From b81ef1c429bbd34536f30c1522f1915996476078 Mon Sep 17 00:00:00 2001
From: Brian <brian.paul@tungstengraphics.com>
Date: Fri, 8 Feb 2008 16:56:21 -0700
Subject: [PATCH] refactor code, export _mesa_generate_mipmap_level()

---
 src/mesa/main/mipmap.c | 98 ++++++++++++++++++++++++------------------
 src/mesa/main/mipmap.h | 11 +++++
 2 files changed, 67 insertions(+), 42 deletions(-)

diff --git a/src/mesa/main/mipmap.c b/src/mesa/main/mipmap.c
index 981da5dd89e..ed7795aef93 100644
--- a/src/mesa/main/mipmap.c
+++ b/src/mesa/main/mipmap.c
@@ -841,6 +841,59 @@ make_2d_stack_mipmap(GLenum datatype, GLuint comps, GLint border,
 }
 
 
+/**
+ * Down-sample a texture image to produce the next lower mipmap level.
+ */
+void
+_mesa_generate_mipmap_level(GLenum target,
+                            GLenum datatype, GLuint comps,
+                            GLint border,
+                            GLint srcWidth, GLint srcHeight, GLint srcDepth,
+                            const GLubyte *srcData,
+                            GLint dstWidth, GLint dstHeight, GLint dstDepth,
+                            GLubyte *dstData)
+{
+   switch (target) {
+   case GL_TEXTURE_1D:
+      make_1d_mipmap(datatype, comps, border,
+                     srcWidth, srcData,
+                     dstWidth, dstData);
+      break;
+   case GL_TEXTURE_2D:
+   case GL_TEXTURE_CUBE_MAP_POSITIVE_X_ARB:
+   case GL_TEXTURE_CUBE_MAP_NEGATIVE_X_ARB:
+   case GL_TEXTURE_CUBE_MAP_POSITIVE_Y_ARB:
+   case GL_TEXTURE_CUBE_MAP_NEGATIVE_Y_ARB:
+   case GL_TEXTURE_CUBE_MAP_POSITIVE_Z_ARB:
+   case GL_TEXTURE_CUBE_MAP_NEGATIVE_Z_ARB:
+      make_2d_mipmap(datatype, comps, border,
+                     srcWidth, srcHeight, srcData,
+                     dstWidth, dstHeight, dstData);
+      break;
+   case GL_TEXTURE_3D:
+      make_3d_mipmap(datatype, comps, border,
+                     srcWidth, srcHeight, srcDepth, srcData,
+                     dstWidth, dstHeight, dstDepth, dstData);
+      break;
+   case GL_TEXTURE_1D_ARRAY_EXT:
+      make_1d_stack_mipmap(datatype, comps, border,
+                           srcWidth, srcData,
+                           dstWidth, dstHeight, dstData);
+      break;
+   case GL_TEXTURE_2D_ARRAY_EXT:
+      make_2d_stack_mipmap(datatype, comps, border,
+                           srcWidth, srcHeight, srcData,
+                           dstWidth, dstHeight, dstDepth, dstData);
+      break;
+   case GL_TEXTURE_RECTANGLE_NV:
+      /* no mipmaps, do nothing */
+      break;
+   default:
+      _mesa_problem(NULL, "bad target in _mesa_generate_mipmap_level");
+   }
+}
+
+
 /**
  * For GL_SGIX_generate_mipmap:
  * Generate a complete set of mipmaps from texObj's base-level image.
@@ -1032,48 +1085,9 @@ _mesa_generate_mipmap(GLcontext *ctx, GLenum target,
          dstData = (GLubyte *) dstImage->Data;
       }
 
-      /*
-       * We use simple 2x2 averaging to compute the next mipmap level.
-       */
-      switch (target) {
-         case GL_TEXTURE_1D:
-            make_1d_mipmap(datatype, comps, border,
-                           srcWidth, srcData,
-                           dstWidth, dstData);
-            break;
-         case GL_TEXTURE_2D:
-         case GL_TEXTURE_CUBE_MAP_POSITIVE_X_ARB:
-         case GL_TEXTURE_CUBE_MAP_NEGATIVE_X_ARB:
-         case GL_TEXTURE_CUBE_MAP_POSITIVE_Y_ARB:
-         case GL_TEXTURE_CUBE_MAP_NEGATIVE_Y_ARB:
-         case GL_TEXTURE_CUBE_MAP_POSITIVE_Z_ARB:
-         case GL_TEXTURE_CUBE_MAP_NEGATIVE_Z_ARB:
-            make_2d_mipmap(datatype, comps, border,
-                           srcWidth, srcHeight, srcData,
-                           dstWidth, dstHeight, dstData);
-            break;
-         case GL_TEXTURE_3D:
-            make_3d_mipmap(datatype, comps, border,
-                           srcWidth, srcHeight, srcDepth, srcData,
-                           dstWidth, dstHeight, dstDepth, dstData);
-            break;
-         case GL_TEXTURE_1D_ARRAY_EXT:
-            make_1d_stack_mipmap(datatype, comps, border,
-                                 srcWidth, srcData,
-                                 dstWidth, dstHeight, dstData);
-            break;
-         case GL_TEXTURE_2D_ARRAY_EXT:
-            make_2d_stack_mipmap(datatype, comps, border,
-                                 srcWidth, srcHeight, srcData,
-                                 dstWidth, dstHeight, dstDepth, dstData);
-            break;
-         case GL_TEXTURE_RECTANGLE_NV:
-            /* no mipmaps, do nothing */
-            break;
-         default:
-            _mesa_problem(ctx, "bad dimensions in _mesa_generate_mipmaps");
-            return;
-      }
+      _mesa_generate_mipmap_level(target, datatype, comps, border,
+                                  srcWidth, srcHeight, srcDepth, srcData,
+                                  dstWidth, dstHeight, dstDepth, dstData);
 
       if (dstImage->IsCompressed) {
          GLubyte *temp;
diff --git a/src/mesa/main/mipmap.h b/src/mesa/main/mipmap.h
index 46e16902c86..b6491f55073 100644
--- a/src/mesa/main/mipmap.h
+++ b/src/mesa/main/mipmap.h
@@ -28,6 +28,17 @@
 
 #include "mtypes.h"
 
+
+extern void
+_mesa_generate_mipmap_level(GLenum target,
+                            GLenum datatype, GLuint comps,
+                            GLint border,
+                            GLint srcWidth, GLint srcHeight, GLint srcDepth,
+                            const GLubyte *srcData,
+                            GLint dstWidth, GLint dstHeight, GLint dstDepth,
+                            GLubyte *dstData);
+
+
 extern void
 _mesa_generate_mipmap(GLcontext *ctx, GLenum target,
                       struct gl_texture_object *texObj);
-- 
2.30.2