Mesa (10.2): meta/blit: Add stencil texturing mode save and restore

[Ian Romanick]

Module: Mesa
Branch: 10.2
Commit: 75ae4fff35c623b79e4f3b940bfa0702a26dab62
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=75ae4fff35c623b79e4f3b940bfa0702a26dab62

Author: Topi Pohjolainen <topi.pohjolainen at intel.com>
Date:   Wed May 21 11:43:56 2014 +0300

meta/blit: Add stencil texturing mode save and restore

v2 (Ken): Only restore the mode if it has changed.

Signed-off-by: Topi Pohjolainen <topi.pohjolainen at intel.com>
Cc: "10.2" <mesa-stable at lists.freedesktop.org>
Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>
(cherry picked from commit c246828c4d59025bf4e1d5d9de5d9bc5517b3a7b)

---

 src/mesa/drivers/common/meta.h      |    4 ++--
 src/mesa/drivers/common/meta_blit.c |   13 ++++++++++++-
 2 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/src/mesa/drivers/common/meta.h b/src/mesa/drivers/common/meta.h
index 007f104..765f8df 100644
--- a/src/mesa/drivers/common/meta.h
+++ b/src/mesa/drivers/common/meta.h
@@ -270,7 +270,7 @@ struct blit_state
 struct fb_tex_blit_state
 {
    GLint baseLevelSave, maxLevelSave;
-   GLuint sampler, samplerSave;
+   GLuint sampler, samplerSave, stencilSamplingSave;
    GLuint tempTex;
 };
 
@@ -407,7 +407,7 @@ _mesa_meta_fb_tex_blit_begin(const struct gl_context *ctx,
                              struct fb_tex_blit_state *blit);
 
 extern void
-_mesa_meta_fb_tex_blit_end(const struct gl_context *ctx, GLenum target,
+_mesa_meta_fb_tex_blit_end(struct gl_context *ctx, GLenum target,
                            struct fb_tex_blit_state *blit);
 
 extern GLboolean
diff --git a/src/mesa/drivers/common/meta_blit.c b/src/mesa/drivers/common/meta_blit.c
index 753afff..a352a49 100644
--- a/src/mesa/drivers/common/meta_blit.c
+++ b/src/mesa/drivers/common/meta_blit.c
@@ -444,6 +444,7 @@ blitframebuffer_texture(struct gl_context *ctx,
 
    fb_tex_blit.baseLevelSave = texObj->BaseLevel;
    fb_tex_blit.maxLevelSave = texObj->MaxLevel;
+   fb_tex_blit.stencilSamplingSave = texObj->StencilSampling;
 
    if (glsl_version) {
       setup_glsl_blit_framebuffer(ctx, blit, rb, target);
@@ -574,7 +575,7 @@ _mesa_meta_fb_tex_blit_begin(const struct gl_context *ctx,
 }
 
 void
-_mesa_meta_fb_tex_blit_end(const struct gl_context *ctx, GLenum target,
+_mesa_meta_fb_tex_blit_end(struct gl_context *ctx, GLenum target,
                            struct fb_tex_blit_state *blit)
 {
    /* Restore texture object state, the texture binding will
@@ -583,6 +584,16 @@ _mesa_meta_fb_tex_blit_end(const struct gl_context *ctx, GLenum target,
    if (target != GL_TEXTURE_RECTANGLE_ARB) {
       _mesa_TexParameteri(target, GL_TEXTURE_BASE_LEVEL, blit->baseLevelSave);
       _mesa_TexParameteri(target, GL_TEXTURE_MAX_LEVEL, blit->maxLevelSave);
+
+      if (ctx->Extensions.ARB_stencil_texturing) {
+         const struct gl_texture_object *texObj =
+            _mesa_get_current_tex_object(ctx, target);
+
+         if (texObj->StencilSampling != blit->stencilSamplingSave)
+            _mesa_TexParameteri(target, GL_DEPTH_STENCIL_TEXTURE_MODE,
+                                blit->stencilSamplingSave ?
+                                   GL_STENCIL_INDEX : GL_DEPTH_COMPONENT);
+      }
    }
 
    _mesa_BindSampler(ctx->Texture.CurrentUnit, blit->samplerSave);