main: Fake entry point for glClearNamedFramebufferfi.

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>

src/mapi/glapi/gen/ARB_direct_state_access.xml

@@ -218,6 +218,13 @@
       <param name="value" type="const GLfloat *" />
    </function>
 
+   <function name="ClearNamedFramebufferfi" offset="assign">
+      <param name="framebuffer" type="GLuint" />
+      <param name="buffer" type="GLenum" />
+      <param name="depth" type="GLfloat" />
+      <param name="stencil" type="GLint" />
+   </function>
+
    <function name="BlitNamedFramebuffer" offset="assign">
       <param name="readFramebuffer" type="GLuint" />
       <param name="drawFramebuffer" type="GLuint" />

src/mesa/main/clear.c

@@ -682,3 +682,21 @@ _mesa_ClearBufferfi(GLenum buffer, GLint drawbuffer,
       ctx->Stencil.Clear = clearStencilSave;
    }
 }
+
+
+/**
+ * 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_ClearNamedFramebufferfi(GLuint framebuffer, GLenum buffer,
+                              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_BindFramebuffer(GL_DRAW_FRAMEBUFFER, (GLuint) oldfb);
+}

src/mesa/main/clear.h

@@ -73,4 +73,8 @@ extern void GLAPIENTRY
 _mesa_ClearBufferfi(GLenum buffer, GLint drawbuffer,
                     GLfloat depth, GLint stencil);
 
+extern void GLAPIENTRY
+_mesa_ClearNamedFramebufferfi(GLuint framebuffer, GLenum buffer,
+                              GLfloat depth, GLint stencil);
+
 #endif

src/mesa/main/tests/dispatch_sanity.cpp

@@ -989,6 +989,7 @@ const struct function gl_core_functions_possible[] = {
    { "glClearNamedFramebufferiv", 45, -1 },
    { "glClearNamedFramebufferuiv", 45, -1 },
    { "glClearNamedFramebufferfv", 45, -1 },
+   { "glClearNamedFramebufferfi", 45, -1 },
    { "glBlitNamedFramebuffer", 45, -1 },
    { "glCheckNamedFramebufferStatus", 45, -1 },
    { "glGetNamedFramebufferAttachmentParameteriv", 45, -1 },