From d20fed8f47c5c0c1b285cd8442511ce246a2f635 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <slouken@libsdl.org>
Date: Thu, 19 Jan 2012 21:06:47 -0500
Subject: [PATCH] Added a renderer flag to expose whether a renderer supports
 render to texture.

---
 include/SDL_render.h                    | 4 +++-
 src/render/SDL_render.c                 | 4 ++--
 src/render/direct3d/SDL_render_d3d.c    | 4 ++--
 src/render/opengl/SDL_render_gl.c       | 4 ++--
 src/render/opengles/SDL_render_gles.c   | 4 ++--
 src/render/opengles2/SDL_render_gles2.c | 4 ++--
 6 files changed, 13 insertions(+), 11 deletions(-)

diff --git a/include/SDL_render.h b/include/SDL_render.h
index 51b641b61..416f4c805 100644
--- a/include/SDL_render.h
+++ b/include/SDL_render.h
@@ -65,8 +65,10 @@ typedef enum
     SDL_RENDERER_SOFTWARE = 0x00000001,         /**< The renderer is a software fallback */ 
     SDL_RENDERER_ACCELERATED = 0x00000002,      /**< The renderer uses hardware 
                                                      acceleration */
-    SDL_RENDERER_PRESENTVSYNC = 0x00000004      /**< Present is synchronized 
+    SDL_RENDERER_PRESENTVSYNC = 0x00000004,     /**< Present is synchronized 
                                                      with the refresh rate */
+    SDL_RENDERER_TARGETTEXTURE = 0x00000008     /**< The renderer supports
+                                                     rendering to texture */
 } SDL_RendererFlags;
 
 /**
diff --git a/src/render/SDL_render.c b/src/render/SDL_render.c
index 4ac83c80c..b29e90ce6 100755
--- a/src/render/SDL_render.c
+++ b/src/render/SDL_render.c
@@ -1153,10 +1153,10 @@ SDL_RenderReadPixels(SDL_Renderer * renderer, const SDL_Rect * rect,
 SDL_bool
 SDL_RenderTargetSupported(SDL_Renderer *renderer)
 {
-    if ((!renderer) || (!renderer->SetTargetTexture)) {
+    if (!renderer || !renderer->SetTargetTexture) {
         return SDL_FALSE;
     }
-    return SDL_TRUE;
+    return (renderer->info.flags & SDL_RENDERER_TARGETTEXTURE) != 0;
 }
 
 int
diff --git a/src/render/direct3d/SDL_render_d3d.c b/src/render/direct3d/SDL_render_d3d.c
index 01f78fbb4..dd356095f 100755
--- a/src/render/direct3d/SDL_render_d3d.c
+++ b/src/render/direct3d/SDL_render_d3d.c
@@ -122,7 +122,7 @@ SDL_RenderDriver D3D_RenderDriver = {
     D3D_CreateRenderer,
     {
      "direct3d",
-     (SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC),
+     (SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC | SDL_RENDERER_TARGETTEXTURE),
      1,
      {SDL_PIXELFORMAT_ARGB8888},
      0,
@@ -406,7 +406,7 @@ D3D_CreateRenderer(SDL_Window * window, Uint32 flags)
     renderer->info = D3D_RenderDriver.info;
     renderer->driverdata = data;
 
-    renderer->info.flags = SDL_RENDERER_ACCELERATED;
+    renderer->info.flags = SDL_RENDERER_ACCELERATED | SDL_RENDERER_TARGETTEXTURE;
 
     SDL_VERSION(&windowinfo.version);
     SDL_GetWindowWMInfo(window, &windowinfo);
diff --git a/src/render/opengl/SDL_render_gl.c b/src/render/opengl/SDL_render_gl.c
index 952dcc8eb..96cea8cc8 100755
--- a/src/render/opengl/SDL_render_gl.c
+++ b/src/render/opengl/SDL_render_gl.c
@@ -76,7 +76,7 @@ SDL_RenderDriver GL_RenderDriver = {
     GL_CreateRenderer,
     {
      "opengl",
-     (SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC),
+     (SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC | SDL_RENDERER_TARGETTEXTURE),
      1,
      {SDL_PIXELFORMAT_ARGB8888},
      0,
@@ -321,7 +321,7 @@ GL_CreateRenderer(SDL_Window * window, Uint32 flags)
     renderer->DestroyTexture = GL_DestroyTexture;
     renderer->DestroyRenderer = GL_DestroyRenderer;
     renderer->info = GL_RenderDriver.info;
-    renderer->info.flags = SDL_RENDERER_ACCELERATED;
+    renderer->info.flags = SDL_RENDERER_ACCELERATED | SDL_RENDERER_TARGETTEXTURE;
     renderer->driverdata = data;
     renderer->window = window;
 
diff --git a/src/render/opengles/SDL_render_gles.c b/src/render/opengles/SDL_render_gles.c
index 66f770181..3dc260e64 100755
--- a/src/render/opengles/SDL_render_gles.c
+++ b/src/render/opengles/SDL_render_gles.c
@@ -89,7 +89,7 @@ SDL_RenderDriver GLES_RenderDriver = {
     GLES_CreateRenderer,
     {
      "opengles",
-     (SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC),
+     (SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC | SDL_RENDERER_TARGETTEXTURE),
      1,
      {SDL_PIXELFORMAT_ABGR8888},
      0,
@@ -372,7 +372,7 @@ GLES_CreateRenderer(SDL_Window * window, Uint32 flags)
     renderer->DestroyTexture = GLES_DestroyTexture;
     renderer->DestroyRenderer = GLES_DestroyRenderer;
     renderer->info = GLES_RenderDriver.info;
-    renderer->info.flags = SDL_RENDERER_ACCELERATED;
+    renderer->info.flags = SDL_RENDERER_ACCELERATED | SDL_RENDERER_TARGETTEXTURE;
     renderer->driverdata = data;
     renderer->window = window;
     renderer->SetTargetTexture = GLES_SetTargetTexture;
diff --git a/src/render/opengles2/SDL_render_gles2.c b/src/render/opengles2/SDL_render_gles2.c
index 3a767644f..fd36520b4 100755
--- a/src/render/opengles2/SDL_render_gles2.c
+++ b/src/render/opengles2/SDL_render_gles2.c
@@ -40,7 +40,7 @@ SDL_RenderDriver GLES2_RenderDriver = {
     GLES2_CreateRenderer,
     {
         "opengles2",
-        (SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC),
+        (SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC | SDL_RENDERER_TARGETTEXTURE),
         4,
         {SDL_PIXELFORMAT_ABGR8888,
         SDL_PIXELFORMAT_ARGB8888,
@@ -1447,7 +1447,7 @@ GLES2_CreateRenderer(SDL_Window *window, Uint32 flags)
         return NULL;
     }
     renderer->info = GLES2_RenderDriver.info;
-    renderer->info.flags = SDL_RENDERER_ACCELERATED;
+    renderer->info.flags = SDL_RENDERER_ACCELERATED | SDL_RENDERER_TARGETTEXTURE;
     renderer->driverdata = rdata;
     renderer->window = window;