From 6236c477990d67499f494b3c95844217fbd9a3dd Mon Sep 17 00:00:00 2001
From: Laura Ekstrand <laura@jlekstrand.net>
Date: Thu, 5 Feb 2015 13:24:43 -0800
Subject: [PATCH] main: Fake entry point for glClearNamedFramebufferiv.
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Mesa's ClearBuffer framework is very complicated and thoroughly married to the
object binding model.  Moreover, the OpenGL spec for ClearBuffer is also very
complicated.  At some point, we should implement buffer clearing for arbitrary
framebuffer objects, but for now, we will just wrap ClearBuffer.

Reviewed-by: Fredrik Höglund <fredrik@kde.org>
Signed-off-by: Fredrik Höglund <fredrik@kde.org>
---
 .../glapi/gen/ARB_direct_state_access.xml     |  7 +++++++
 src/mesa/main/clear.c                         | 20 +++++++++++++++++++
 src/mesa/main/clear.h                         |  4 ++++
 src/mesa/main/tests/dispatch_sanity.cpp       |  1 +
 4 files changed, 32 insertions(+)

diff --git a/src/mapi/glapi/gen/ARB_direct_state_access.xml b/src/mapi/glapi/gen/ARB_direct_state_access.xml
index de7742088e1..c793c9e9c70 100644
--- a/src/mapi/glapi/gen/ARB_direct_state_access.xml
+++ b/src/mapi/glapi/gen/ARB_direct_state_access.xml
@@ -197,6 +197,13 @@
       <param name="height" type="GLsizei" />
    </function>
 
+   <function name="ClearNamedFramebufferiv" offset="assign">
+      <param name="framebuffer" type="GLuint" />
+      <param name="buffer" type="GLenum" />
+      <param name="drawbuffer" type="GLint" />
+      <param name="value" type="const GLint *" />
+   </function>
+
    <function name="BlitNamedFramebuffer" offset="assign">
       <param name="readFramebuffer" type="GLuint" />
       <param name="drawFramebuffer" type="GLuint" />
diff --git a/src/mesa/main/clear.c b/src/mesa/main/clear.c
index 8d707bc34a1..4e029cf258f 100644
--- a/src/mesa/main/clear.c
+++ b/src/mesa/main/clear.c
@@ -34,6 +34,8 @@
 #include "clear.h"
 #include "context.h"
 #include "enums.h"
+#include "fbobject.h"
+#include "get.h"
 #include "macros.h"
 #include "mtypes.h"
 #include "state.h"
@@ -399,6 +401,24 @@ _mesa_ClearBufferiv(GLenum buffer, GLint drawbuffer, const GLint *value)
 }
 
 
+/**
+ * The ClearBuffer framework is so complicated and so riddled with the
+ * assumption that the framebuffer is bound that, for now, we will just fake
+ * direct state access clearing for the user.
+ */
+void GLAPIENTRY
+_mesa_ClearNamedFramebufferiv(GLuint framebuffer, GLenum buffer,
+                              GLint drawbuffer, const GLint *value)
+{
+   GLint oldfb;
+
+   _mesa_GetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, &oldfb);
+   _mesa_BindFramebuffer(GL_DRAW_FRAMEBUFFER, framebuffer);
+   _mesa_ClearBufferiv(buffer, drawbuffer, value);
+   _mesa_BindFramebuffer(GL_DRAW_FRAMEBUFFER, (GLuint) oldfb);
+}
+
+
 /**
  * New in GL 3.0
  * Clear unsigned integer color buffer (not depth, not stencil).
diff --git a/src/mesa/main/clear.h b/src/mesa/main/clear.h
index 96ce47b929e..d0b61335356 100644
--- a/src/mesa/main/clear.h
+++ b/src/mesa/main/clear.h
@@ -51,6 +51,10 @@ _mesa_Clear( GLbitfield mask );
 extern void GLAPIENTRY
 _mesa_ClearBufferiv(GLenum buffer, GLint drawbuffer, const GLint *value);
 
+extern void GLAPIENTRY
+_mesa_ClearNamedFramebufferiv(GLuint framebuffer, GLenum buffer,
+                              GLint drawbuffer, const GLint *value);
+
 extern void GLAPIENTRY
 _mesa_ClearBufferuiv(GLenum buffer, GLint drawbuffer, const GLuint *value);
 
diff --git a/src/mesa/main/tests/dispatch_sanity.cpp b/src/mesa/main/tests/dispatch_sanity.cpp
index e375260ff1f..149c8b456b2 100644
--- a/src/mesa/main/tests/dispatch_sanity.cpp
+++ b/src/mesa/main/tests/dispatch_sanity.cpp
@@ -986,6 +986,7 @@ const struct function gl_core_functions_possible[] = {
    { "glNamedFramebufferTextureLayer", 45, -1 },
    { "glInvalidateNamedFramebufferSubData", 45, -1 },
    { "glInvalidateNamedFramebufferData", 45, -1 },
+   { "glClearNamedFramebufferiv", 45, -1 },
    { "glBlitNamedFramebuffer", 45, -1 },
    { "glCheckNamedFramebufferStatus", 45, -1 },
    { "glGetNamedFramebufferAttachmentParameteriv", 45, -1 },
-- 
2.30.2