src/gallium/drivers/llvmpipe/lp_state_rasterizer.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 #include "pipe/p_defines.h"
  29 #include "util/u_memory.h"
  30 #include "lp_context.h"
  31 #include "lp_state.h"
  32 #include "lp_setup.h"
  33 #include "draw/draw_context.h"
  34
  35 struct lp_rast_state {
  36    struct pipe_rasterizer_state lp_state;
  37    struct pipe_rasterizer_state draw_state;
  38 };
  39
  40 /* State which might be handled in either the draw module or locally.
  41  * This function is used to turn that state off in one of the two
  42  * places.
  43  */
  44 static void
  45 clear_flags(struct pipe_rasterizer_state *rast)
  46 {
  47    rast->light_twoside = 0;
  48    rast->offset_tri = 0;
  49 }
  50
  51
  52
  53 static void *
  54 llvmpipe_create_rasterizer_state(struct pipe_context *pipe,
  55                                  const struct pipe_rasterizer_state *rast)
  56 {
  57    boolean need_pipeline;
  58
  59    /* Partition rasterizer state into what we want the draw module to
  60     * handle, and what we'll look after ourselves.
  61     */
  62    struct lp_rast_state *state = MALLOC_STRUCT(lp_rast_state);
  63    if (state == NULL)
  64       return NULL;
  65
  66    memcpy(&state->draw_state, rast, sizeof *rast);
  67    memcpy(&state->lp_state, rast, sizeof *rast);
  68
  69    /* We rely on draw module to do unfilled polyons, AA lines and
  70     * points and stipple.
  71     *
  72     * Over time, reduce this list of conditions, and expand the list
  73     * of flags which get cleared in clear_flags().
  74     */
  75    need_pipeline = (rast->fill_front != PIPE_POLYGON_MODE_FILL ||
  76                     rast->fill_back != PIPE_POLYGON_MODE_FILL ||
  77                     rast->point_smooth ||
  78                     rast->line_smooth ||
  79                     rast->line_stipple_enable ||
  80                     rast->poly_stipple_enable);
  81
  82    /* If not using the pipeline, clear out the flags which we can
  83     * handle ourselves.  If we *are* using the pipeline, do everything
  84     * on the pipeline and clear those flags on our internal copy of
  85     * the state.
  86     */
  87    if (need_pipeline)
  88       clear_flags(&state->lp_state);
  89    else
  90       clear_flags(&state->draw_state);
  91
  92    return state;
  93 }
  94
  95
  96
  97 static void
  98 llvmpipe_bind_rasterizer_state(struct pipe_context *pipe, void *handle)
  99 {
 100    struct llvmpipe_context *llvmpipe = llvmpipe_context(pipe);
 101    const struct lp_rast_state *state =
 102       (const struct lp_rast_state *) handle;
 103
 104    if (state) {
 105       llvmpipe->rasterizer = &state->lp_state;
 106       draw_set_rasterizer_state(llvmpipe->draw, &state->draw_state, handle);
 107
 108       /* XXX: just pass lp_state directly to setup.
 109        */
 110       lp_setup_set_triangle_state( llvmpipe->setup,
 111                                    state->lp_state.cull_face,
 112                                    state->lp_state.front_ccw,
 113                                    state->lp_state.scissor,
 114                                    state->lp_state.gl_rasterization_rules);
 115       lp_setup_set_flatshade_first( llvmpipe->setup,
 116                                     state->lp_state.flatshade_first);
 117       lp_setup_set_line_state( llvmpipe->setup,
 118                                state->lp_state.line_width);
 119       lp_setup_set_point_state( llvmpipe->setup,
 120                                 state->lp_state.point_size,
 121                                 state->lp_state.point_size_per_vertex,
 122                                 state->lp_state.sprite_coord_enable,
 123                                 state->lp_state.sprite_coord_mode);
 124    }
 125    else {
 126       llvmpipe->rasterizer = NULL;
 127       draw_set_rasterizer_state(llvmpipe->draw, NULL, handle);
 128    }
 129
 130    llvmpipe->dirty |= LP_NEW_RASTERIZER;
 131 }
 132
 133
 134 static void
 135 llvmpipe_delete_rasterizer_state(struct pipe_context *pipe,
 136                                  void *rasterizer)
 137 {
 138    FREE( rasterizer );
 139 }
 140
 141
 142
 143 void
 144 llvmpipe_init_rasterizer_funcs(struct llvmpipe_context *llvmpipe)
 145 {
 146    llvmpipe->pipe.create_rasterizer_state = llvmpipe_create_rasterizer_state;
 147    llvmpipe->pipe.bind_rasterizer_state   = llvmpipe_bind_rasterizer_state;
 148    llvmpipe->pipe.delete_rasterizer_state = llvmpipe_delete_rasterizer_state;
 149 }