From 64ac53e60065dd058c799e6838bbc609248bab56 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <slouken@libsdl.org>
Date: Thu, 17 Feb 2011 02:23:48 -0800
Subject: [PATCH] Implemented OpenGL ES RenderClear()

---
 src/render/SDL_render.c                 | 15 ---------------
 src/render/opengles/SDL_render_gles.c   | 17 +++++++++++++++++
 src/render/opengles2/SDL_render_gles2.c | 16 ++++++++--------
 3 files changed, 25 insertions(+), 23 deletions(-)

diff --git a/src/render/SDL_render.c b/src/render/SDL_render.c
index 04954948d..45eedcc2c 100755
--- a/src/render/SDL_render.c
+++ b/src/render/SDL_render.c
@@ -848,21 +848,6 @@ SDL_RenderClear(SDL_Renderer * renderer)
 {
     CHECK_RENDERER_MAGIC(renderer, -1);
 
-    if (!renderer->RenderClear) {
-        SDL_BlendMode blendMode = renderer->blendMode;
-        int status;
-
-        if (blendMode >= SDL_BLENDMODE_BLEND) {
-            SDL_SetRenderDrawBlendMode(renderer, SDL_BLENDMODE_NONE);
-        }
-
-        status = SDL_RenderFillRect(renderer, NULL);
-
-        if (blendMode >= SDL_BLENDMODE_BLEND) {
-            SDL_SetRenderDrawBlendMode(renderer, blendMode);
-        }
-        return status;
-    }
     return renderer->RenderClear(renderer);
 }
 
diff --git a/src/render/opengles/SDL_render_gles.c b/src/render/opengles/SDL_render_gles.c
index cf9d1e6ee..3967c6c24 100644
--- a/src/render/opengles/SDL_render_gles.c
+++ b/src/render/opengles/SDL_render_gles.c
@@ -54,6 +54,7 @@ static int GLES_LockTexture(SDL_Renderer * renderer, SDL_Texture * texture,
 static void GLES_UnlockTexture(SDL_Renderer * renderer,
                                SDL_Texture * texture);
 static int GLES_UpdateViewport(SDL_Renderer * renderer);
+static int GLES_RenderClear(SDL_Renderer * renderer);
 static int GLES_RenderDrawPoints(SDL_Renderer * renderer,
                                  const SDL_Point * points, int count);
 static int GLES_RenderDrawLines(SDL_Renderer * renderer,
@@ -180,6 +181,7 @@ GLES_CreateRenderer(SDL_Window * window, Uint32 flags)
     renderer->LockTexture = GLES_LockTexture;
     renderer->UnlockTexture = GLES_UnlockTexture;
     renderer->UpdateViewport = GLES_UpdateViewport;
+    renderer->RenderClear = GLES_RenderClear;
     renderer->RenderDrawPoints = GLES_RenderDrawPoints;
     renderer->RenderDrawLines = GLES_RenderDrawLines;
     renderer->RenderFillRects = GLES_RenderFillRects;
@@ -451,6 +453,21 @@ GLES_UpdateViewport(SDL_Renderer * renderer)
     return 0;
 }
 
+static int
+GLES_RenderClear(SDL_Renderer * renderer)
+{
+    GLES_ActivateRenderer(renderer);
+
+    glClearColor((GLfloat) renderer->r * inv255f,
+                 (GLfloat) renderer->g * inv255f,
+                 (GLfloat) renderer->b * inv255f,
+                 (GLfloat) renderer->a * inv255f);
+
+    glClear(GL_COLOR_BUFFER_BIT);
+
+    return 0;
+}
+
 static void
 GLES_SetBlendMode(GLES_RenderData * data, int blendMode)
 {
diff --git a/src/render/opengles2/SDL_render_gles2.c b/src/render/opengles2/SDL_render_gles2.c
index a56ae7031..b4dc4c03e 100644
--- a/src/render/opengles2/SDL_render_gles2.c
+++ b/src/render/opengles2/SDL_render_gles2.c
@@ -770,19 +770,19 @@ static int GLES2_RenderCopy(SDL_Renderer *renderer, SDL_Texture *texture, const
                             const SDL_Rect *dstrect);
 static void GLES2_RenderPresent(SDL_Renderer *renderer);
 
+
 static int
-GLES2_RenderClear(SDL_Renderer *renderer)
+GLES2_RenderClear(SDL_Renderer * renderer)
 {
-    float r = (float)renderer->r * inv255f;
-    float g = (float)renderer->g * inv255f;
-    float b = (float)renderer->b * inv255f;
-    float a = (float)renderer->a * inv255f;
-
     GLES2_ActivateRenderer(renderer);
 
-    /* Clear the backbuffer with the selected color */
-    glClearColor(r, g, b, a);
+    glClearColor((GLfloat) renderer->r * inv255f,
+                 (GLfloat) renderer->g * inv255f,
+                 (GLfloat) renderer->b * inv255f,
+                 (GLfloat) renderer->a * inv255f);
+
     glClear(GL_COLOR_BUFFER_BIT);
+
     return 0;
 }