From 6125cbe983b267846afb8f1e487d378bdf7a189c Mon Sep 17 00:00:00 2001
From: =?utf8?q?Marek=20Ol=C5=A1=C3=A1k?= <maraeo@gmail.com>
Date: Sat, 25 Dec 2010 14:49:17 +0100
Subject: [PATCH] r300g: remove the buffer range checking

It's no longer needed because the upload buffer remains mapped while the CS
is being filled (openarena, ut2004 and others that this code was for do not
use VBOs by default).
---
 src/gallium/drivers/r300/r300_screen_buffer.c | 59 +------------------
 src/gallium/drivers/r300/r300_screen_buffer.h |  2 -
 2 files changed, 1 insertion(+), 60 deletions(-)

diff --git a/src/gallium/drivers/r300/r300_screen_buffer.c b/src/gallium/drivers/r300/r300_screen_buffer.c
index d9c491f1e60..d2cfaad8a57 100644
--- a/src/gallium/drivers/r300/r300_screen_buffer.c
+++ b/src/gallium/drivers/r300/r300_screen_buffer.c
@@ -163,49 +163,17 @@ r300_buffer_transfer_map( struct pipe_context *pipe,
     struct r300_winsys_screen *rws = r300screen->rws;
     struct r300_buffer *rbuf = r300_buffer(transfer->resource);
     uint8_t *map;
-    boolean flush = FALSE;
-    unsigned i;
 
     if (rbuf->user_buffer)
         return (uint8_t *) rbuf->user_buffer + transfer->box.x;
     if (rbuf->constant_buffer)
         return (uint8_t *) rbuf->constant_buffer + transfer->box.x;
 
-    /* check if the mapping is to a range we already flushed */
-    if (transfer->usage & PIPE_TRANSFER_DISCARD) {
-	for (i = 0; i < rbuf->num_ranges; i++) {
-	    if ((transfer->box.x >= rbuf->ranges[i].start) &&
-		(transfer->box.x < rbuf->ranges[i].end))
-		flush = TRUE;
-
-	    if (flush) {
-		/* unreference this hw buffer and allocate a new one */
-		rws->buffer_reference(rws, &rbuf->buf, NULL);
-
-		rbuf->num_ranges = 0;
-                rbuf->buf =
-                    r300screen->rws->buffer_create(r300screen->rws,
-                                                   rbuf->b.b.width0, 16,
-                                                   rbuf->b.b.bind,
-                                                   rbuf->b.b.usage,
-                                                   rbuf->domain);
-                rbuf->cs_buf =
-                    r300screen->rws->buffer_get_cs_handle(r300screen->rws,
-                                                          rbuf->buf);
-		break;
-	    }
-	}
-    }
-
     map = rws->buffer_map(rws, rbuf->buf, r300->cs, transfer->usage);
 
     if (map == NULL)
         return NULL;
 
-    /* map_buffer() returned a pointer to the beginning of the buffer,
-     * but transfers are expected to return a pointer to just the
-     * region specified in the box.
-     */
     return map + transfer->box.x;
 }
 
@@ -213,30 +181,7 @@ static void r300_buffer_transfer_flush_region( struct pipe_context *pipe,
 					       struct pipe_transfer *transfer,
 					       const struct pipe_box *box)
 {
-    struct r300_buffer *rbuf = r300_buffer(transfer->resource);
-    unsigned i;
-    unsigned offset = transfer->box.x + box->x;
-    unsigned length = box->width;
-
-    assert(box->x + box->width <= transfer->box.width);
-
-    if (rbuf->user_buffer)
-	return;
-    if (rbuf->constant_buffer)
-        return;
-
-    /* mark the range as used */
-    for(i = 0; i < rbuf->num_ranges; ++i) {
-	if(offset <= rbuf->ranges[i].end && rbuf->ranges[i].start <= (offset+box->width)) {
-	    rbuf->ranges[i].start = MIN2(rbuf->ranges[i].start, offset);
-	    rbuf->ranges[i].end   = MAX2(rbuf->ranges[i].end, (offset+length));
-	    return;
-	}
-    }
-
-    rbuf->ranges[rbuf->num_ranges].start = offset;
-    rbuf->ranges[rbuf->num_ranges].end = offset+length;
-    rbuf->num_ranges++;
+    /* no-op */
 }
 
 static void r300_buffer_transfer_unmap( struct pipe_context *pipe,
@@ -308,7 +253,6 @@ struct pipe_resource *r300_buffer_create(struct pipe_screen *screen,
     pipe_reference_init(&rbuf->b.b.reference, 1);
     rbuf->b.b.screen = screen;
     rbuf->domain = R300_DOMAIN_GTT;
-    rbuf->num_ranges = 0;
     rbuf->buf = NULL;
     rbuf->constant_buffer = NULL;
     rbuf->user_buffer = NULL;
@@ -360,7 +304,6 @@ struct pipe_resource *r300_user_buffer_create(struct pipe_screen *screen,
     rbuf->b.b.array_size = 1;
     rbuf->b.b.flags = 0;
     rbuf->domain = R300_DOMAIN_GTT;
-    rbuf->num_ranges = 0;
     rbuf->buf = NULL;
     rbuf->constant_buffer = NULL;
     rbuf->user_buffer = ptr;
diff --git a/src/gallium/drivers/r300/r300_screen_buffer.h b/src/gallium/drivers/r300/r300_screen_buffer.h
index fb0033c0f59..70ffcf506c6 100644
--- a/src/gallium/drivers/r300/r300_screen_buffer.h
+++ b/src/gallium/drivers/r300/r300_screen_buffer.h
@@ -57,8 +57,6 @@ struct r300_buffer
 
     uint8_t *user_buffer;
     uint8_t *constant_buffer;
-    struct r300_buffer_range ranges[R300_BUFFER_MAX_RANGES];
-    unsigned num_ranges;
 };
 
 /* Functions. */
-- 
2.30.2