From f6d4e20d10d2316b70b73676e97b2c1e5cf7634a Mon Sep 17 00:00:00 2001 From: Brian Paul Date: Thu, 15 Oct 2015 12:33:00 -0600 Subject: [PATCH] vbo: reduce number of vertex buffer mappings for vertex attributes MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Whenever we got a glColor, glNormal, glTexCoord, etc. call outside a glBegin/End pair, we'd immediately map a vertex buffer to begin accumulating vertex data. In some cases, such as with display lists, this led to excessive vertex buffer mapping. For example, if we have a display list such as: glNewList(42, GL_COMPILE); glBegin(prim); glVertex2f(); ... glVertex2f(); glEnd(); glEndList(); Then did: glColor3f(); glCallList(42); We'd map a vertex buffer as soon as we saw glColor3f but we'd never actually write anything to it. Note that the vertex position data was put into a vertex buffer during display list compilation. With this change, we delay mapping the vertex buffer until we actually have a vertex to write to it (triggered by a glVertex() call). In the above case, we no longer map a vertex buffer when setting the color and calling the list. For drivers such as VMware's, reducing buffer mappings gives improved performance. Reviewed-by: Marek Olšák --- src/mesa/vbo/vbo_exec_api.c | 18 +++++++++++++----- 1 file changed, 13 insertions(+), 5 deletions(-) diff --git a/src/mesa/vbo/vbo_exec_api.c b/src/mesa/vbo/vbo_exec_api.c index 7ae08fe..789869a 100644 --- a/src/mesa/vbo/vbo_exec_api.c +++ b/src/mesa/vbo/vbo_exec_api.c @@ -446,10 +446,6 @@ do { \ \ assert(sz == 1 || sz == 2); \ \ - if (unlikely(!(ctx->Driver.NeedFlush & FLUSH_UPDATE_CURRENT))) { \ - vbo_exec_begin_vertices(ctx); \ - } \ - \ /* check if attribute size or type is changing */ \ if (unlikely(exec->vtx.active_sz[A] != N * sz) || \ unlikely(exec->vtx.attrtype[A] != T)) { \ @@ -470,6 +466,15 @@ do { \ /* This is a glVertex call */ \ GLuint i; \ \ + if (unlikely((ctx->Driver.NeedFlush & FLUSH_UPDATE_CURRENT) == 0)) { \ + vbo_exec_begin_vertices(ctx); \ + } \ + \ + if (unlikely(!exec->vtx.buffer_ptr)) { \ + vbo_exec_vtx_map(exec); \ + } \ + assert(exec->vtx.buffer_ptr); \ + \ /* copy 32-bit words */ \ for (i = 0; i < exec->vtx.vertex_size; i++) \ exec->vtx.buffer_ptr[i] = exec->vtx.vertex[i]; \ @@ -482,7 +487,10 @@ do { \ \ if (++exec->vtx.vert_count >= exec->vtx.max_vert) \ vbo_exec_vtx_wrap( exec ); \ - } \ + } else { \ + /* we now have accumulated per-vertex attributes */ \ + ctx->Driver.NeedFlush |= FLUSH_UPDATE_CURRENT; \ + } \ } while (0) #define ERROR(err) _mesa_error( ctx, err, __func__ ) -- 2.7.4