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_shader.h"
  39 #include "svga_tgsi.h"
  40
  41 #include "svga_hw_reg.h"
  42
  43
  44 static INLINE int
  45 compare_vs_keys(const struct svga_vs_compile_key *a,
  46                 const struct svga_vs_compile_key *b)
  47 {
  48    unsigned keysize = svga_vs_key_size( a );
  49    return memcmp( a, b, keysize );
  50 }
  51
  52
  53 /** Search for a vertex shader variant */
  54 static struct svga_shader_variant *
  55 search_vs_key(const struct svga_vertex_shader *vs,
  56               const struct svga_vs_compile_key *key)
  57 {
  58    struct svga_shader_variant *variant = vs->base.variants;
  59
  60    assert(key);
  61
  62    for ( ; variant; variant = variant->next) {
  63       if (compare_vs_keys( key, &variant->key.vkey ) == 0)
  64          return variant;
  65    }
  66
  67    return NULL;
  68 }
  69
  70
  71 /**
  72  * If we fail to compile a vertex shader we'll use a dummy/fallback shader
  73  * that simply emits a (0,0,0,1) vertex position.
  74  */
  75 static const struct tgsi_token *
  76 get_dummy_vertex_shader(void)
  77 {
  78    static const float zero[4] = { 0.0, 0.0, 0.0, 1.0 };
  79    struct ureg_program *ureg;
  80    const struct tgsi_token *tokens;
  81    struct ureg_src src;
  82    struct ureg_dst dst;
  83    unsigned num_tokens;
  84
  85    ureg = ureg_create(TGSI_PROCESSOR_VERTEX);
  86    if (!ureg)
  87       return NULL;
  88
  89    dst = ureg_DECL_output(ureg, TGSI_SEMANTIC_POSITION, 0);
  90    src = ureg_DECL_immediate(ureg, zero, 4);
  91    ureg_MOV(ureg, dst, src);
  92    ureg_END(ureg);
  93
  94    tokens = ureg_get_tokens(ureg, &num_tokens);
  95
  96    ureg_destroy(ureg);
  97
  98    return tokens;
  99 }
 100
 101
 102 /**
 103  * Translate TGSI shader into an svga shader variant.
 104  */
 105 static enum pipe_error
 106 compile_vs(struct svga_context *svga,
 107            struct svga_vertex_shader *vs,
 108            const struct svga_vs_compile_key *key,
 109            struct svga_shader_variant **out_variant)
 110 {
 111    struct svga_shader_variant *variant;
 112    enum pipe_error ret = PIPE_ERROR;
 113
 114    variant = svga_translate_vertex_program( vs, key );
 115    if (variant == NULL) {
 116       /* some problem during translation, try the dummy shader */
 117       const struct tgsi_token *dummy = get_dummy_vertex_shader();
 118       if (!dummy) {
 119          ret = PIPE_ERROR_OUT_OF_MEMORY;
 120          goto fail;
 121       }
 122       debug_printf("Failed to compile vertex shader, using dummy shader instead.\n");
 123       FREE((void *) vs->base.tokens);
 124       vs->base.tokens = dummy;
 125       variant = svga_translate_vertex_program(vs, key);
 126       if (variant == NULL) {
 127          ret = PIPE_ERROR;
 128          goto fail;
 129       }
 130    }
 131
 132    ret = svga_define_shader(svga, SVGA3D_SHADERTYPE_VS, variant);
 133    if (ret != PIPE_OK)
 134       goto fail;
 135
 136    *out_variant = variant;
 137
 138    /* insert variants at head of linked list */
 139    variant->next = vs->base.variants;
 140    vs->base.variants = variant;
 141
 142    return PIPE_OK;
 143
 144 fail:
 145    if (variant) {
