src/mesa/state_tracker/st_cb_drawtex.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2008 VMware, Inc.
   4  * All Rights Reserved.
   5  *
   6  **************************************************************************/
   7
   8
   9 /**
  10  * Implementation of glDrawTex() for GL_OES_draw_tex
  11  */
  12
  13
  14
  15 #include "main/imports.h"
  16 #include "main/image.h"
  17 #include "main/macros.h"
  18 #include "main/teximage.h"
  19 #include "main/framebuffer.h"
  20 #include "program/program.h"
  21 #include "program/prog_print.h"
  22
  23 #include "st_context.h"
  24 #include "st_atom.h"
  25 #include "st_cb_bitmap.h"
  26 #include "st_cb_drawtex.h"
  27 #include "st_nir.h"
  28
  29 #include "pipe/p_context.h"
  30 #include "pipe/p_defines.h"
  31 #include "util/u_inlines.h"
  32 #include "pipe/p_shader_tokens.h"
  33 #include "util/u_draw_quad.h"
  34 #include "util/u_simple_shaders.h"
  35 #include "util/u_upload_mgr.h"
  36
  37 #include "cso_cache/cso_context.h"
  38
  39
  40 struct cached_shader
  41 {
  42    void *handle;
  43
  44    uint num_attribs;
  45    uint semantic_names[2 + MAX_TEXTURE_UNITS];
  46    uint semantic_indexes[2 + MAX_TEXTURE_UNITS];
  47 };
  48
  49 #define MAX_SHADERS (2 * MAX_TEXTURE_UNITS)
  50
  51 /**
  52  * Simple linear list cache.
  53  * Most of the time there'll only be one cached shader.
  54  * XXX This should be per-st_context state.
  55  */
  56 static struct cached_shader CachedShaders[MAX_SHADERS];
  57 static GLuint NumCachedShaders = 0;
  58
  59 static gl_vert_attrib
  60 semantic_to_vert_attrib(unsigned semantic)
  61 {
  62    switch (semantic) {
  63    case TGSI_SEMANTIC_POSITION:
  64       return VERT_ATTRIB_POS;
  65    case TGSI_SEMANTIC_COLOR:
  66       return VERT_ATTRIB_COLOR0;
  67    case TGSI_SEMANTIC_GENERIC:
  68    case TGSI_SEMANTIC_TEXCOORD:
  69       return VERT_ATTRIB_GENERIC0;
  70    default:
  71       unreachable("unhandled semantic");
  72    }
  73 }
  74
  75 static gl_varying_slot
  76 semantic_to_varying_slot(unsigned semantic)
  77 {
  78    switch (semantic) {
  79    case TGSI_SEMANTIC_POSITION:
  80       return VARYING_SLOT_POS;
  81    case TGSI_SEMANTIC_COLOR:
  82       return VARYING_SLOT_COL0;
  83    case TGSI_SEMANTIC_GENERIC:
  84    case TGSI_SEMANTIC_TEXCOORD:
  85       return VARYING_SLOT_TEX0;
  86    default:
  87       unreachable("unhandled semantic");
  88    }
  89 }
  90
  91 static void *
  92 lookup_shader(struct st_context *st,
  93               uint num_attribs,
  94               const uint *semantic_names,
  95               const uint *semantic_indexes)
  96 {
  97    struct pipe_context *pipe = st->pipe;
  98    struct pipe_screen *screen = pipe->screen;
  99    GLuint i, j;
 100
 101    /* look for existing shader with same attributes */
 102    for (i = 0; i < NumCachedShaders; i++) {
 103       if (CachedShaders[i].num_attribs == num_attribs) {
 104          GLboolean match = GL_TRUE;
 105          for (j = 0; j < num_attribs; j++) {
 106             if (semantic_names[j] != CachedShaders[i].semantic_names[j] ||
 107                 semantic_indexes[j] != CachedShaders[i].semantic_indexes[j]) {
 108                match = GL_FALSE;
 109                break;
 110             }
 111          }
 112          if (match)
 113             return CachedShaders[i].handle;
 114       }
 115    }
 116
 117    /* not found - create new one now */
