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diff --git a/src/mesa/state_tracker/acc2.c b/src/mesa/state_tracker/acc2.c
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+/**************************************************************************
+ *
+ * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+ * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+
+ /*
+ * Authors:
+ * Brian Paul
+ */
+
+#include "main/imports.h"
+#include "main/image.h"
+#include "main/macros.h"
+
+#include "st_context.h"
+#include "st_cb_accum.h"
+#include "st_cb_fbo.h"
+#include "st_draw.h"
+#include "st_format.h"
+#include "pipe/p_context.h"
+#include "pipe/p_defines.h"
+#include "pipe/p_inlines.h"
+#include "util/p_tile.h"
+
+
+#define UNCLAMPED_FLOAT_TO_SHORT(us, f) \
+ us = ( (short) ( CLAMP((f), -1.0, 1.0) * 32767.0F) )
+
+
+/**
+ * For hardware that supports deep color buffers, we could accelerate
+ * most/all the accum operations with blending/texturing.
+ * For now, just use the get/put_tile() functions and do things in software.
+ */
+
+
+static void
+acc_get_tile_rgba(struct pipe_context *pipe, struct pipe_surface *acc_ps,
+ uint x, uint y, uint w, uint h, float *p)
+{
+ const enum pipe_format f = acc_ps->format;
+ const int cpp = acc_ps->cpp;
+
+ acc_ps->format = PIPE_FORMAT_R16G16B16A16_SNORM;
+ acc_ps->cpp = 8;
+
+ pipe_get_tile_rgba(pipe, acc_ps, x, y, w, h, p);
+
+ acc_ps->format = f;
+ acc_ps->cpp = cpp;
+}
+
+
+static void
+acc_put_tile_rgba(struct pipe_context *pipe, struct pipe_surface *acc_ps,
+ uint x, uint y, uint w, uint h, const float *p)
+{
+ enum pipe_format f = acc_ps->format;
+ const int cpp = acc_ps->cpp;
+
+ acc_ps->format = PIPE_FORMAT_R16G16B16A16_SNORM;
+ acc_ps->cpp = 8;
+
+ pipe_put_tile_rgba(pipe, acc_ps, x, y, w, h, p);
+
+ acc_ps->format = f;
+ acc_ps->cpp = cpp;
+}
+
+
+
+void
+st_clear_accum_buffer(GLcontext *ctx, struct gl_renderbuffer *rb)
+{
+ struct pipe_context *pipe = ctx->st->pipe;
+ struct st_renderbuffer *acc_strb = st_renderbuffer(rb);
+ struct pipe_surface *acc_ps = acc_strb->surface;
+ const GLint xpos = ctx->DrawBuffer->_Xmin;
+ const GLint ypos = ctx->DrawBuffer->_Ymin;
+ const GLint width = ctx->DrawBuffer->_Xmax - xpos;
+ const GLint height = ctx->DrawBuffer->_Ymax - ypos;
+ const GLfloat r = ctx->Accum.ClearColor[0];
+ const GLfloat g = ctx->Accum.ClearColor[1];
+ const GLfloat b = ctx->Accum.ClearColor[2];
+ const GLfloat a = ctx->Accum.ClearColor[3];
+ GLfloat *accBuf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
+ int i;
+
+#if 1
+ GLvoid *map;
+
+ map = pipe_surface_map(acc_ps);
+ switch (acc_strb->format) {
+ case PIPE_FORMAT_R16G16B16A16_SNORM:
+ {
+ GLshort r = FLOAT_TO_SHORT(ctx->Accum.ClearColor[0]);
+ GLshort g = FLOAT_TO_SHORT(ctx->Accum.ClearColor[1]);
+ GLshort b = FLOAT_TO_SHORT(ctx->Accum.ClearColor[2]);
+ GLshort a = FLOAT_TO_SHORT(ctx->Accum.ClearColor[3]);
+ int i, j;
+ for (i = 0; i < height; i++) {
+ GLshort *dst = ((GLshort *) map
+ + ((ypos + i) * acc_ps->pitch + xpos) * 4);
+ for (j = 0; j < width; j++) {
+ dst[0] = r;
+ dst[1] = g;
+ dst[2] = b;
+ dst[3] = a;
+ dst += 4;
+ }
+ }
+ }
+ break;
+ default:
+ _mesa_problem(ctx, "unexpected format in st_clear_accum_buffer()");
+ }
+
+ pipe_surface_unmap(acc_ps);
+
+#else
+ for (i = 0; i < width * height; i++) {
+ accBuf[i*4+0] = r;
+ accBuf[i*4+1] = g;
+ accBuf[i*4+2] = b;
+ accBuf[i*4+3] = a;
+ }
+
+ acc_put_tile_rgba(pipe, acc_ps, xpos, ypos, width, height, accBuf);
+#endif
+}
+
+
+/** For ADD/MULT */
+static void
+accum_mad(struct pipe_context *pipe, GLfloat scale, GLfloat bias,
+ GLint xpos, GLint ypos, GLint width, GLint height,
+ struct pipe_surface *acc_ps)
+{
+ GLfloat *accBuf;
+ GLint i;
+
+ accBuf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
+
+ pipe_get_tile_rgba(pipe, acc_ps, xpos, ypos, width, height, accBuf);
+
+ for (i = 0; i < 4 * width * height; i++) {
+ accBuf[i] = accBuf[i] * scale + bias;
