pyramid: switch from immiediate redering to display list

2 files changed, 26 insertions, 4 deletions

diff --git a/sdl/GL_notes.txt b/sdl/GL_notes.txt
index c4d71fe..a370290 100644
--- a/sdl/GL_notes.txt
+++ b/sdl/GL_notes.txt
@@ -41,4 +41,8 @@ Terms
 OBJ Loader
 - glGenTextures()
 - glBindTextures() 
-  
+
+Pipeline
+- Display Lists: precompile series of OpenGL commands (static)
+- Vertex Array: modifiable, gets rid of glBegin() and glEnd() ?
+
diff --git a/sdl/pyramid.c b/sdl/pyramid.c
index 689e9dd..783b2de 100644
--- a/sdl/pyramid.c
+++ b/sdl/pyramid.c
@@ -29,6 +29,10 @@
 int program_running = 1;
 GLFrame camera;
 
+/* display lists identifiers */
+GLuint ground_list;
+GLuint triangle_list;
+
 static GLfloat xRot = 0.0f;
 static GLfloat yRot = 0.0f;
 
@@ -148,6 +152,18 @@ static void setup_opengl(void)
     
     /* don't know about this, but why not */
     glLightModeli(GL_LIGHT_MODEL_COLOR_CONTROL, GL_SEPARATE_SPECULAR_COLOR);
+    
+    /* display list, precompile commands */
+    ground_list = glGenLists(2);
+    triangle_list = ground_list + 1;
+    
+	glNewList(ground_list, GL_COMPILE);
+	   gltDrawGround();
+	glEndList();
+	
+	glNewList(triangle_list, GL_COMPILE);
+	   gltDrawTriangle();
+	glEndList();	    
 }
 
 static void keys(SDL_keysym *keysym, unsigned int *keys_held, int flag)
@@ -247,7 +263,7 @@ static void render(void)
         /* apply camera transform, and draw the ground */
         glframe_apply_camera_transform(&camera);
         glColor3ub(255, 0, 255);
-        gltDrawGround();
+        glCallList(ground_list);
     
         /* move object back and do in place rotation */
         glTranslatef(0.0f, 0.2f, -3.5f);
@@ -256,7 +272,7 @@ static void render(void)
 
         /* draw the pyramid */
         glColor3f(1.0f, 1.0f, 1.0f);   
-        gltDrawTriangle();
+        glCallList(triangle_list);
     
     /* restore the matrix state */
     glPopMatrix();
@@ -343,10 +359,12 @@ int main(int argc, char **argv)
             current_fps = 1000 / deltaclock;
 
         static char buffer[30] = { 0 };
-        sprintf(buffer, "Textured Pyramid: %04d fps", current_fps);
+        sprintf(buffer, "Textured Pyramid: %4d fps", current_fps);
         SDL_WM_SetCaption(buffer, NULL);
 #endif
     }
+    
+    glDeleteLists(ground_list, 2);
     puts("bye!");
     
     return 0;