pyramid: draw ground

1 files changed, 21 insertions, 1 deletions

diff --git a/sdl/pyramid.c b/sdl/pyramid.c
index b25d073..b2c9696 100644
--- a/sdl/pyramid.c
+++ b/sdl/pyramid.c
@@ -159,6 +159,24 @@ void processEvents()
     }
 }
 
+static void draw_ground(void)
+{
+    GLfloat fExtent = 20.0f;
+    GLfloat fStep = 0.5f;
+    GLfloat y = -0.4f;
+    GLfloat iLine;
+
+    glBegin(GL_LINES);
+    for (iLine = -fExtent; iLine <= fExtent; iLine += fStep)
+    {
+        glVertex3f(iLine, y, fExtent);
+        glVertex3f(iLine, y, -fExtent);
+        glVertex3f(fExtent, y, iLine);
+        glVertex3f(-fExtent, y, iLine);
+    }
+    glEnd();
+}
+
 static void render(void)
 {
     M3DVector3f vNormal;
@@ -176,7 +194,7 @@ static void render(void)
     /* save the matrix state and do the rotations */
     glPushMatrix();
         /* move object back and do in place rotation */
-        glTranslatef(0.0f, 0.4f, -4.0f);
+        glTranslatef(0.0f, 0.2f, -3.5f);
         glRotatef(xRot, 1.0f, 0.0f, 0.0f);
         glRotatef(yRot, 0.0f, 1.0f, 0.0f);
 
@@ -244,6 +262,8 @@ static void render(void)
     
     /* restore the matrix state */
     glPopMatrix();
+    
+    draw_ground();
 
     /* buffer swap */
     SDL_GL_SwapBuffers();