+ }
+
+ pipe_put_tile_rgba(pipe, acc_ps, xpos, ypos, width, height, accBuf);
+
+ free(accBuf);
+}
+
+
+static void
+accum_accum(struct pipe_context *pipe, GLfloat value,
+ GLint xpos, GLint ypos, GLint width, GLint height,
+ struct pipe_surface *acc_ps,
+ struct pipe_surface *color_ps)
+{
+ GLfloat *colorBuf, *accBuf;
+ GLint i;
+
+ colorBuf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
+ accBuf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
+
+ pipe_get_tile_rgba(pipe, color_ps, xpos, ypos, width, height, colorBuf);
+ acc_get_tile_rgba(pipe, acc_ps, xpos, ypos, width, height, accBuf);
+
+ for (i = 0; i < 4 * width * height; i++) {
+ accBuf[i] = accBuf[i] + colorBuf[i] * value;
+ }
+
+ acc_put_tile_rgba(pipe, acc_ps, xpos, ypos, width, height, accBuf);
+
+ free(colorBuf);
+ free(accBuf);
+}
+
+
+static void
+accum_load(struct pipe_context *pipe, GLfloat value,
+ GLint xpos, GLint ypos, GLint width, GLint height,
+ struct pipe_surface *acc_ps,
+ struct pipe_surface *color_ps)
+{
+ GLfloat *buf;
+ GLint i;
+
+ buf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
+
+ pipe_get_tile_rgba(pipe, color_ps, xpos, ypos, width, height, buf);
+
+ for (i = 0; i < 4 * width * height; i++) {
+ buf[i] = buf[i] * value;
+ }
+
+ acc_put_tile_rgba(pipe, acc_ps, xpos, ypos, width, height, buf);
+
+ free(buf);
+}
+
+
+static void
+accum_return(GLcontext *ctx, GLfloat value,
+ GLint xpos, GLint ypos, GLint width, GLint height,
+ struct pipe_surface *acc_ps,
+ struct pipe_surface *color_ps)
+{
+ struct pipe_context *pipe = ctx->st->pipe;
+ const GLubyte *colormask = ctx->Color.ColorMask;
+ GLfloat *abuf, *cbuf = NULL;
+ GLint i, ch;
+
+ abuf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
+
+ acc_get_tile_rgba(pipe, acc_ps, xpos, ypos, width, height, abuf);
+
+ if (!colormask[0] || !colormask[1] || !colormask[2] || !colormask[3]) {
+ cbuf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
+ pipe_get_tile_rgba(pipe, color_ps, xpos, ypos, width, height, cbuf);
+ }
+
+ for (i = 0; i < width * height; i++) {
+ for (ch = 0; ch < 4; ch++) {
+ if (colormask[ch]) {
+ GLfloat val = abuf[i * 4 + ch] * value;
+ abuf[i * 4 + ch] = CLAMP(val, 0.0, 1.0);
+ }
+ else {
+ abuf[i * 4 + ch] = cbuf[i * 4 + ch];
+ }
+ }
+ }
+
+ pipe_put_tile_rgba(pipe, color_ps, xpos, ypos, width, height, abuf);
+
+ free(abuf);
+ if (cbuf)
+ free(cbuf);
+}
+
+
+static void
+st_Accum(GLcontext *ctx, GLenum op, GLfloat value)
+{
+ struct st_context *st = ctx->st;
+ struct pipe_context *pipe = st->pipe;
+ struct st_renderbuffer *acc_strb
+ = st_renderbuffer(ctx->DrawBuffer->Attachment[BUFFER_ACCUM].Renderbuffer);
+ struct st_renderbuffer *color_strb
+ = st_renderbuffer(ctx->ReadBuffer->_ColorReadBuffer);
+ struct pipe_surface *acc_ps = acc_strb->surface;
+ struct pipe_surface *color_ps = color_strb->surface;
+
+ const GLint xpos = ctx->DrawBuffer->_Xmin;
+ const GLint ypos = ctx->DrawBuffer->_Ymin;
+ const GLint width = ctx->DrawBuffer->_Xmax - xpos;
+ const GLint height = ctx->DrawBuffer->_Ymax - ypos;
+
+ /* make sure color bufs aren't cached */
+ pipe->flush(pipe, PIPE_FLUSH_RENDER_CACHE, NULL);
+
+ switch (op) {
+ case GL_ADD:
+ if (value != 0.0F) {
+ accum_mad(pipe, 1.0, value, xpos, ypos, width, height, acc_ps);
+ }
+ break;
+ case GL_MULT:
+ if (value != 1.0F) {
+ accum_mad(pipe, value, 0.0, xpos, ypos, width, height, acc_ps);
+ }
+ break;
+ case GL_ACCUM:
+ if (value != 0.0F) {
+ accum_accum(pipe, value, xpos, ypos, width, height, acc_ps, color_ps);
+ }
+ break;
+ case GL_LOAD:
+ accum_load(pipe, value, xpos, ypos, width, height, acc_ps, color_ps);
+ break;
+ case GL_RETURN:
+ accum_return(ctx, value, xpos, ypos, width, height, acc_ps, color_ps);
+ break;
+ default:
+ assert(0);
+ }
+}
+
+
+
+void st_init_accum_functions(struct dd_function_table *functions)
+{
+ functions->Accum = st_Accum;
+}
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