mesa/i965: Refactor brw_is_front_buffer_{drawing,reading} to common code

There are multiple similar implementations of these functions, and a
later patch was going to add another.

v2: Move removing intel_framebuffer to a different patch.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>

src/mesa/drivers/dri/i965/brw_context.c

@@ -41,6 +41,7 @@
 #include "main/version.h"
 #include "main/vtxfmt.h"
 #include "main/texobj.h"
+#include "main/framebuffer.h"
 
 #include "vbo/vbo_context.h"
 
@@ -1298,7 +1299,7 @@ intel_prepare_render(struct brw_context *brw)
     * that will happen next will probably dirty the front buffer.  So
     * mark it as dirty here.
     */
-   if (brw_is_front_buffer_drawing(ctx->DrawBuffer))
+   if (_mesa_is_front_buffer_drawing(ctx->DrawBuffer))
       brw->front_buffer_dirty = true;
 }
 
@@ -1337,8 +1338,8 @@ intel_query_dri2_buffers(struct brw_context *brw,
    back_rb = intel_get_renderbuffer(fb, BUFFER_BACK_LEFT);
 
    memset(attachments, 0, sizeof(attachments));
-   if ((brw_is_front_buffer_drawing(fb) ||
-        brw_is_front_buffer_reading(fb) ||
+   if ((_mesa_is_front_buffer_drawing(fb) ||
+        _mesa_is_front_buffer_reading(fb) ||
         !back_rb) && front_rb) {
       /* If a fake front buffer is in use, then querying for
        * __DRI_BUFFER_FRONT_LEFT will cause the server to copy the image from
@@ -1452,7 +1453,7 @@ intel_process_dri2_buffer(struct brw_context *brw,
                                             drawable->w, drawable->h,
                                             buffer->pitch);
 
-   if (brw_is_front_buffer_drawing(fb) &&
+   if (_mesa_is_front_buffer_drawing(fb) &&
        (buffer->attachment == __DRI_BUFFER_FRONT_LEFT ||
         buffer->attachment == __DRI_BUFFER_FAKE_FRONT_LEFT) &&
        rb->Base.Base.NumSamples > 1) {
@@ -1510,7 +1511,7 @@ intel_update_image_buffer(struct brw_context *intel,
                                             buffer->width, buffer->height,
                                             buffer->pitch);
 
-   if (brw_is_front_buffer_drawing(fb) &&
+   if (_mesa_is_front_buffer_drawing(fb) &&
        buffer_type == __DRI_IMAGE_BUFFER_FRONT &&
        rb->Base.Base.NumSamples > 1) {
       intel_renderbuffer_upsample(intel, rb);
@@ -1538,8 +1539,8 @@ intel_update_image_buffers(struct brw_context *brw, __DRIdrawable *drawable)
    else
       return;
 
-   if (front_rb && (brw_is_front_buffer_drawing(fb) ||
-                    brw_is_front_buffer_reading(fb) || !back_rb)) {
+   if (front_rb && (_mesa_is_front_buffer_drawing(fb) ||
+                    _mesa_is_front_buffer_reading(fb) || !back_rb)) {
       buffer_mask |= __DRI_IMAGE_BUFFER_FRONT;
    }
 

src/mesa/drivers/dri/i965/brw_draw.c

@@ -33,6 +33,7 @@
 #include "main/enums.h"
 #include "main/macros.h"
 #include "main/transformfeedback.h"
+#include "main/framebuffer.h"
 #include "tnl/tnl.h"
 #include "vbo/vbo_context.h"
 #include "swrast/swrast.h"
@@ -364,7 +365,7 @@ brw_postdraw_set_buffers_need_resolve(struct brw_context *brw)
    struct intel_renderbuffer *stencil_irb = intel_get_renderbuffer(fb, BUFFER_STENCIL);
    struct gl_renderbuffer_attachment *depth_att = &fb->Attachment[BUFFER_DEPTH];
 
-   if (brw_is_front_buffer_drawing(fb))
+   if (_mesa_is_front_buffer_drawing(fb))
       front_irb = intel_get_renderbuffer(fb, BUFFER_FRONT_LEFT);
 
    if (front_irb)

src/mesa/drivers/dri/i965/intel_buffers.c

@@ -32,30 +32,10 @@
 #include "main/framebuffer.h"
 #include "main/renderbuffer.h"
 
-
-bool
-brw_is_front_buffer_reading(struct gl_framebuffer *fb)
-{
-   if (!fb || _mesa_is_user_fbo(fb))
-      return false;
-
-   return fb->_ColorReadBufferIndex == BUFFER_FRONT_LEFT;
-}
-
-bool
-brw_is_front_buffer_drawing(struct gl_framebuffer *fb)
-{
-   if (!fb || _mesa_is_user_fbo(fb))
-      return false;
-
-   return (fb->_NumColorDrawBuffers >= 1 &&
-           fb->_ColorDrawBufferIndexes[0] == BUFFER_FRONT_LEFT);
-}
-
 static void
 intelDrawBuffer(struct gl_context * ctx, GLenum mode)
 {
-   if (brw_is_front_buffer_drawing(ctx->DrawBuffer)) {
+   if (_mesa_is_front_buffer_drawing(ctx->DrawBuffer)) {
       struct brw_context *const brw = brw_context(ctx);
 
       /* If we might be front-buffer rendering on this buffer for the first
@@ -71,7 +51,7 @@ intelDrawBuffer(struct gl_context * ctx, GLenum mode)
 static void
 intelReadBuffer(struct gl_context * ctx, GLenum mode)
 {
-   if (brw_is_front_buffer_reading(ctx->ReadBuffer)) {
+   if (_mesa_is_front_buffer_reading(ctx->ReadBuffer)) {
       struct brw_context *const brw = brw_context(ctx);
 
       /* If we might be front-buffer reading on this buffer for the first

src/mesa/drivers/dri/i965/intel_buffers.h

@@ -32,7 +32,4 @@
 
 extern void intelInitBufferFuncs(struct dd_function_table *functions);
 
-bool brw_is_front_buffer_reading(struct gl_framebuffer *fb);
-bool brw_is_front_buffer_drawing(struct gl_framebuffer *fb);
-
 #endif /* INTEL_BUFFERS_H */

src/mesa/main/framebuffer.c

@@ -964,3 +964,22 @@ _mesa_print_framebuffer(const struct gl_framebuffer *fb)
       }
    }
 }
+
+bool
+_mesa_is_front_buffer_reading(const struct gl_framebuffer *fb)
+{
+   if (!fb || _mesa_is_user_fbo(fb))
+      return false;
+
+   return fb->_ColorReadBufferIndex == BUFFER_FRONT_LEFT;
+}
+
+bool
+_mesa_is_front_buffer_drawing(const struct gl_framebuffer *fb)
+{
+   if (!fb || _mesa_is_user_fbo(fb))
+      return false;
+
+   return (fb->_NumColorDrawBuffers >= 1 &&
+           fb->_ColorDrawBufferIndexes[0] == BUFFER_FRONT_LEFT);
+}

src/mesa/main/framebuffer.h

@@ -139,4 +139,10 @@ _mesa_get_read_renderbuffer_for_format(const struct gl_context *ctx,
 extern void
 _mesa_print_framebuffer(const struct gl_framebuffer *fb);
 
+extern bool
+_mesa_is_front_buffer_reading(const struct gl_framebuffer *fb);
+
+extern bool
+_mesa_is_front_buffer_drawing(const struct gl_framebuffer *fb);
+
 #endif /* FRAMEBUFFER_H */