gallium/auxiliary/indices: add u_primconvert

A convenient front end to indices generate/translate code, for emulating
primitives which are not supported natively by the driver.

This handles saving/restoring index buffer state, etc.

Signed-off-by: Rob Clark <robclark@freedesktop.org>
Reviewed-by: Brian Paul <brianp@vmware.com>

3 files changed, 227 insertions, 0 deletions

diff --git a/src/gallium/auxiliary/Makefile.sources b/src/gallium/auxiliary/Makefile.sources
index acbcef7e2ed..c89cbddd0dc 100644
--- a/src/gallium/auxiliary/Makefile.sources
+++ b/src/gallium/auxiliary/Makefile.sources
@@ -43,6 +43,7 @@ C_SOURCES := \
 	hud/hud_cpu.c \
 	hud/hud_fps.c \
         hud/hud_driver_query.c \
+	indices/u_primconvert.c \
 	os/os_misc.c \
 	os/os_process.c \
 	os/os_time.c \
diff --git a/src/gallium/auxiliary/indices/u_primconvert.c b/src/gallium/auxiliary/indices/u_primconvert.c
new file mode 100644
index 00000000000..14da7a68e3e
--- /dev/null
+++ b/src/gallium/auxiliary/indices/u_primconvert.c
@@ -0,0 +1,181 @@
+/*
+ * Copyright (C) 2013 Rob Clark <robclark@freedesktop.org>
+ *
+ * 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, sublicense,
+ * 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 NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS 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:
+ *    Rob Clark <robclark@freedesktop.org>
+ */
+
+/**
+ * This module converts provides a more convenient front-end to u_indices,
+ * etc, utils to convert primitive types supported not supported by the
+ * hardware.  It handles binding new index buffer state, and restoring
+ * previous state after.  To use, put something like this at the front of
+ * drivers pipe->draw_vbo():
+ *
+ *    // emulate unsupported primitives:
+ *    if (info->mode needs emulating) {
+ *       util_primconvert_save_index_buffer(ctx->primconvert, &ctx->indexbuf);
+ *       util_primconvert_save_rasterizer_state(ctx->primconvert, ctx->rasterizer);
+ *       util_primconvert_draw_vbo(ctx->primconvert, info);
+ *       return;
+ *    }
+ *
+ */
+
+#include "pipe/p_state.h"
+#include "util/u_draw.h"
+#include "util/u_inlines.h"
+#include "util/u_memory.h"
+
+#include "indices/u_indices.h"
+#include "indices/u_primconvert.h"
+
+struct primconvert_context
+{
+   struct pipe_context *pipe;
+   struct pipe_index_buffer saved_ib;
+   uint32_t primtypes_mask;
+   unsigned api_pv;
+   // TODO we could cache/recycle the indexbuf created to translate prims..
+};
+
+
+struct primconvert_context *
+util_primconvert_create(struct pipe_context *pipe, uint32_t primtypes_mask)
+{
+   struct primconvert_context *pc = CALLOC_STRUCT(primconvert_context);
+   if (!pc)
+      return NULL;
+   pc->pipe = pipe;
+   pc->primtypes_mask = primtypes_mask;
+   return pc;
+}
+
+void
+util_primconvert_destroy(struct primconvert_context *pc)
+{
+   util_primconvert_save_index_buffer(pc, NULL);
+   free(pc);
+}
+
+void
+util_primconvert_save_index_buffer(struct primconvert_context *pc,
+                                   const struct pipe_index_buffer *ib)
+{
+   if (ib) {
+      pipe_resource_reference(&pc->saved_ib.buffer, ib->buffer);
+      pc->saved_ib.index_size = ib->index_size;
+      pc->saved_ib.offset = ib->offset;
+      pc->saved_ib.user_buffer = ib->user_buffer;
+   }
+   else {
+      pipe_resource_reference(&pc->saved_ib.buffer, NULL);
+   }
+}
+
+void
+util_primconvert_save_rasterizer_state(struct primconvert_context *pc,
+                                       const struct pipe_rasterizer_state
+                                       *rast)
+{
+   /* if we actually translated the provoking vertex for the buffer,
+    * we would actually need to save/restore rasterizer state.  As
+    * it is, we just need to make note of the pv.
+    */
+   pc->api_pv = (rast->flatshade
+                 && !rast->flatshade_first) ? PV_LAST : PV_FIRST;
+}
+
+void
+util_primconvert_draw_vbo(struct primconvert_context *pc,
