Draw spheres in correct size

…using billboarding.

1 files changed, 14 insertions, 1 deletions

diff --git a/boltzgas/visual/shader.py b/boltzgas/visual/shader.py
index b4295a8..c6c035b 100644
--- a/boltzgas/visual/shader.py
+++ b/boltzgas/visual/shader.py
@@ -1,4 +1,4 @@
-from OpenGL.GL import GL_VERTEX_SHADER, GL_FRAGMENT_SHADER
+from OpenGL.GL import GL_VERTEX_SHADER, GL_FRAGMENT_SHADER, GL_GEOMETRY_SHADER
 from OpenGL.GL import shaders
 
 class Shader:
@@ -13,3 +13,16 @@ class Shader:
     def use(self):
         shaders.glUseProgram(self.program)
 
+class GeometryShader:
+    def __init__(self, fragment_src, geometry_src, vertex_src, uniform):
+        self.program = shaders.compileProgram(
+            shaders.compileShader(vertex_src, GL_VERTEX_SHADER),
+            shaders.compileShader(geometry_src, GL_GEOMETRY_SHADER),
+            shaders.compileShader(fragment_src, GL_FRAGMENT_SHADER))
+        self.uniform = { }
+        for name in uniform:
+            self.uniform[name] = shaders.glGetUniformLocation(self.program, name)
+
+    def use(self):
+        shaders.glUseProgram(self.program)
+