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 static INLINE int
  44 compare_vs_keys(const struct svga_vs_compile_key *a,
  45                 const struct svga_vs_compile_key *b)
  46 {
  47    unsigned keysize = svga_vs_key_size( a );
  48    return memcmp( a, b, keysize );
  49 }
  50
  51
  52 /** Search for a vertex shader variant */
  53 static struct svga_shader_variant *
  54 search_vs_key(const struct svga_vertex_shader *vs,
  55               const struct svga_vs_compile_key *key)
  56 {
  57    struct svga_shader_variant *variant = vs->base.variants;
  58
  59    assert(key);
  60
  61    for ( ; variant; variant = variant->next) {
  62       if (compare_vs_keys( key, &variant->key.vkey ) == 0)
  63          return variant;
  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 /**
 102  * Translate TGSI shader into an svga shader variant.
 103  */
 104 static enum pipe_error
 105 compile_vs(struct svga_context *svga,
 106            struct svga_vertex_shader *vs,
 107            const struct svga_vs_compile_key *key,
 108            struct svga_shader_variant **out_variant)
 109 {
 110    struct svga_shader_variant *variant;
 111    enum pipe_error ret = PIPE_ERROR;
 112
 113    variant = svga_translate_vertex_program( vs, key );
 114    if (variant == NULL) {
 115       /* some problem during translation, try the dummy shader */
 116       const struct tgsi_token *dummy = get_dummy_vertex_shader();
 117       if (!dummy) {
 118          ret = PIPE_ERROR_OUT_OF_MEMORY;
 119          goto fail;
 120       }
 121       debug_printf("Failed to compile vertex shader, using dummy shader instead.\n");
 122       FREE((void *) vs->base.tokens);
 123       vs->base.tokens = dummy;
 124       variant = svga_translate_vertex_program(vs, key);
 125       if (variant == NULL) {
 126          ret = PIPE_ERROR;
 127          goto fail;
 128       }
 129    }
 130
 131    variant->id = util_bitmask_add(svga->vs_bm);
 132    if(variant->id == UTIL_BITMASK_INVALID_INDEX) {
 133       ret = PIPE_ERROR_OUT_OF_MEMORY;
 134       goto fail;
 135    }
 136
 137    ret = SVGA3D_DefineShader(svga->swc,
 138                              variant->id,
 139                              SVGA3D_SHADERTYPE_VS,
 140                              variant->tokens,
 141                              variant->nr_tokens * sizeof variant->tokens[0]);
 142    if (ret != PIPE_OK)
 143       goto fail;
 144
 145    *out_variant = variant;
 146    variant->next = vs->base.variants;
 147    vs->base.variants = variant;
 148    return PIPE_OK;
 149
 150 fail:
 151    if (variant) {
 152       if (variant->id != UTIL_BITMASK_INVALID_INDEX)
 153          util_bitmask_clear( svga->vs_bm, variant->id );
 154       svga_destroy_shader_variant( variant );
 155    }
 156    return ret;
 157 }
 158
 159 /* SVGA_NEW_PRESCALE, SVGA_NEW_RAST, SVGA_NEW_FS
 160  */
 161 static void
 162 make_vs_key(struct svga_context *svga, struct svga_vs_compile_key *key)
 163 {
 164    memset(key, 0, sizeof *key);
 165    key->need_prescale = svga->state.hw_clear.prescale.enabled;
 166    key->allow_psiz = svga->curr.rast->templ.point_size_per_vertex;
 167
 168    /* SVGA_NEW_FS */
 169    key->fs_generic_inputs = svga->curr.fs->generic_inputs;
 170 }
 171
 172
 173
 174 static enum pipe_error
 175 emit_hw_vs(struct svga_context *svga, unsigned dirty)
 176 {
 177    struct svga_shader_variant *variant = NULL;
 178    unsigned id = SVGA3D_INVALID_ID;
 179    enum pipe_error ret = PIPE_OK;
 180
 181    /* SVGA_NEW_NEED_SWTNL */
 182    if (!svga->state.sw.need_swtnl) {
 183       struct svga_vertex_shader *vs = svga->curr.vs;
 184       struct svga_vs_compile_key key;
 185
 186       make_vs_key( svga, &key );
 187
 188       variant = search_vs_key( vs, &key );
 189       if (!variant) {
 190          ret = compile_vs( svga, vs, &key, &variant );
 191          if (ret != PIPE_OK)
 192             return ret;
 193       }
 194
 195       assert (variant);
 196       id = variant->id;
 197    }
 198
 199    if (variant != svga->state.hw_draw.vs) {
 200       ret = SVGA3D_SetShader(svga->swc,
 201                              SVGA3D_SHADERTYPE_VS,
 202                              id );
 203       if (ret != PIPE_OK)
 204          return ret;
 205
 206       svga->dirty |= SVGA_NEW_VS_VARIANT;
 207       svga->state.hw_draw.vs = variant;
 208    }
 209
 210    return PIPE_OK;
 211 }
 212
 213 struct svga_tracked_state svga_hw_vs =
 214 {
 215    "vertex shader (hwtnl)",
 216    (SVGA_NEW_VS |
 217     SVGA_NEW_FS |
 218     SVGA_NEW_PRESCALE |
 219     SVGA_NEW_NEED_SWTNL),
 220    emit_hw_vs
 221 };