mesa: add drawbuffer argument to ClearNamedFramebufferfi

This was fixed in revision 47 of the ARB_dsa spec in Oct 22, 2015. Since
it's horrible to have differing APIs across library versions, we should
attempt to minimize the impact by backporting it as far as possible and
hope no one notices.

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
Cc: "11.2 12.0" <mesa-stable@lists.freedesktop.org>

src/mapi/glapi/gen/ARB_direct_state_access.xml

@@ -242,6 +242,7 @@
    <function name="ClearNamedFramebufferfi">
       <param name="framebuffer" type="GLuint" />
       <param name="buffer" type="GLenum" />
+      <param name="drawbuffer" type="GLint" />
       <param name="depth" type="GLfloat" />
       <param name="stencil" type="GLint" />
    </function>

src/mesa/main/clear.c

@@ -646,12 +646,12 @@ _mesa_ClearBufferfi(GLenum buffer, GLint drawbuffer,
  */
 void GLAPIENTRY
 _mesa_ClearNamedFramebufferfi(GLuint framebuffer, GLenum buffer,
-                              GLfloat depth, GLint stencil)
+                              GLint drawbuffer, GLfloat depth, GLint stencil)
 {
    GLint oldfb;
 
    _mesa_GetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, &oldfb);
    _mesa_BindFramebuffer(GL_DRAW_FRAMEBUFFER, framebuffer);
-   _mesa_ClearBufferfi(buffer, 0, depth, stencil);
+   _mesa_ClearBufferfi(buffer, drawbuffer, depth, stencil);
    _mesa_BindFramebuffer(GL_DRAW_FRAMEBUFFER, (GLuint) oldfb);
 }

src/mesa/main/clear.h

@@ -75,6 +75,6 @@ _mesa_ClearBufferfi(GLenum buffer, GLint drawbuffer,
 
 extern void GLAPIENTRY
 _mesa_ClearNamedFramebufferfi(GLuint framebuffer, GLenum buffer,
-                              GLfloat depth, GLint stencil);
+                              GLint drawbuffer, GLfloat depth, GLint stencil);
 
 #endif