From c4d54b62f5491dbec9930563209639f8fb7dcf2e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jos=C3=A9=20Fonseca?= <jfonseca@vmware.com>
Date: Fri, 9 Oct 2009 11:29:33 +0100
Subject: [PATCH] llvmpipe: Eliminate constant mapping/unmapping.

---
 src/gallium/drivers/llvmpipe/lp_context.h     |  3 --
 src/gallium/drivers/llvmpipe/lp_draw_arrays.c | 54 -------------------
 src/gallium/drivers/llvmpipe/lp_state_fs.c    | 20 +++++--
 3 files changed, 17 insertions(+), 60 deletions(-)

diff --git a/src/gallium/drivers/llvmpipe/lp_context.h b/src/gallium/drivers/llvmpipe/lp_context.h
index 852f7a1d05c..e34385bbae0 100644
--- a/src/gallium/drivers/llvmpipe/lp_context.h
+++ b/src/gallium/drivers/llvmpipe/lp_context.h
@@ -86,9 +86,6 @@ struct llvmpipe_context {
    /** Mapped vertex buffers */
    ubyte *mapped_vbuffer[PIPE_MAX_ATTRIBS];
    
-   /** Mapped constant buffers */
-   void *mapped_constants[PIPE_SHADER_TYPES];
-
    /** Vertex format */
    struct vertex_info vertex_info;
    struct vertex_info vertex_info_vbuf;
diff --git a/src/gallium/drivers/llvmpipe/lp_draw_arrays.c b/src/gallium/drivers/llvmpipe/lp_draw_arrays.c
index 2bffcdb3ba5..b879b5e755e 100644
--- a/src/gallium/drivers/llvmpipe/lp_draw_arrays.c
+++ b/src/gallium/drivers/llvmpipe/lp_draw_arrays.c
@@ -45,54 +45,6 @@
 
 
 
-static void
-llvmpipe_map_constant_buffers(struct llvmpipe_context *lp)
-{
-   struct pipe_screen *screen = lp->pipe.screen;
-   uint i, size;
-
-   for (i = 0; i < PIPE_SHADER_TYPES; i++) {
-      if (lp->constants[i].buffer && lp->constants[i].buffer->size)
-         lp->mapped_constants[i] = screen->buffer_map(screen, lp->constants[i].buffer,
-                                                      PIPE_BUFFER_USAGE_CPU_READ);
-   }
-
-   if (lp->constants[PIPE_SHADER_VERTEX].buffer)
-      size = lp->constants[PIPE_SHADER_VERTEX].buffer->size;
-   else
-      size = 0;
-
-   lp->jit_context.constants = lp->mapped_constants[PIPE_SHADER_FRAGMENT];
-
-   draw_set_mapped_constant_buffer(lp->draw,
-                                   lp->mapped_constants[PIPE_SHADER_VERTEX],
-                                   size);
-}
-
-
-static void
-llvmpipe_unmap_constant_buffers(struct llvmpipe_context *lp)
-{
-   struct pipe_screen *screen = lp->pipe.screen;
-   uint i;
-
-   /* really need to flush all prims since the vert/frag shaders const buffers
-    * are going away now.
-    */
-   draw_flush(lp->draw);
-
-   draw_set_mapped_constant_buffer(lp->draw, NULL, 0);
-
-   lp->jit_context.constants = NULL;
-
-   for (i = 0; i < 2; i++) {
-      if (lp->constants[i].buffer && lp->constants[i].buffer->size)
-         screen->buffer_unmap(screen, lp->constants[i].buffer);
-      lp->mapped_constants[i] = NULL;
-   }
-}
-
-
 boolean
 llvmpipe_draw_arrays(struct pipe_context *pipe, unsigned mode,
                      unsigned start, unsigned count)
@@ -123,8 +75,6 @@ llvmpipe_draw_range_elements(struct pipe_context *pipe,
    if (lp->dirty)
       llvmpipe_update_derived( lp );
 
-   llvmpipe_map_constant_buffers(lp);
-
    /*
     * Map vertex buffers
     */
@@ -160,10 +110,6 @@ llvmpipe_draw_range_elements(struct pipe_context *pipe,
       draw_set_mapped_element_buffer(draw, 0, NULL);
    }
 
-
-   /* Note: leave drawing surfaces mapped */
-   llvmpipe_unmap_constant_buffers(lp);
-   
    return TRUE;
 }
 
diff --git a/src/gallium/drivers/llvmpipe/lp_state_fs.c b/src/gallium/drivers/llvmpipe/lp_state_fs.c
index 2c8b383123c..59c7afc6f78 100644
--- a/src/gallium/drivers/llvmpipe/lp_state_fs.c
+++ b/src/gallium/drivers/llvmpipe/lp_state_fs.c
@@ -83,6 +83,7 @@
 #include "lp_bld_debug.h"
 #include "lp_screen.h"
 #include "lp_context.h"
+#include "lp_buffer.h"
 #include "lp_state.h"
 #include "lp_tex_sample.h"
 
@@ -670,16 +671,29 @@ llvmpipe_delete_fs_state(struct pipe_context *pipe, void *fs)
 void
 llvmpipe_set_constant_buffer(struct pipe_context *pipe,
                              uint shader, uint index,
-                             const struct pipe_constant_buffer *buf)
+                             const struct pipe_constant_buffer *constants)
 {
    struct llvmpipe_context *llvmpipe = llvmpipe_context(pipe);
+   struct pipe_buffer *buffer = constants ? constants->buffer : NULL;
+   unsigned size = buffer ? buffer->size : 0;
+   const void *data = buffer ? llvmpipe_buffer(buffer)->data : NULL;
 
    assert(shader < PIPE_SHADER_TYPES);
    assert(index == 0);
 
+   if(shader == PIPE_SHADER_VERTEX)
+      draw_flush(llvmpipe->draw);
+
    /* note: reference counting */
-   pipe_buffer_reference(&llvmpipe->constants[shader].buffer,
-			 buf ? buf->buffer : NULL);
+   pipe_buffer_reference(&llvmpipe->constants[shader].buffer, buffer);
+
+   if(shader == PIPE_SHADER_FRAGMENT) {
+      llvmpipe->jit_context.constants = data;
+   }
+
+   if(shader == PIPE_SHADER_VERTEX) {
+      draw_set_mapped_constant_buffer(llvmpipe->draw, data, size);
+   }
 
    llvmpipe->dirty |= LP_NEW_CONSTANTS;
 }