From 87b0bdb5e61472d33f4987d92d60c12cc21a6fe6 Mon Sep 17 00:00:00 2001
From: Kyle K <kylek389@gmail.com>
Date: Wed, 13 Oct 2010 21:07:28 -0500
Subject: pyramid: enabled fog

---
 sdl/GL_todo.txt |  2 ++
 sdl/glframe.c   |  4 ++--
 sdl/pyramid.c   | 27 ++++++++++++++++++++++++++-
 3 files changed, 30 insertions(+), 3 deletions(-)

diff --git a/sdl/GL_todo.txt b/sdl/GL_todo.txt
index 845aabd..4466642 100644
--- a/sdl/GL_todo.txt
+++ b/sdl/GL_todo.txt
@@ -9,3 +9,5 @@ todo:
 - enable fog
 - xbox controller
 - obj loader
+- look at mesa's sources and borrow OSD stuff
+- GL error checking and extensions
diff --git a/sdl/glframe.c b/sdl/glframe.c
index da7800e..668f8de 100644
--- a/sdl/glframe.c
+++ b/sdl/glframe.c
@@ -2,8 +2,8 @@
  *
  * Camera
  *
- * note: we could make these functions to be inlines, but they would need
- * to be moved into the header
+ * note: we could make these functions to be inlined, but they would need
+ * to be moved into a header
  *
  */
 
diff --git a/sdl/pyramid.c b/sdl/pyramid.c
index c7fe00e..fa78477 100644
--- a/sdl/pyramid.c
+++ b/sdl/pyramid.c
@@ -27,6 +27,11 @@ GLFrame camera;
 static GLfloat xRot = 0.0f;
 static GLfloat yRot = 0.0f;
 
+/* few arrays, they could make into the header at some point */
+GLfloat fNoLight[]     = { 0.0f, 0.0f, 0.0f, 0.0f };
+GLfloat fLowLight[]    = { 0.25f, 0.25f, 0.25f, 1.0f };
+GLfloat fBrightLight[] = { 1.0f, 1.0f, 1.0f, 1.0f };
+
 static void resize(int w, int h)
 {
     printf("window: resizing to %dx%d\n", w, h);
@@ -60,6 +65,13 @@ static void SetupRC()
     GLfloat whiteLight[] = { 0.05f, 0.05f, 0.05f, 1.0f };
     GLfloat sourceLight[] = { 0.75f, 0.75f, 0.75f, 1.0f };
     GLfloat    lightPos[] = { -10.f, 5.0f, 5.0f, 1.0f };
+    
+    /* setup fog */
+    glEnable(GL_FOG);
+    glFogfv(GL_FOG_COLOR, fLowLight);   /* set fog color to match background */
+    glFogf(GL_FOG_START, 4.0f);
+    glFogf(GL_FOG_END, 20.0f);
+    glFogi(GL_FOG_MODE, GL_LINEAR);     /* fog equation */ 
 
     glEnable(GL_DEPTH_TEST);    /* hidden surface removal */
     glFrontFace(GL_CCW);        /* counter clock-wise polygons face out */
@@ -106,6 +118,19 @@ static void SetupRC()
     
     /* set the camera to <0,0,0> */
     reset_glframe(&camera);
+    
+    /* multisampling for polygons */
+    //glEnable(GL_MULTISAMPLE);
+    
+    /* turn on anti aliasing for points, lines, and polygons */
+    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+    glEnable(GL_BLEND);
+    glEnable(GL_POINT_SMOOTH);
+    glHint(GL_POINT_SMOOTH_HINT, GL_NICEST);
+    glEnable(GL_LINE_SMOOTH);
+    glHint(GL_LINE_SMOOTH_HINT, GL_NICEST);
+    glEnable(GL_POLYGON_SMOOTH);
+    glHint(GL_POLYGON_SMOOTH_HINT, GL_NICEST);
 }
 
 static void keys(SDL_keysym *keysym, unsigned int *keys_held, int flag)
@@ -198,7 +223,7 @@ void processEvents()
 
 static void draw_ground(void)
 {
-    GLfloat fExtent = 10.0f;
+    GLfloat fExtent = 20.0f;
     GLfloat fStep = 0.5f;
     GLfloat y = -0.4f;
     GLfloat iLine;
-- 
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