+                          const struct pipe_draw_info *info)
+{
+   struct pipe_index_buffer *ib = &pc->saved_ib;
+   struct pipe_index_buffer new_ib;
+   struct pipe_draw_info new_info;
+   struct pipe_transfer *src_transfer = NULL, *dst_transfer = NULL;
+   u_translate_func trans_func;
+   u_generate_func gen_func;
+   const void *src;
+   void *dst;
+
+   memset(&new_ib, 0, sizeof(new_ib));
+   util_draw_init_info(&new_info);
+   new_info.indexed = true;
+
+   if (info->indexed) {
+      u_index_translator(pc->primtypes_mask,
+                         info->mode, pc->saved_ib.index_size, info->count,
+                         pc->api_pv, pc->api_pv,
+                         &new_info.mode, &new_ib.index_size, &new_info.count,
+                         &trans_func);
+      src = ib->user_buffer;
+      if (!src) {
+         src = pipe_buffer_map(pc->pipe, ib->buffer,
+                               PIPE_TRANSFER_READ, &src_transfer);
+      }
+   }
+   else {
+      u_index_generator(pc->primtypes_mask,
+                        info->mode, info->start, info->count,
+                        pc->api_pv, pc->api_pv,
+                        &new_info.mode, &new_ib.index_size, &new_info.count,
+                        &gen_func);
+   }
+
+
+   new_ib.buffer = pipe_buffer_create(pc->pipe->screen,
+                                      PIPE_BIND_INDEX_BUFFER,
+                                      PIPE_USAGE_IMMUTABLE,
+                                      new_ib.index_size * new_info.count);
+   dst =
+      pipe_buffer_map(pc->pipe, new_ib.buffer, PIPE_TRANSFER_WRITE,
+                      &dst_transfer);
+
+   if (info->indexed) {
+      new_info.min_index = 0;
+      new_info.max_index = ~0;
+      trans_func(src, info->start, new_info.count, dst);
+   }
+   else {
+      new_info.min_index = info->start;
+      new_info.max_index = info->start + new_info.count;
+      gen_func(info->start, new_info.count, dst);
+   }
+
+   if (src_transfer)
+      pipe_buffer_unmap(pc->pipe, src_transfer);
+
+   if (dst_transfer)
+      pipe_buffer_unmap(pc->pipe, dst_transfer);
+
+   /* bind new index buffer: */
+   pc->pipe->set_index_buffer(pc->pipe, &new_ib);
+
+   /* to the translated draw: */
+   pc->pipe->draw_vbo(pc->pipe, &new_info);
+
+   /* and then restore saved ib: */
+   pc->pipe->set_index_buffer(pc->pipe, ib);
+
+   pipe_resource_reference(&new_ib.buffer, NULL);
+}
diff --git a/src/gallium/auxiliary/indices/u_primconvert.h b/src/gallium/auxiliary/indices/u_primconvert.h
new file mode 100644
index 00000000000..73ffea0ca29
--- /dev/null
+++ b/src/gallium/auxiliary/indices/u_primconvert.h
@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) 2013 Rob Clark <robclark@freedesktop.org>
+ *
+ * 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, sublicense,
+ * 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 NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS 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:
+ *    Rob Clark <robclark@freedesktop.org>
+ */
+
+#ifndef U_PRIMCONVERT_H_
+#define U_PRIMCONVERT_H_
+
+#include "pipe/p_state.h"
+
+struct primconvert_context;
+
+struct primconvert_context *util_primconvert_create(struct pipe_context *pipe,
+                                                    uint32_t primtypes_mask);
+void util_primconvert_destroy(struct primconvert_context *pc);
+void util_primconvert_save_index_buffer(struct primconvert_context *pc,
+                                        const struct pipe_index_buffer *ib);
+void util_primconvert_save_rasterizer_state(struct primconvert_context *pc,
+                                            const struct pipe_rasterizer_state
+                                            *rast);
+void util_primconvert_draw_vbo(struct primconvert_context *pc,
+                               const struct pipe_draw_info *info);
+
+#endif /* U_PRIMCONVERT_H_ */