demos: require gl 2.0 headers

The GL_VERSION_X_Y defines tells us that we have an gl.h file that
supports OpenGL X.Y. Considering it's been almost two decades since
OpenGL 2.0 was released, let's just always assume that it's recent
enough.

Reviewed-by: Hoe Hao Cheng <haochengho12907@gmail.com>

1 files changed, 28 insertions, 42 deletions

diff --git a/src/demos/dinoshade.c b/src/demos/dinoshade.c
index ad0ef3de..f904813a 100644
--- a/src/demos/dinoshade.c
+++ b/src/demos/dinoshade.c
@@ -533,21 +533,17 @@ redraw(void)
 	 to raise the depth of the projected shadow slightly so
 	 that it does not depth buffer alias with the floor. */
       if (offsetShadow) {
-	switch (polygonOffsetVersion) {
-	case EXTENSION:
-#ifdef GL_EXT_polygon_offset
-	  glEnable(GL_POLYGON_OFFSET_EXT);
-	  break;
-#endif
-#ifdef GL_VERSION_1_1
-	case ONE_DOT_ONE:
-          glEnable(GL_POLYGON_OFFSET_FILL);
-	  break;
-#endif
-	case MISSING:
-	  /* Oh well. */
-	  break;
-	}
+         switch (polygonOffsetVersion) {
+         case EXTENSION:
+            glEnable(GL_POLYGON_OFFSET_EXT);
+            break;
+         case ONE_DOT_ONE:
+            glEnable(GL_POLYGON_OFFSET_FILL);
+            break;
+         case MISSING:
+            /* Oh well. */
+            break;
+         }
       }
 
       /* Render 50% black shadow color on top of whatever the
@@ -567,21 +563,17 @@ redraw(void)
       glEnable(GL_LIGHTING);
 
       if (offsetShadow) {
-	switch (polygonOffsetVersion) {
-#ifdef GL_EXT_polygon_offset
-	case EXTENSION:
-	  glDisable(GL_POLYGON_OFFSET_EXT);
-	  break;
-#endif
-#ifdef GL_VERSION_1_1
-	case ONE_DOT_ONE:
-          glDisable(GL_POLYGON_OFFSET_FILL);
-	  break;
-#endif
-	case MISSING:
-	  /* Oh well. */
-	  break;
-	}
+         switch (polygonOffsetVersion) {
+         case EXTENSION:
+            glDisable(GL_POLYGON_OFFSET_EXT);
+            break;
+         case ONE_DOT_ONE:
+            glDisable(GL_POLYGON_OFFSET_FILL);
+            break;
+         case MISSING:
+            /* Oh well. */
+            break;
+         }
       }
       if (stencilShadow) {
         glDisable(GL_STENCIL_TEST);
@@ -851,21 +843,15 @@ main(int argc, char **argv)
   glutAttachMenu(GLUT_RIGHT_BUTTON);
   makeDinosaur();
 
-#ifdef GL_VERSION_1_1
   if (GLAD_GL_VERSION_1_1 && !forceExtension) {
     polygonOffsetVersion = ONE_DOT_ONE;
     glPolygonOffset(-2.0, -9.0);
-  } else
-#endif
-  {
-#ifdef GL_EXT_polygon_offset
-  /* check for the polygon offset extension */
-  if (GLAD_GL_EXT_polygon_offset) {
-    polygonOffsetVersion = EXTENSION;
-    glPolygonOffsetEXT(-2.0, -0.002);
-  } else 
-#endif
-    {
+  } else {
+    /* check for the polygon offset extension */
+    if (GLAD_GL_EXT_polygon_offset) {
+      polygonOffsetVersion = EXTENSION;
+      glPolygonOffsetEXT(-2.0, -0.002);
+    } else {
       polygonOffsetVersion = MISSING;
       printf("\ndinoshine: Missing polygon offset.\n");
       printf("           Expect shadow depth aliasing artifacts.\n\n");