From c7ec12584c01a4912c722d519e70ef07b889c3aa Mon Sep 17 00:00:00 2001
From: zv0n <tom.zvon@gmail.com>
Date: Sun, 7 Mar 2021 13:18:58 +0100
Subject: [PATCH] Add texture alpha blending

---
 sdlpp/sdlpp_renderobject.cpp | 11 ++++++++++-
 sdlpp/sdlpp_renderobject.hpp |  3 +++
 sdlpp/sdlpp_texture.cpp      |  5 +++++
 sdlpp/sdlpp_texture.hpp      |  1 +
 4 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/sdlpp/sdlpp_renderobject.cpp b/sdlpp/sdlpp_renderobject.cpp
index 0d615a4..b6a5e5c 100644
--- a/sdlpp/sdlpp_renderobject.cpp
+++ b/sdlpp/sdlpp_renderobject.cpp
@@ -12,7 +12,7 @@ void RenderObject::render() {
             polygon->render( *renderer );
         if ( texture != NULL ) {
             SDL_Rect *src = NULL;
-            if(!entireTexture())
+            if ( !entireTexture() )
                 src = &src_rect;
             SDL_RenderCopy( renderer->getRendererPtr(),
                             texture->getTexturePtr(), src, &rect );
@@ -186,4 +186,13 @@ void RenderObject::copyTo( std::shared_ptr< RenderObject > other ) {
     }
     other->colidedWith.clear();
 }
+void RenderObject::setTextureAlpha( uint8_t alpha ) {
+    texture->setAlpha( alpha );
+}
+void RenderObject::setTextureSourceRect( SDL_Rect source_rect ) {
+    src_rect = source_rect;
+}
+void RenderObject::setTextureSourceRect( int x, int y, int w, int h ) {
+    setTextureSourceRect( { x, y, w, h } );
+}
 } // namespace SDLPP
diff --git a/sdlpp/sdlpp_renderobject.hpp b/sdlpp/sdlpp_renderobject.hpp
index bf96423..16184d1 100644
--- a/sdlpp/sdlpp_renderobject.hpp
+++ b/sdlpp/sdlpp_renderobject.hpp
@@ -86,6 +86,9 @@ public:
     bool isStatic();
     void setStatic( bool stat = true );
     std::shared_ptr< Renderer > getRenderer() const;
+    void setTextureAlpha( uint8_t alpha );
+    void setTextureSourceRect( SDL_Rect source_rect );
+    void setTextureSourceRect( int x, int y, int w, int h );
 
 protected:
     virtual void copyTo( std::shared_ptr< RenderObject > other );
diff --git a/sdlpp/sdlpp_texture.cpp b/sdlpp/sdlpp_texture.cpp
index 70c6e89..b9431ee 100644
--- a/sdlpp/sdlpp_texture.cpp
+++ b/sdlpp/sdlpp_texture.cpp
@@ -73,4 +73,9 @@ void Texture::setTextureFromSurface( std::shared_ptr< Renderer > &renderer,
     }
     SDL_FreeSurface( surface );
 }
+
+void Texture::setAlpha( uint8_t alpha ) {
+    SDL_SetTextureBlendMode( texture, SDL_BLENDMODE_BLEND );
+    SDL_SetTextureAlphaMod( texture, alpha );
+}
 } // namespace SDLPP
diff --git a/sdlpp/sdlpp_texture.hpp b/sdlpp/sdlpp_texture.hpp
index 7428ee5..30400b5 100644
--- a/sdlpp/sdlpp_texture.hpp
+++ b/sdlpp/sdlpp_texture.hpp
@@ -22,6 +22,7 @@ public:
              const int outline_size = -1 );
     virtual ~Texture();
     SDL_Texture *getTexturePtr();
+    void setAlpha( uint8_t alpha );
 
 private:
     void setTextureFromSurface( std::shared_ptr< Renderer > &renderer,