WARNING: BIG rewrite of rlgl module

This commit implements a big update of rlgl module, intended to optimize some parts. This change could break some code bases... hopefully not, but it could.
The BIG changes to the module are:
 - Replaced LINES-TRIANGLES-QUADS buffers by a single one, now all vertex data is accumulated on a single buffer and managed with registered draw calls. LINES-TRIANGLES-QUADS could be used the same way as before, rlgl will manage them carefully. That's a big improvement of the system.
 - Support multi-buffering if required. Just define MAX_BATCH_BUFFERING desired size (currently set to 1 batch). Should be enough for most of the situations.
 - Removed temporal accumulative buffers for matrix transformations, now transformations are directly applied to vertex when on rlVertex3f()
 - Reviewed rlPushMatrix()/rlPopMatrix() to be consistent with OpenGL 1.1, probably I should remove that ancient behaviour but... well, it was not consistent and now it is.
 - Minor tweaks: LoadText(), I broke it in last update... also multiple comments reviewed.
 - TODO: MAX_BATCH_ELEMENTS checking should probably be reviewed... done some tests and it works but...

1 files changed, 9 insertions, 8 deletions

diff --git a/examples/shapes/shapes_basic_shapes.c b/examples/shapes/shapes_basic_shapes.c
index 4b7cc261..67eea9d5 100644
--- a/examples/shapes/shapes_basic_shapes.c
+++ b/examples/shapes/shapes_basic_shapes.c
@@ -39,26 +39,27 @@ int main()
 
             DrawText("some basic shapes available on raylib", 20, 20, 20, DARKGRAY);
 
-            DrawLine(18, 42, screenWidth - 18, 42, BLACK);
-
             DrawCircle(screenWidth/4, 120, 35, DARKBLUE);
-            DrawCircleGradient(screenWidth/4, 220, 60, GREEN, SKYBLUE);
-            DrawCircleLines(screenWidth/4, 340, 80, DARKBLUE);
 
             DrawRectangle(screenWidth/4*2 - 60, 100, 120, 60, RED);
+            DrawRectangleLines(screenWidth/4*2 - 40, 320, 80, 60, ORANGE);  // NOTE: Uses QUADS internally, not lines
             DrawRectangleGradientH(screenWidth/4*2 - 90, 170, 180, 130, MAROON, GOLD);
-            DrawRectangleLines(screenWidth/4*2 - 40, 320, 80, 60, ORANGE);
 
             DrawTriangle((Vector2){screenWidth/4*3, 80},
                          (Vector2){screenWidth/4*3 - 60, 150},
                          (Vector2){screenWidth/4*3 + 60, 150}, VIOLET);
 
+            DrawPoly((Vector2){screenWidth/4*3, 320}, 6, 80, 0, BROWN);
+
+            DrawCircleGradient(screenWidth/4, 220, 60, GREEN, SKYBLUE);
+
+            // NOTE: We draw all LINES based shapes together to optimize internal drawing,
+            // this way, all LINES are rendered in a single draw pass
+            DrawLine(18, 42, screenWidth - 18, 42, BLACK);
+            DrawCircleLines(screenWidth/4, 340, 80, DARKBLUE);
             DrawTriangleLines((Vector2){screenWidth/4*3, 160},
                               (Vector2){screenWidth/4*3 - 20, 230},
                               (Vector2){screenWidth/4*3 + 20, 230}, DARKBLUE);
-
-            DrawPoly((Vector2){screenWidth/4*3, 320}, 6, 80, 0, BROWN);
-
         EndDrawing();
         //----------------------------------------------------------------------------------
     }