From be84d53d445419062173216ffc7e5e111fe23353 Mon Sep 17 00:00:00 2001
From: Kenneth Graunke <kenneth@whitecape.org>
Date: Wed, 5 Mar 2014 19:19:32 -0800
Subject: [PATCH] meta: Refactor code for binding a texture image to the FBO.

Almost the exact same code appeared twice, and it needs to expand to
handle additional texture targets.  Refactor it to tidy up the code and
avoid duplicating more work in the future.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Anuj Phogat <anuj.phogat@gmail.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
---
 .../drivers/common/meta_generate_mipmap.c     | 81 ++++++++-----------
 1 file changed, 35 insertions(+), 46 deletions(-)

diff --git a/src/mesa/drivers/common/meta_generate_mipmap.c b/src/mesa/drivers/common/meta_generate_mipmap.c
index 9bce97d6561..5bdf1270bca 100644
--- a/src/mesa/drivers/common/meta_generate_mipmap.c
+++ b/src/mesa/drivers/common/meta_generate_mipmap.c
@@ -44,6 +44,37 @@
 #include "main/viewport.h"
 #include "drivers/common/meta.h"
 
+/**
+ * Bind a particular texture level/layer to mipmap->FBO's GL_COLOR_ATTACHMENT0.
+ */
+static void
+bind_fbo_image(struct gl_texture_object *texObj, GLenum target, GLuint level)
+{
+   switch (target) {
+   case GL_TEXTURE_1D:
+      _mesa_FramebufferTexture1D(GL_FRAMEBUFFER,
+                                 GL_COLOR_ATTACHMENT0,
+                                 target,
+                                 texObj->Name,
+                                 level);
+      break;
+   case GL_TEXTURE_3D:
+      _mesa_FramebufferTexture3D(GL_FRAMEBUFFER,
+                                 GL_COLOR_ATTACHMENT0,
+                                 target,
+                                 texObj->Name,
+                                 level,
+                                 0); /* XXX: Unfinished */
+      break;
+   default: /* 2D / cube */
+      _mesa_FramebufferTexture2D(GL_FRAMEBUFFER,
+                                 GL_COLOR_ATTACHMENT0,
+                                 target,
+                                 texObj->Name,
+                                 level);
+   }
+}
+
 /**
  * Check if the call to _mesa_meta_GenerateMipmap() will require a
  * software fallback.  The fallback path will require that the texture
@@ -104,26 +135,7 @@ fallback_required(struct gl_context *ctx, GLenum target,
       _mesa_GenFramebuffers(1, &mipmap->FBO);
    _mesa_BindFramebuffer(GL_FRAMEBUFFER_EXT, mipmap->FBO);
 
-   if (target == GL_TEXTURE_1D) {
-      _mesa_FramebufferTexture1D(GL_FRAMEBUFFER_EXT,
-                                    GL_COLOR_ATTACHMENT0_EXT,
-                                    target, texObj->Name, srcLevel);
-   }
-#if 0
-   /* other work is needed to enable 3D mipmap generation */
-   else if (target == GL_TEXTURE_3D) {
-      GLint zoffset = 0;
-      _mesa_FramebufferTexture3D(GL_FRAMEBUFFER_EXT,
-                                    GL_COLOR_ATTACHMENT0_EXT,
-                                    target, texObj->Name, srcLevel, zoffset);
-   }
-#endif
-   else {
-      /* 2D / cube */
-      _mesa_FramebufferTexture2D(GL_FRAMEBUFFER_EXT,
-                                    GL_COLOR_ATTACHMENT0_EXT,
-                                    target, texObj->Name, srcLevel);
-   }
+   bind_fbo_image(texObj, target, srcLevel);
 
    status = _mesa_CheckFramebufferStatus(GL_FRAMEBUFFER_EXT);
 
@@ -271,7 +283,6 @@ _mesa_meta_GenerateMipmap(struct gl_context *ctx, GLenum target,
       const GLuint srcLevel = dstLevel - 1;
       GLsizei srcWidth, srcHeight, srcDepth;
       GLsizei dstWidth, dstHeight, dstDepth;
-      GLenum status;
 
       srcImage = _mesa_select_tex_image(ctx, texObj, faceTarget, srcLevel);
       assert(srcImage->Border == 0);
@@ -312,35 +323,13 @@ _mesa_meta_GenerateMipmap(struct gl_context *ctx, GLenum target,
       /* limit minification to src level */
       _mesa_TexParameteri(target, GL_TEXTURE_MAX_LEVEL, srcLevel);
 
-      /* Set to draw into the current dstLevel */
-      if (target == GL_TEXTURE_1D) {
-         _mesa_FramebufferTexture1D(GL_FRAMEBUFFER_EXT,
-                                       GL_COLOR_ATTACHMENT0_EXT,
-                                       target,
-                                       texObj->Name,
-                                       dstLevel);
-      }
-      else if (target == GL_TEXTURE_3D) {
-         GLint zoffset = 0; /* XXX unfinished */
-         _mesa_FramebufferTexture3D(GL_FRAMEBUFFER_EXT,
-                                       GL_COLOR_ATTACHMENT0_EXT,
-                                       target,
-                                       texObj->Name,
-                                       dstLevel, zoffset);
-      } else {
-         /* 2D / cube */
-         _mesa_FramebufferTexture2D(GL_FRAMEBUFFER_EXT,
-                                       GL_COLOR_ATTACHMENT0_EXT,
-                                       faceTarget,
-                                       texObj->Name,
-                                       dstLevel);
-      }
+      bind_fbo_image(texObj, faceTarget, dstLevel);
 
       _mesa_DrawBuffer(GL_COLOR_ATTACHMENT0_EXT);
 
       /* sanity check */
-      status = _mesa_CheckFramebufferStatus(GL_FRAMEBUFFER_EXT);
-      if (status != GL_FRAMEBUFFER_COMPLETE_EXT) {
+      if (_mesa_CheckFramebufferStatus(GL_FRAMEBUFFER) !=
+          GL_FRAMEBUFFER_COMPLETE) {
          _mesa_problem(ctx, "Unexpected incomplete framebuffer in "
                        "_mesa_meta_GenerateMipmap()");
          break;
-- 
2.30.2