 118    if (NumCachedShaders >= MAX_SHADERS) {
 119       return NULL;
 120    }
 121
 122    CachedShaders[i].num_attribs = num_attribs;
 123    for (j = 0; j < num_attribs; j++) {
 124       CachedShaders[i].semantic_names[j] = semantic_names[j];
 125       CachedShaders[i].semantic_indexes[j] = semantic_indexes[j];
 126    }
 127
 128    enum pipe_shader_ir preferred_ir =
 129       screen->get_shader_param(screen, MESA_SHADER_VERTEX,
 130                                PIPE_SHADER_CAP_PREFERRED_IR);
 131
 132    if (preferred_ir == PIPE_SHADER_IR_NIR) {
 133       unsigned inputs[2 + MAX_TEXTURE_UNITS];
 134       unsigned outputs[2 + MAX_TEXTURE_UNITS];
 135
 136       for (int j = 0; j < num_attribs; j++) {
 137          inputs[j] = semantic_to_vert_attrib(semantic_names[j]);
 138          outputs[j] = semantic_to_varying_slot(semantic_names[j]);
 139       }
 140
 141       CachedShaders[i].handle =
 142          st_nir_make_passthrough_shader(st, "st/drawtex VS",
 143                                         MESA_SHADER_VERTEX,
 144                                         num_attribs, inputs,
 145                                         outputs, NULL, 0);
 146    } else {
 147       CachedShaders[i].handle =
 148          util_make_vertex_passthrough_shader(pipe,
 149                                              num_attribs,
 150                                              semantic_names,
 151                                              semantic_indexes, FALSE);
 152    }
 153
 154    NumCachedShaders++;
 155
 156    return CachedShaders[i].handle;
 157 }
 158
 159
 160 static void
 161 st_DrawTex(struct gl_context *ctx, GLfloat x, GLfloat y, GLfloat z,
 162            GLfloat width, GLfloat height)
 163 {
 164    struct st_context *st = ctx->st;
 165    struct pipe_context *pipe = st->pipe;
 166    struct cso_context *cso = st->cso_context;
 167    struct pipe_resource *vbuffer = NULL;
 168    GLuint i, numTexCoords, numAttribs;
 169    GLboolean emitColor;
 170    uint semantic_names[2 + MAX_TEXTURE_UNITS];
 171    uint semantic_indexes[2 + MAX_TEXTURE_UNITS];
 172    struct pipe_vertex_element velements[2 + MAX_TEXTURE_UNITS];
 173    unsigned offset;
 174
 175    st_flush_bitmap_cache(st);
 176    st_invalidate_readpix_cache(st);
 177
 178    st_validate_state(st, ST_PIPELINE_META);
 179
 180    /* determine if we need vertex color */
 181    if (ctx->FragmentProgram._Current->info.inputs_read & VARYING_BIT_COL0)
 182       emitColor = GL_TRUE;
 183    else
 184       emitColor = GL_FALSE;
 185
 186    /* determine how many enabled sets of texcoords */
 187    numTexCoords = 0;
 188    for (i = 0; i < ctx->Const.MaxTextureUnits; i++) {
 189       if (ctx->Texture.Unit[i]._Current &&
 190           ctx->Texture.Unit[i]._Current->Target == GL_TEXTURE_2D) {
 191          numTexCoords++;
 192       }
 193    }
 194
 195    /* total number of attributes per vertex */
 196    numAttribs = 1 + emitColor + numTexCoords;
 197
 198    /* load vertex buffer */
 199    {
 200 #define SET_ATTRIB(VERT, ATTR, X, Y, Z, W)                              \
 201       do {                                                              \
 202          GLuint k = (((VERT) * numAttribs + (ATTR)) * 4);               \
 203          assert(k < 4 * 4 * numAttribs);                                \
 204          vbuf[k + 0] = X;                                               \
 205          vbuf[k + 1] = Y;                                               \
