From 12d69fca096facf0ddb4642faaed4d5f02d76848 Mon Sep 17 00:00:00 2001
From: Brian Paul <brianp@vmware.com>
Date: Mon, 31 Oct 2011 10:52:57 -0600
Subject: [PATCH] swrast: implement GL_ARB_texture_storage

---
 src/mesa/drivers/common/driverfuncs.c |  3 +++
 src/mesa/main/extensions.c            |  1 +
 src/mesa/swrast/s_texture.c           | 32 ++++++++++++++++++++++++++++++++
 src/mesa/swrast/swrast.h              |  7 +++++++
 4 files changed, 43 insertions(+)

diff --git a/src/mesa/drivers/common/driverfuncs.c b/src/mesa/drivers/common/driverfuncs.c
index 80db4bd..9202716 100644
--- a/src/mesa/drivers/common/driverfuncs.c
+++ b/src/mesa/drivers/common/driverfuncs.c
@@ -218,6 +218,9 @@ _mesa_init_driver_functions(struct dd_function_table *driver)
    driver->EndList = NULL;
    driver->BeginCallList = NULL;
    driver->EndCallList = NULL;
+
+   /* GL_ARB_texture_storage */
+   driver->AllocTextureStorage = _swrast_AllocTextureStorage;
 }
 
 
diff --git a/src/mesa/main/extensions.c b/src/mesa/main/extensions.c
index 14f6f1f..b0fe4c3 100644
--- a/src/mesa/main/extensions.c
+++ b/src/mesa/main/extensions.c
@@ -422,6 +422,7 @@ _mesa_enable_sw_extensions(struct gl_context *ctx)
    ctx->Extensions.ARB_texture_non_power_of_two = GL_TRUE;
    ctx->Extensions.ARB_texture_rg = GL_TRUE;
    ctx->Extensions.ARB_texture_compression_rgtc = GL_TRUE;
+   ctx->Extensions.ARB_texture_storage = GL_TRUE;
    ctx->Extensions.ARB_vertex_array_object = GL_TRUE;
 #if FEATURE_ARB_vertex_program
    ctx->Extensions.ARB_vertex_program = GL_TRUE;
diff --git a/src/mesa/swrast/s_texture.c b/src/mesa/swrast/s_texture.c
index fb1edb3..ba67c6f 100644
--- a/src/mesa/swrast/s_texture.c
+++ b/src/mesa/swrast/s_texture.c
@@ -359,3 +359,35 @@ _swrast_unmap_renderbuffers(struct gl_context *ctx)
    if (ctx->ReadBuffer != ctx->DrawBuffer)
       map_unmap_renderbuffers(ctx, ctx->ReadBuffer, GL_FALSE);
 }
+
+
+
+/**
+ * Called via ctx->Driver.AllocTextureStorage()
+ * Just have to allocate memory for the texture images.
+ */
+GLboolean
+_swrast_AllocTextureStorage(struct gl_context *ctx,
+                            struct gl_texture_object *texObj,
+                            GLsizei levels, GLsizei width,
+                            GLsizei height, GLsizei depth)
+{
+   const GLint numFaces = (texObj->Target == GL_TEXTURE_CUBE_MAP) ? 6 : 1;
+   GLint face, level;
+
+   for (face = 0; face < numFaces; face++) {
+      for (level = 0; level < levels; level++) {
+         struct gl_texture_image *texImage = texObj->Image[face][level];
+         if (!_swrast_alloc_texture_image_buffer(ctx, texImage,
+                                                 texImage->TexFormat,
+                                                 texImage->Width,
+                                                 texImage->Height,
+                                                 texImage->Depth)) {
+            return GL_FALSE;
+         }
+      }
+   }
+
+   return GL_TRUE;
+}
+
diff --git a/src/mesa/swrast/swrast.h b/src/mesa/swrast/swrast.h
index 06cc651..08d565b 100644
--- a/src/mesa/swrast/swrast.h
+++ b/src/mesa/swrast/swrast.h
@@ -249,6 +249,13 @@ _swrast_finish_render_texture(struct gl_context *ctx,
 
 
 
+extern GLboolean
+_swrast_AllocTextureStorage(struct gl_context *ctx,
+                            struct gl_texture_object *texObj,
+                            GLsizei levels, GLsizei width,
+                            GLsizei height, GLsizei depth);
+
+
 /**
  * The driver interface for the software rasterizer.
  * XXX this may go away.
-- 
2.7.4