haiku: fix Mesa build

1. The hgl.c file is a read-only file versus read-write.
Ref: src/gallium/state_trackers/hgl/hgl.c

2.  I've included the Haiku-specific patches I used to get a successful
build of Mesa 19.1.7 on Haiku using the meson/ninja build procedure.
Shows "[764/764] linking target ... libswpipe.so" at build completion.

v2:
Remove autotools files (Eric)

v3:
Update the patch

Reported-by: Ken Mays <[email protected]>
Tested-by: Ken Mays <[email protected]>
CC: [email protected]
Reviewed-by: Alexander von Gluck IV <[email protected]>

1 files changed, 7 insertions, 25 deletions

diff --git a/src/gallium/targets/haiku-softpipe/GalliumContext.cpp b/src/gallium/targets/haiku-softpipe/GalliumContext.cpp
index 0356f65417c..d9be7904630 100644
--- a/src/gallium/targets/haiku-softpipe/GalliumContext.cpp
+++ b/src/gallium/targets/haiku-softpipe/GalliumContext.cpp
@@ -26,6 +26,7 @@
 #include "sw/hgl/hgl_sw_winsys.h"
 #include "util/u_atomic.h"
 #include "util/u_memory.h"
+#include "util/u_framebuffer.h"
 
 #include "target-helpers/inline_sw_helper.h"
 #include "target-helpers/inline_debug_helper.h"
@@ -332,36 +333,17 @@ GalliumContext::SwapBuffers(context_id contextID)
 		ERROR("%s: context not found\n", __func__);
 		return B_ERROR;
 	}
-
-	// TODO: Where did st_notify_swapbuffers go?
-	//st_notify_swapbuffers(context->draw->stfbi);
-
 	context->st->flush(context->st, ST_FLUSH_FRONT, NULL);
 
-	struct st_context *stContext = (struct st_context*)context->st;
-
-	unsigned nColorBuffers = stContext->state.framebuffer.nr_cbufs;
-	for (unsigned i = 0; i < nColorBuffers; i++) {
-		pipe_surface* surface = stContext->state.framebuffer.cbufs[i];
-		if (!surface) {
-			ERROR("%s: Color buffer %d invalid!\n", __func__, i);
-			continue;
-		}
-
-		TRACE("%s: Flushing color buffer #%d\n", __func__, i);
-
-		// We pass our destination bitmap to flush_fronbuffer which passes it
-		// to the private winsys display call.
-		fScreen->flush_frontbuffer(fScreen, surface->texture, 0, 0,
-			context->bitmap, NULL);
+	struct hgl_buffer* buffer = hgl_st_framebuffer(context->draw->stfbi);
+	pipe_surface* surface = buffer->surface;
+	if (!surface) {
+		ERROR("%s: Invalid drawable surface!\n", __func__);
+		return B_ERROR;
 	}
 
-	#if 0
-	// TODO... should we flush the z stencil buffer?
-	pipe_surface* zSurface = stContext->state.framebuffer.zsbuf;
-	fScreen->flush_frontbuffer(fScreen, zSurface->texture, 0, 0,
+	fScreen->flush_frontbuffer(fScreen, surface->texture, 0, 0,
 		context->bitmap, NULL);
-	#endif
 
 	return B_OK;
 }