 206          vbuf[k + 2] = Z;                                               \
 207          vbuf[k + 3] = W;                                               \
 208       } while (0)
 209
 210       const GLfloat x0 = x, y0 = y, x1 = x + width, y1 = y + height;
 211       GLfloat *vbuf = NULL;
 212       GLuint tex_attr;
 213
 214       u_upload_alloc(pipe->stream_uploader, 0,
 215                      numAttribs * 4 * 4 * sizeof(GLfloat), 4,
 216                      &offset, &vbuffer, (void **) &vbuf);
 217       if (!vbuffer) {
 218          return;
 219       }
 220
 221       z = CLAMP(z, 0.0f, 1.0f);
 222
 223       /* positions (in clip coords) */
 224       {
 225          const struct gl_framebuffer *fb = ctx->DrawBuffer;
 226          const GLfloat fb_width = (GLfloat)_mesa_geometric_width(fb);
 227          const GLfloat fb_height = (GLfloat)_mesa_geometric_height(fb);
 228
 229          const GLfloat clip_x0 = (GLfloat)(x0 / fb_width * 2.0 - 1.0);
 230          const GLfloat clip_y0 = (GLfloat)(y0 / fb_height * 2.0 - 1.0);
 231          const GLfloat clip_x1 = (GLfloat)(x1 / fb_width * 2.0 - 1.0);
 232          const GLfloat clip_y1 = (GLfloat)(y1 / fb_height * 2.0 - 1.0);
 233
 234          SET_ATTRIB(0, 0, clip_x0, clip_y0, z, 1.0f);   /* lower left */
 235          SET_ATTRIB(1, 0, clip_x1, clip_y0, z, 1.0f);   /* lower right */
 236          SET_ATTRIB(2, 0, clip_x1, clip_y1, z, 1.0f);   /* upper right */
 237          SET_ATTRIB(3, 0, clip_x0, clip_y1, z, 1.0f);   /* upper left */
 238
 239          semantic_names[0] = TGSI_SEMANTIC_POSITION;
 240          semantic_indexes[0] = 0;
 241       }
 242
 243       /* colors */
 244       if (emitColor) {
 245          const GLfloat *c = ctx->Current.Attrib[VERT_ATTRIB_COLOR0];
 246          SET_ATTRIB(0, 1, c[0], c[1], c[2], c[3]);
 247          SET_ATTRIB(1, 1, c[0], c[1], c[2], c[3]);
 248          SET_ATTRIB(2, 1, c[0], c[1], c[2], c[3]);
 249          SET_ATTRIB(3, 1, c[0], c[1], c[2], c[3]);
 250          semantic_names[1] = TGSI_SEMANTIC_COLOR;
 251          semantic_indexes[1] = 0;
 252          tex_attr = 2;
 253       }
 254       else {
 255          tex_attr = 1;
 256       }
 257
 258       /* texcoords */
 259       for (i = 0; i < ctx->Const.MaxTextureUnits; i++) {
 260          if (ctx->Texture.Unit[i]._Current &&
 261              ctx->Texture.Unit[i]._Current->Target == GL_TEXTURE_2D) {
 262             struct gl_texture_object *obj = ctx->Texture.Unit[i]._Current;
 263             const struct gl_texture_image *img = _mesa_base_tex_image(obj);
 264             const GLfloat wt = (GLfloat) img->Width;
 265             const GLfloat ht = (GLfloat) img->Height;
 266             const GLfloat s0 = obj->CropRect[0] / wt;
 267             const GLfloat t0 = obj->CropRect[1] / ht;
 268             const GLfloat s1 = (obj->CropRect[0] + obj->CropRect[2]) / wt;
 269             const GLfloat t1 = (obj->CropRect[1] + obj->CropRect[3]) / ht;
 270
 271             /*printf("crop texcoords: %g, %g .. %g, %g\n", s0, t0, s1, t1);*/
 272             SET_ATTRIB(0, tex_attr, s0, t0, 0.0f, 1.0f);  /* lower left */
 273             SET_ATTRIB(1, tex_attr, s1, t0, 0.0f, 1.0f);  /* lower right */
 274             SET_ATTRIB(2, tex_attr, s1, t1, 0.0f, 1.0f);  /* upper right */
 275             SET_ATTRIB(3, tex_attr, s0, t1, 0.0f, 1.0f);  /* upper left */
 276
 277             semantic_names[tex_attr] = st->needs_texcoord_semantic ?
