From 424d34f84f4b2d178ef42a51a99c573235fa231e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Stefan=20D=C3=B6singer?= <stefan@codeweavers.com>
Date: Thu, 1 Mar 2007 01:42:50 +0100
Subject: [PATCH] wined3d: Use the source surface's texture for writing the
 backup.

The hwstretch blit code creates a new texture each time it is called
to back up the back buffer and releases it afterwards. It is more
efficient to keep the texture and release it with the surface.
---
 dlls/wined3d/surface.c | 46 +++++++++++++++++++++++++-----------------
 1 file changed, 27 insertions(+), 19 deletions(-)

diff --git a/dlls/wined3d/surface.c b/dlls/wined3d/surface.c
index 8e5bd888037..95b7cc78c55 100644
--- a/dlls/wined3d/surface.c
+++ b/dlls/wined3d/surface.c
@@ -2251,7 +2251,7 @@ static inline void fb_copy_to_texture_direct(IWineD3DSurfaceImpl *This, IWineD3D
 
 /* Uses the hardware to stretch and flip the image */
 static inline void fb_copy_to_texture_hwstretch(IWineD3DSurfaceImpl *This, IWineD3DSurface *SrcSurface, IWineD3DSwapChainImpl *swapchain, WINED3DRECT *srect, WINED3DRECT *drect, BOOL upsidedown) {
-    GLuint backup, src;
+    GLuint src, backup = 0;
     IWineD3DDeviceImpl *myDevice = This->resource.wineD3DDevice;
     IWineD3DSurfaceImpl *Src = (IWineD3DSurfaceImpl *) SrcSurface;
     float left, right, top, bottom; /* Texture coordinates */
@@ -2263,22 +2263,27 @@ static inline void fb_copy_to_texture_hwstretch(IWineD3DSurfaceImpl *This, IWine
     ENTER_GL();
     ActivateContext(myDevice, SrcSurface, CTXUSAGE_BLIT);
 
-    /* Backup the back buffer and copy the source buffer into a texture to draw an upside down stretched quad. If
-     * we are reading from the back buffer, the backup can be used as source texture
-     */
-    glGenTextures(1, &backup);
-    checkGLcall("glGenTextures(1, &backup)");
-    glBindTexture(GL_TEXTURE_2D, backup);
-    checkGLcall("glBindTexture(GL_TEXTURE_2D, backup)");
+    if(!swapchain && wined3d_settings.offscreen_rendering_mode == ORM_FBO) {
+        glGenTextures(1, &backup);
+        checkGLcall("glGenTextures\n");
+        glBindTexture(GL_TEXTURE_2D, backup);
+        checkGLcall("glBindTexture(Src->glDescription.target, Src->glDescription.textureName)");
+    } else {
+        /* Backup the back buffer and copy the source buffer into a texture to draw an upside down stretched quad. If
+         * we are reading from the back buffer, the backup can be used as source texture
+         */
+        if(Src->glDescription.textureName == 0) {
+            /* Get it a description */
+            IWineD3DSurface_PreLoad(SrcSurface);
+        }
+        glBindTexture(GL_TEXTURE_2D, Src->glDescription.textureName);
+        checkGLcall("glBindTexture(Src->glDescription.target, Src->glDescription.textureName)");
+    }
 
     glReadBuffer(GL_BACK);
     checkGLcall("glReadBuffer(GL_BACK)");
 
     /* TODO: Only back up the part that will be overwritten */
-    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, Src->pow2Width, Src->pow2Height, 0,
-                 GL_RGBA, GL_UNSIGNED_BYTE, NULL);
-    checkGLcall("glTexImage2D");
-
     glCopyTexSubImage2D(GL_TEXTURE_2D, 0,
                         0, 0 /* read offsets */,
                         0, 0,
@@ -2287,13 +2292,14 @@ static inline void fb_copy_to_texture_hwstretch(IWineD3DSurfaceImpl *This, IWine
 
     checkGLcall("glCopyTexSubImage2D");
 
+    /* No issue with overriding these - the sampler is dirty due to blit usage */
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
     checkGLcall("glTexParameteri");
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
     checkGLcall("glTexParameteri");
 
-    if(!swapchain || (IWineD3DSurface *) This == swapchain->backBuffer[0]) {
-        src = backup;
+    if(!swapchain || (IWineD3DSurface *) Src == swapchain->backBuffer[0]) {
+        src = backup ? backup : Src->glDescription.textureName;
     } else {
         glReadBuffer(GL_FRONT);
         checkGLcall("glReadBuffer(GL_FRONT)");
@@ -2370,8 +2376,8 @@ static inline void fb_copy_to_texture_hwstretch(IWineD3DSurfaceImpl *This, IWine
     checkGLcall("glCopyTexSubImage2D");
 
     /* Write the back buffer backup back */
-    glBindTexture(GL_TEXTURE_2D, backup);
-    checkGLcall("glBindTexture(GL_TEXTURE_2D, backup)");
+    glBindTexture(GL_TEXTURE_2D, backup ? backup : Src->glDescription.textureName);
+    checkGLcall("glBindTexture(GL_TEXTURE_2D, Src->glDescription.textureName)");
 
     glBegin(GL_QUADS);
         /* top left */
@@ -2392,12 +2398,14 @@ static inline void fb_copy_to_texture_hwstretch(IWineD3DSurfaceImpl *This, IWine
     glEnd();
 
     /* Cleanup */
-    if(src != backup) {
+    if(src != Src->glDescription.textureName && src != backup) {
         glDeleteTextures(1, &src);
         checkGLcall("glDeleteTextures(1, &src)");
     }
-    glDeleteTextures(1, &backup);
-    checkGLcall("glDeleteTextures(1, &backup)");
+    if(backup) {
+        glDeleteTextures(1, &backup);
+        checkGLcall("glDeleteTextures(1, &backup)");
+    }
     LEAVE_GL();
 }