src/gallium/drivers/llvmpipe/lp_state_rasterizer.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 VMware, Inc.
   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
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  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 VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
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  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->point_smooth ||
  82                     rast->line_smooth ||
  83                     rast->line_stipple_enable ||
  84                     rast->poly_stipple_enable);
  85
  86    /* If not using the pipeline, clear out the flags which we can
  87     * handle ourselves.  If we *are* using the pipeline, do everything
  88     * on the pipeline and clear those flags on our internal copy of
  89     * the state.
  90     */
  91    if (need_pipeline)
  92       clear_flags(&state->lp_state);
  93    else
  94       clear_flags(&state->draw_state);
  95
  96    return state;
  97 }
  98
  99
 100
 101 static void
 102 llvmpipe_bind_rasterizer_state(struct pipe_context *pipe, void *handle)
 103 {
 104    struct llvmpipe_context *llvmpipe = llvmpipe_context(pipe);
 105    const struct lp_rast_state *state =
 106       (const struct lp_rast_state *) handle;
 107
 108    if (state) {
 109       llvmpipe->rasterizer = &state->lp_state;
 110       draw_set_rasterizer_state(llvmpipe->draw, &state->draw_state, handle);
 111
 112       /* XXX: just pass lp_state directly to setup.
 113        */
 114       lp_setup_set_triangle_state( llvmpipe->setup,
 115                                   state->lp_state.cull_face,
 116                                   state->lp_state.front_ccw,
 117                                   state->lp_state.scissor,
 118                                   state->lp_state.half_pixel_center,
 119                                   state->lp_state.bottom_edge_rule);
 120       lp_setup_set_flatshade_first( llvmpipe->setup,
 121                                     state->lp_state.flatshade_first);
 122       lp_setup_set_line_state( llvmpipe->setup,
 123                               state->lp_state.line_width);
 124       lp_setup_set_point_state( llvmpipe->setup,
 125                                state->lp_state.point_size,
 126                                state->lp_state.point_size_per_vertex,
 127                                state->lp_state.sprite_coord_enable,
 128                                state->lp_state.sprite_coord_mode);
 129    }
 130    else {
 131       llvmpipe->rasterizer = NULL;
 132       draw_set_rasterizer_state(llvmpipe->draw, NULL, handle);
 133    }
 134
 135    llvmpipe->dirty |= LP_NEW_RASTERIZER;
 136 }
 137
 138
 139 static void
 140 llvmpipe_delete_rasterizer_state(struct pipe_context *pipe,
 141                                  void *rasterizer)
 142 {
 143    FREE( rasterizer );
 144 }
 145
 146
 147
 148 void
 149 llvmpipe_init_rasterizer_funcs(struct llvmpipe_context *llvmpipe)
 150 {
 151    llvmpipe->pipe.create_rasterizer_state = llvmpipe_create_rasterizer_state;
 152    llvmpipe->pipe.bind_rasterizer_state   = llvmpipe_bind_rasterizer_state;
 153    llvmpipe->pipe.delete_rasterizer_state = llvmpipe_delete_rasterizer_state;
 154 }