 278                TGSI_SEMANTIC_TEXCOORD : TGSI_SEMANTIC_GENERIC;
 279             /* XXX: should this use semantic index i instead of 0 ? */
 280             semantic_indexes[tex_attr] = 0;
 281
 282             tex_attr++;
 283          }
 284       }
 285
 286       u_upload_unmap(pipe->stream_uploader);
 287
 288 #undef SET_ATTRIB
 289    }
 290
 291    cso_save_state(cso, (CSO_BIT_VIEWPORT |
 292                         CSO_BIT_STREAM_OUTPUTS |
 293                         CSO_BIT_VERTEX_SHADER |
 294                         CSO_BIT_TESSCTRL_SHADER |
 295                         CSO_BIT_TESSEVAL_SHADER |
 296                         CSO_BIT_GEOMETRY_SHADER |
 297                         CSO_BIT_VERTEX_ELEMENTS |
 298                         CSO_BIT_AUX_VERTEX_BUFFER_SLOT));
 299
 300    {
 301       void *vs = lookup_shader(st, numAttribs,
 302                                semantic_names, semantic_indexes);
 303       cso_set_vertex_shader_handle(cso, vs);
 304    }
 305    cso_set_tessctrl_shader_handle(cso, NULL);
 306    cso_set_tesseval_shader_handle(cso, NULL);
 307    cso_set_geometry_shader_handle(cso, NULL);
 308
 309    for (i = 0; i < numAttribs; i++) {
 310       velements[i].src_offset = i * 4 * sizeof(float);
 311       velements[i].instance_divisor = 0;
 312       velements[i].vertex_buffer_index = 0;
 313       velements[i].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
 314    }
 315    cso_set_vertex_elements(cso, numAttribs, velements);
 316    cso_set_stream_outputs(cso, 0, NULL, NULL);
 317
 318    /* viewport state: viewport matching window dims */
 319    {
 320       const struct gl_framebuffer *fb = ctx->DrawBuffer;
 321       const GLboolean invert = (st_fb_orientation(fb) == Y_0_TOP);
 322       const GLfloat width = (GLfloat)_mesa_geometric_width(fb);
 323       const GLfloat height = (GLfloat)_mesa_geometric_height(fb);
 324       struct pipe_viewport_state vp;
 325       vp.scale[0] =  0.5f * width;
 326       vp.scale[1] = height * (invert ? -0.5f : 0.5f);
 327       vp.scale[2] = 1.0f;
 328       vp.translate[0] = 0.5f * width;
 329       vp.translate[1] = 0.5f * height;
 330       vp.translate[2] = 0.0f;
 331       cso_set_viewport(cso, &vp);
 332    }
 333
 334    util_draw_vertex_buffer(pipe, cso, vbuffer, 0,
 335                            offset,  /* offset */
 336                            PIPE_PRIM_TRIANGLE_FAN,
 337                            4,  /* verts */
 338                            numAttribs); /* attribs/vert */
 339
 340    pipe_resource_reference(&vbuffer, NULL);
 341
 342    /* restore state */
 343    cso_restore_state(cso);
 344 }
 345
 346
 347 void
 348 st_init_drawtex_functions(struct dd_function_table *functions)
 349 {
 350    functions->DrawTex = st_DrawTex;
 351 }
 352
 353
 354 /**
 355  * Free any cached shaders
 356  */
 357 void
 358 st_destroy_drawtex(struct st_context *st)
 359 {
 360    GLuint i;
 361    for (i = 0; i < NumCachedShaders; i++) {
 362       cso_delete_vertex_shader(st->cso_context, CachedShaders[i].handle);
 363    }
 364    NumCachedShaders = 0;
 365 }