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
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  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    rast->offset_line = 0;
  50    rast->offset_point = 0;
  51    rast->offset_units = 0.0f;
  52    rast->offset_scale = 0.0f;
  53 }
  54
  55
  56
  57 static void *
  58 llvmpipe_create_rasterizer_state(struct pipe_context *pipe,
  59                                  const struct pipe_rasterizer_state *rast)
  60 {
  61    boolean need_pipeline;
  62
  63    /* Partition rasterizer state into what we want the draw module to
  64     * handle, and what we'll look after ourselves.
  65     */
  66    struct lp_rast_state *state = MALLOC_STRUCT(lp_rast_state);
  67    if (state == NULL)
  68       return NULL;
  69
  70    memcpy(&state->draw_state, rast, sizeof *rast);
  71    memcpy(&state->lp_state, rast, sizeof *rast);
  72
  73    /* We rely on draw module to do unfilled polyons, AA lines and
  74     * points and stipple.
  75     *
  76     * Over time, reduce this list of conditions, and expand the list
  77     * of flags which get cleared in clear_flags().
  78     */
  79    need_pipeline = (rast->fill_front != PIPE_POLYGON_MODE_FILL ||
  80                     rast->fill_back != PIPE_POLYGON_MODE_FILL ||
  81                     rast->offset_point ||
  82                     rast->offset_line ||
  83                     rast->point_smooth ||
  84                     rast->line_smooth ||
  85                     rast->line_stipple_enable ||
  86                     rast->poly_stipple_enable);
  87
  88    /* If not using the pipeline, clear out the flags which we can
  89     * handle ourselves.  If we *are* using the pipeline, do everything
  90     * on the pipeline and clear those flags on our internal copy of
  91     * the state.
  92     */
  93    if (need_pipeline)
  94       clear_flags(&state->lp_state);
  95    else
  96       clear_flags(&state->draw_state);
  97
  98    return state;
  99 }
 100
 101
 102
 103 static void
 104 llvmpipe_bind_rasterizer_state(struct pipe_context *pipe, void *handle)
 105 {
 106    struct llvmpipe_context *llvmpipe = llvmpipe_context(pipe);
 107    const struct lp_rast_state *state =
 108       (const struct lp_rast_state *) handle;
 109
 110    if (state) {
 111       llvmpipe->rasterizer = &state->lp_state;
 112       draw_set_rasterizer_state(llvmpipe->draw, &state->draw_state, handle);
 113
 114       /* XXX: just pass lp_state directly to setup.
 115        */
 116       lp_setup_set_triangle_state( llvmpipe->setup,
 117                                    state->lp_state.cull_face,
 118                                    state->lp_state.front_ccw,
 119                                    state->lp_state.scissor,
 120                                    state->lp_state.gl_rasterization_rules);
 121       lp_setup_set_flatshade_first( llvmpipe->setup,
 122                                     state->lp_state.flatshade_first);
 123       lp_setup_set_rasterizer_discard( llvmpipe->setup,
 124                                     state->lp_state.rasterizer_discard);
 125       lp_setup_set_line_state( llvmpipe->setup,
 126                                state->lp_state.line_width);
 127       lp_setup_set_point_state( llvmpipe->setup,
 128                                 state->lp_state.point_size,
 129                                 state->lp_state.point_size_per_vertex,
 130                                 state->lp_state.sprite_coord_enable,
 131                                 state->lp_state.sprite_coord_mode);
 132    }
 133    else {
 134       llvmpipe->rasterizer = NULL;
 135       draw_set_rasterizer_state(llvmpipe->draw, NULL, handle);
 136    }
 137
 138    llvmpipe->dirty |= LP_NEW_RASTERIZER;
 139 }
 140
 141
 142 static void
 143 llvmpipe_delete_rasterizer_state(struct pipe_context *pipe,
 144                                  void *rasterizer)
 145 {
 146    FREE( rasterizer );
 147 }
 148
 149
 150
 151 void
 152 llvmpipe_init_rasterizer_funcs(struct llvmpipe_context *llvmpipe)
 153 {
 154    llvmpipe->pipe.create_rasterizer_state = llvmpipe_create_rasterizer_state;
 155    llvmpipe->pipe.bind_rasterizer_state   = llvmpipe_bind_rasterizer_state;
 156    llvmpipe->pipe.delete_rasterizer_state = llvmpipe_delete_rasterizer_state;
 157 }