_SHADER)
+
+self.vbo = vbo.VBO(
+    array( [
+        [ 0, 1, 0 ],
+        [ -1, -1, 0 ],
+        [ 1, -1, 0 ],
+        [ 2, -1, 0 ],
+        [ 4, -1, 0 ],
+        [ 4, 1, 0 ],
+        [ 2, -1, 0 ],
+        [ 4, 1, 0 ],
+        [ 2, 1, 0 ],
+    ], 'f')
+)
+
+def Render(self, mode):
+    """"Renders the geometry for the scene"""
+    shaders.glUseProgram(self.shader)
+    try:
+        self.vbo.bind()
+        try:
+            glEnableClientState(GL_VERTEX_ARRAY)
+            glVertexPointerf(self.vbo)
+            glDrawArrays(GL_TRIANGLES,0,9)
+        finally:
+            self.vbo.unbind()
+            glDisableClientState(GL_VERTEX_ARRAY)
+    finally:
+        shaders.glUseProgram(0)
+
+