src/gallium/drivers/svga/svga_state_vs.c

   1 /**********************************************************
   2  * Copyright 2008-2009 VMware, Inc.  All rights reserved.
   3  *
   4  * Permission is hereby granted, free of charge, to any person
   5  * obtaining a copy of this software and associated documentation
   6  * files (the "Software"), to deal in the Software without
   7  * restriction, including without limitation the rights to use, copy,
   8  * modify, merge, publish, distribute, sublicense, and/or sell copies
   9  * of the Software, and to permit persons to whom the Software is
  10  * furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be
  13  * included in all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  16  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  18  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  19  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  20  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  21  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  22  * SOFTWARE.
  23  *
  24  **********************************************************/
  25
  26 #include "util/u_inlines.h"
  27 #include "pipe/p_defines.h"
  28 #include "util/u_format.h"
  29 #include "util/u_math.h"
  30 #include "util/u_memory.h"
  31 #include "util/u_bitmask.h"
  32 #include "translate/translate.h"
  33 #include "tgsi/tgsi_ureg.h"
  34
  35 #include "svga_context.h"
  36 #include "svga_state.h"
  37 #include "svga_cmd.h"
  38 #include "svga_tgsi.h"
  39
  40 #include "svga_hw_reg.h"
  41
  42 /***********************************************************************
  43  */
  44
  45
  46 static INLINE int compare_vs_keys( const struct svga_vs_compile_key *a,
  47                                    const struct svga_vs_compile_key *b )
  48 {
  49    unsigned keysize = svga_vs_key_size( a );
  50    return memcmp( a, b, keysize );
  51 }
  52
  53
  54 static struct svga_shader_result *search_vs_key( struct svga_vertex_shader *vs,
  55                                                  const struct svga_vs_compile_key *key )
  56 {
  57    struct svga_shader_result *result = vs->base.results;
  58
  59    assert(key);
  60
  61    for ( ; result; result = result->next) {
  62       if (compare_vs_keys( key, &result->key.vkey ) == 0)
  63          return result;
  64    }
  65
  66    return NULL;
  67 }
  68
  69
  70 /**
  71  * If we fail to compile a vertex shader we'll use a dummy/fallback shader
  72  * that simply emits a (0,0,0,1) vertex position.
  73  */
  74 static const struct tgsi_token *
  75 get_dummy_vertex_shader(void)
  76 {
  77    static const float zero[4] = { 0.0, 0.0, 0.0, 1.0 };
  78    struct ureg_program *ureg;
  79    const struct tgsi_token *tokens;
  80    struct ureg_src src;
  81    struct ureg_dst dst;
  82    unsigned num_tokens;
  83
  84    ureg = ureg_create(TGSI_PROCESSOR_VERTEX);
  85    if (!ureg)
  86       return NULL;
  87
  88    dst = ureg_DECL_output(ureg, TGSI_SEMANTIC_POSITION, 0);
  89    src = ureg_DECL_immediate(ureg, zero, 4);
  90    ureg_MOV(ureg, dst, src);
  91    ureg_END(ureg);
  92
  93    tokens = ureg_get_tokens(ureg, &num_tokens);
  94
  95    ureg_destroy(ureg);
  96
  97    return tokens;
  98 }
  99
 100
 101 static enum pipe_error compile_vs( struct svga_context *svga,
 102                                    struct svga_vertex_shader *vs,
 103                                    const struct svga_vs_compile_key *key,
 104                                    struct svga_shader_result **out_result )
 105 {
 106    struct svga_shader_result *result;
 107    enum pipe_error ret = PIPE_ERROR;
 108
 109    result = svga_translate_vertex_program( vs, key );
 110    if (result == NULL) {
 111       /* some problem during translation, try the dummy shader */
 112       const struct tgsi_token *dummy = get_dummy_vertex_shader();
 113       if (!dummy) {
 114          ret = PIPE_ERROR_OUT_OF_MEMORY;
 115          goto fail;
 116       }
 117       debug_printf("Failed to compile vertex shader, using dummy shader instead.\n");
 118       FREE((void *) vs->base.tokens);
 119       vs->base.tokens = dummy;
 120       result = svga_translate_vertex_program(vs, key);
 121       if (result == NULL) {
 122          ret = PIPE_ERROR;
 123          goto fail;
 124       }
 125    }
 126
 127    result->id = util_bitmask_add(svga->vs_bm);
 128    if(result->id == UTIL_BITMASK_INVALID_INDEX) {
 129       ret = PIPE_ERROR_OUT_OF_MEMORY;
 130       goto fail;
 131    }
 132
 133    ret = SVGA3D_DefineShader(svga->swc,
 134                              result->id,
 135                              SVGA3D_SHADERTYPE_VS,
 136                              result->tokens,
 137                              result->nr_tokens * sizeof result->tokens[0]);
 138    if (ret != PIPE_OK)
 139       goto fail;
 140
 141    *out_result = result;
 142    result->next = vs->base.results;
 143    vs->base.results = result;
 144    return PIPE_OK;
 145
 146 fail:
 147    if (result) {
 148       if (result->id != UTIL_BITMASK_INVALID_INDEX)
 149          util_bitmask_clear( svga->vs_bm, result->id );
 150       svga_destroy_shader_result( result );
 151    }
 152    return ret;
 153 }
 154
 155 /* SVGA_NEW_PRESCALE, SVGA_NEW_RAST, SVGA_NEW_FS
 156  */
 157 static void
 158 make_vs_key(struct svga_context *svga, struct svga_vs_compile_key *key)
 159 {
 160    memset(key, 0, sizeof *key);
 161    key->need_prescale = svga->state.hw_clear.prescale.enabled;
 162    key->allow_psiz = svga->curr.rast->templ.point_size_per_vertex;
 163
 164    /* SVGA_NEW_FS */
 165    key->fs_generic_inputs = svga->curr.fs->generic_inputs;
 166 }
 167
 168
 169
 170 static enum pipe_error
 171 emit_hw_vs(struct svga_context *svga, unsigned dirty)
 172 {
 173    struct svga_shader_result *result = NULL;
 174    unsigned id = SVGA3D_INVALID_ID;
 175    enum pipe_error ret = PIPE_OK;
 176
 177    /* SVGA_NEW_NEED_SWTNL */
 178    if (!svga->state.sw.need_swtnl) {
 179       struct svga_vertex_shader *vs = svga->curr.vs;
 180       struct svga_vs_compile_key key;
 181
 182       make_vs_key( svga, &key );
 183
 184       result = search_vs_key( vs, &key );
 185       if (!result) {
 186          ret = compile_vs( svga, vs, &key, &result );
 187          if (ret != PIPE_OK)
 188             return ret;
 189       }
 190
 191       assert (result);
 192       id = result->id;
 193    }
 194
 195    if (result != svga->state.hw_draw.vs) {
 196       ret = SVGA3D_SetShader(svga->swc,
 197                              SVGA3D_SHADERTYPE_VS,
 198                              id );
 199       if (ret != PIPE_OK)
 200          return ret;
 201
 202       svga->dirty |= SVGA_NEW_VS_RESULT;
 203       svga->state.hw_draw.vs = result;
 204    }
 205
 206    return PIPE_OK;
 207 }
 208
 209 struct svga_tracked_state svga_hw_vs =
 210 {
 211    "vertex shader (hwtnl)",
 212    (SVGA_NEW_VS |
 213     SVGA_NEW_FS |
 214     SVGA_NEW_PRESCALE |
 215     SVGA_NEW_NEED_SWTNL),
 216    emit_hw_vs
 217 };