Support custom texture on shapes drawing

By default, internal white texture was used to draw most of the shapes; some time ago, support for white font character from default internal font was added. That way, all basic drawing (shapes, text) could be performed without a texture change and in a single drawing pass.

Now, we move a step further and we allow configuring the texture (and rectangle) used to do the shapes drawing.

src/raylib.h

@@ -970,7 +970,7 @@ RLAPI void DrawCircleLines(int centerX, int centerY, float radius, Color color);
 RLAPI void DrawRectangle(int posX, int posY, int width, int height, Color color);                        // Draw a color-filled rectangle
 RLAPI void DrawRectangleV(Vector2 position, Vector2 size, Color color);                                  // Draw a color-filled rectangle (Vector version)
 RLAPI void DrawRectangleRec(Rectangle rec, Color color);                                                 // Draw a color-filled rectangle
-RLAPI void DrawRectanglePro(Rectangle rec, Vector2 origin, float rotation, Color color);                 // Draw a color-filled rectangle with pro parameters
+RLAPI void DrawRectanglePro(Rectangle rec, Vector2 origin, float rotation, Color colors[static 4]);      // Draw a color-filled rectangle with pro parameters
 RLAPI void DrawRectangleGradientV(int posX, int posY, int width, int height, Color color1, Color color2);// Draw a vertical-gradient-filled rectangle
 RLAPI void DrawRectangleGradientH(int posX, int posY, int width, int height, Color color1, Color color2);// Draw a horizontal-gradient-filled rectangle
 RLAPI void DrawRectangleGradientEx(Rectangle rec, Color col1, Color col2, Color col3, Color col4);       // Draw a gradient-filled rectangle with custom vertex colors
@@ -982,6 +982,8 @@ RLAPI void DrawPoly(Vector2 center, int sides, float radius, float rotation, Col
 RLAPI void DrawPolyEx(Vector2 *points, int numPoints, Color color);                                      // Draw a closed polygon defined by points
 RLAPI void DrawPolyExLines(Vector2 *points, int numPoints, Color color);                                 // Draw polygon lines
 
+RLAPI void SetShapesTexture(Texture2D texture, Rectangle source);                                        // Define default texture used to draw shapes
+
 // Basic shapes collision detection functions
 RLAPI bool CheckCollisionRecs(Rectangle rec1, Rectangle rec2);                                           // Check collision between two rectangles
 RLAPI bool CheckCollisionCircles(Vector2 center1, float radius1, Vector2 center2, float radius2);        // Check collision between two circles