 146       svga_destroy_shader_variant(svga, SVGA3D_SHADERTYPE_VS, variant);
 147    }
 148    return ret;
 149 }
 150
 151 /* SVGA_NEW_PRESCALE, SVGA_NEW_RAST, SVGA_NEW_FS
 152  */
 153 static void
 154 make_vs_key(struct svga_context *svga, struct svga_vs_compile_key *key)
 155 {
 156    memset(key, 0, sizeof *key);
 157    key->need_prescale = svga->state.hw_clear.prescale.enabled;
 158    key->allow_psiz = svga->curr.rast->templ.point_size_per_vertex;
 159
 160    /* SVGA_NEW_FS */
 161    key->fs_generic_inputs = svga->curr.fs->generic_inputs;
 162 }
 163
 164
 165 /**
 166  * svga_reemit_vs_bindings - Reemit the vertex shader bindings
 167  */
 168 enum pipe_error
 169 svga_reemit_vs_bindings(struct svga_context *svga)
 170 {
 171    enum pipe_error ret;
 172    struct svga_winsys_gb_shader *gbshader =
 173       svga->state.hw_draw.vs ? svga->state.hw_draw.vs->gb_shader : NULL;
 174
 175    assert(svga->rebind.vs);
 176    assert(svga_have_gb_objects(svga));
 177
 178    ret = SVGA3D_SetGBShader(svga->swc, SVGA3D_SHADERTYPE_VS, gbshader);
 179    if (ret != PIPE_OK)
 180       return ret;
 181
 182    svga->rebind.vs = FALSE;
 183    return PIPE_OK;
 184 }
 185
 186
 187 static enum pipe_error
 188 emit_hw_vs(struct svga_context *svga, unsigned dirty)
 189 {
 190    struct svga_shader_variant *variant = NULL;
 191    enum pipe_error ret = PIPE_OK;
 192
 193    /* SVGA_NEW_NEED_SWTNL */
 194    if (!svga->state.sw.need_swtnl) {
 195       struct svga_vertex_shader *vs = svga->curr.vs;
 196       struct svga_vs_compile_key key;
 197
 198       make_vs_key( svga, &key );
 199
 200       variant = search_vs_key( vs, &key );
 201       if (!variant) {
 202          ret = compile_vs( svga, vs, &key, &variant );
 203          if (ret != PIPE_OK)
 204             return ret;
 205       }
 206
 207       assert(variant);
 208    }
 209
 210    if (variant != svga->state.hw_draw.vs) {
 211       if (svga_have_gb_objects(svga)) {
 212          struct svga_winsys_gb_shader *gbshader =
 213             variant ? variant->gb_shader : NULL;
 214
 215          /*
 216           * Bind is necessary here only because pipebuffer_fenced may move
 217           * the shader contents around....
 218           */
 219          if (gbshader) {
 220             ret = SVGA3D_BindGBShader(svga->swc, gbshader);
 221             if (ret != PIPE_OK)
 222                return ret;
 223          }
 224
 225          ret = SVGA3D_SetGBShader(svga->swc, SVGA3D_SHADERTYPE_VS, gbshader);
 226          if (ret != PIPE_OK)
 227             return ret;
 228
 229          svga->rebind.vs = FALSE;
 230       }
 231       else {
 232          unsigned id = variant ? variant->id : SVGA_ID_INVALID;
 233          ret = SVGA3D_SetShader(svga->swc, SVGA3D_SHADERTYPE_VS, id);
 234          if (ret != PIPE_OK)
 235             return ret;
 236       }
 237
 238       svga->dirty |= SVGA_NEW_VS_VARIANT;
 239       svga->state.hw_draw.vs = variant;
 240    }
 241
 242    return PIPE_OK;
 243 }
 244
 245 struct svga_tracked_state svga_hw_vs =
 246 {
 247    "vertex shader (hwtnl)",
 248    (SVGA_NEW_VS |
 249     SVGA_NEW_FS |
 250     SVGA_NEW_PRESCALE |
 251     SVGA_NEW_NEED_SWTNL),
 252    emit_hw_vs
 253 };