[Mesa-dev] [PATCH 2/6] meta: Add flag MESA_META_SELECT_FEEDBACK

[Chad Versace]

If this flag is set, then _mesa_meta_begin/end will save/restore the state of
GL_SELECT and GL_FEEDBACK render modes.

Intel's future buffer resolve meta-ops will require this, since buffer resolves
may occur when the GL_RENDER_MODE is GL_SELECT.

Signed-off-by: Chad Versace <c...@chad-versace.us>
---
 src/mesa/drivers/common/meta.c |   26 ++++++++++++++++++++++++++
 src/mesa/drivers/common/meta.h |    1 +
 2 files changed, 27 insertions(+), 0 deletions(-)

diff --git a/src/mesa/drivers/common/meta.c b/src/mesa/drivers/common/meta.c
index a9c7f9a..4add2c5 100644
--- a/src/mesa/drivers/common/meta.c
+++ b/src/mesa/drivers/common/meta.c
@@ -172,6 +172,11 @@ struct save_state
    struct gl_query_object *CondRenderQuery;
    GLenum CondRenderMode;
 
+   /** MESA_META_SELECT_FEEDBACK */
+   GLenum RenderMode;
+   struct gl_selection Select;
+   struct gl_feedback Feedback;
+
    /** Miscellaneous (always disabled) */
    GLboolean Lighting;
 };
@@ -608,6 +613,17 @@ _mesa_meta_begin(struct gl_context *ctx, GLbitfield state)
         _mesa_EndConditionalRender();
    }
 
+   if (state & MESA_META_SELECT_FEEDBACK) {
+      save->RenderMode = ctx->RenderMode;
+      if (ctx->RenderMode == GL_SELECT) {
+        save->Select = ctx->Select; /* struct copy */
+        _mesa_RenderMode(GL_RENDER);
+      } else if (ctx->RenderMode == GL_FEEDBACK) {
+        save->Feedback = ctx->Feedback; /* struct copy */
+        _mesa_RenderMode(GL_RENDER);
+      }
+   }
+
    /* misc */
    {
       save->Lighting = ctx->Light.Enabled;
@@ -893,6 +909,16 @@ _mesa_meta_end(struct gl_context *ctx)
                                      save->CondRenderMode);
    }
 
+   if (state & MESA_META_SELECT_FEEDBACK) {
+      if (save->RenderMode == GL_SELECT) {
+        _mesa_RenderMode(GL_SELECT);
+        ctx->Select = save->Select;
+      } else if (save->RenderMode == GL_FEEDBACK) {
+        _mesa_RenderMode(GL_FEEDBACK);
+        ctx->Feedback = save->Feedback;
+      }
+   }
+
    /* misc */
    if (save->Lighting) {
       _mesa_set_enable(ctx, GL_LIGHTING, GL_TRUE);
diff --git a/src/mesa/drivers/common/meta.h b/src/mesa/drivers/common/meta.h
index 7ec5683..e0435a8 100644
--- a/src/mesa/drivers/common/meta.h
+++ b/src/mesa/drivers/common/meta.h
@@ -54,6 +54,7 @@
 #define MESA_META_CLAMP_VERTEX_COLOR    0x10000
 #define MESA_META_CONDITIONAL_RENDER    0x20000
 #define MESA_META_CLIP                  0x40000
+#define MESA_META_SELECT_FEEDBACK       0x80000
 /**\}*/
 
 extern void
-- 
1.7.6.4

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