src/mesa/state_tracker/st_cb_drawtex.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
   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 "program/program.h"
  19 #include "program/prog_print.h"
  20
  21 #include "st_context.h"
  22 #include "st_atom.h"
  23 #include "st_cb_drawtex.h"
  24
  25 #include "pipe/p_context.h"
  26 #include "pipe/p_defines.h"
  27 #include "util/u_inlines.h"
  28 #include "pipe/p_shader_tokens.h"
  29 #include "util/u_draw_quad.h"
  30 #include "util/u_simple_shaders.h"
  31 #include "util/u_upload_mgr.h"
  32
  33 #include "cso_cache/cso_context.h"
  34
  35
  36 struct cached_shader
  37 {
  38    void *handle;
  39
  40    uint num_attribs;
  41    uint semantic_names[2 + MAX_TEXTURE_UNITS];
  42    uint semantic_indexes[2 + MAX_TEXTURE_UNITS];
  43 };
  44
  45 #define MAX_SHADERS (2 * MAX_TEXTURE_UNITS)
  46
  47 /**
  48  * Simple linear list cache.
  49  * Most of the time there'll only be one cached shader.
  50  */
  51 static struct cached_shader CachedShaders[MAX_SHADERS];
  52 static GLuint NumCachedShaders = 0;
  53
  54
  55 static void *
  56 lookup_shader(struct pipe_context *pipe,
  57               uint num_attribs,
  58               const uint *semantic_names,
  59               const uint *semantic_indexes)
  60 {
  61    GLuint i, j;
  62
  63    /* look for existing shader with same attributes */
  64    for (i = 0; i < NumCachedShaders; i++) {
  65       if (CachedShaders[i].num_attribs == num_attribs) {
  66          GLboolean match = GL_TRUE;
  67          for (j = 0; j < num_attribs; j++) {
  68             if (semantic_names[j] != CachedShaders[i].semantic_names[j] ||
  69                 semantic_indexes[j] != CachedShaders[i].semantic_indexes[j]) {
  70                match = GL_FALSE;
  71                break;
  72             }
  73          }
  74          if (match)
  75             return CachedShaders[i].handle;
  76       }
  77    }
  78
  79    /* not found - create new one now */
  80    if (NumCachedShaders >= MAX_SHADERS) {
  81       return NULL;
  82    }
  83
  84    CachedShaders[i].num_attribs = num_attribs;
  85    for (j = 0; j < num_attribs; j++) {
  86       CachedShaders[i].semantic_names[j] = semantic_names[j];
  87       CachedShaders[i].semantic_indexes[j] = semantic_indexes[j];
  88    }
  89
  90    CachedShaders[i].handle =
  91       util_make_vertex_passthrough_shader(pipe,
  92                                           num_attribs,
  93                                           semantic_names,
  94                                           semantic_indexes);
  95    NumCachedShaders++;
  96
  97    return CachedShaders[i].handle;
  98 }
  99
 100 static void
 101 st_DrawTex(struct gl_context *ctx, GLfloat x, GLfloat y, GLfloat z,
 102            GLfloat width, GLfloat height)
 103 {
 104    struct st_context *st = ctx->st;
 105    struct pipe_context *pipe = st->pipe;
 106    struct cso_context *cso = ctx->st->cso_context;
 107    struct pipe_resource *vbuffer = NULL;
 108    GLuint i, numTexCoords, numAttribs;
 109    GLboolean emitColor;
 110    uint semantic_names[2 + MAX_TEXTURE_UNITS];
 111    uint semantic_indexes[2 + MAX_TEXTURE_UNITS];
 112    struct pipe_vertex_element velements[2 + MAX_TEXTURE_UNITS];
 113    unsigned offset;
 114
 115    st_validate_state(st);
 116
 117    /* determine if we need vertex color */
 118    if (ctx->FragmentProgram._Current->Base.InputsRead & VARYING_BIT_COL0)
 119       emitColor = GL_TRUE;
 120    else
 121       emitColor = GL_FALSE;
 122
 123    /* determine how many enabled sets of texcoords */
 124    numTexCoords = 0;
 125    for (i = 0; i < ctx->Const.MaxTextureUnits; i++) {
 126       if (ctx->Texture.Unit[i]._ReallyEnabled & TEXTURE_2D_BIT) {
 127          numTexCoords++;
 128       }
 129    }
 130
 131    /* total number of attributes per vertex */
 132    numAttribs = 1 + emitColor + numTexCoords;
 133
 134    /* load vertex buffer */
 135    {
 136 #define SET_ATTRIB(VERT, ATTR, X, Y, Z, W)                              \
 137       do {                                                              \
 138          GLuint k = (((VERT) * numAttribs + (ATTR)) * 4);               \
 139          assert(k < 4 * 4 * numAttribs);                                \
 140          vbuf[k + 0] = X;                                               \
 141          vbuf[k + 1] = Y;                                               \
 142          vbuf[k + 2] = Z;                                               \
 143          vbuf[k + 3] = W;                                               \
 144       } while (0)
 145
 146       const GLfloat x0 = x, y0 = y, x1 = x + width, y1 = y + height;
 147       GLfloat *vbuf = NULL;
 148       GLuint attr;
 149
 150       if (u_upload_alloc(st->uploader, 0,
 151                          numAttribs * 4 * 4 * sizeof(GLfloat),
 152                          &offset, &vbuffer, (void **) &vbuf) != PIPE_OK) {
 153          return;
 154       }
 155
 156       z = CLAMP(z, 0.0f, 1.0f);
 157
 158       /* positions (in clip coords) */
 159       {
 160          const struct gl_framebuffer *fb = st->ctx->DrawBuffer;
 161          const GLfloat fb_width = (GLfloat)fb->Width;
 162          const GLfloat fb_height = (GLfloat)fb->Height;
 163
 164          const GLfloat clip_x0 = (GLfloat)(x0 / fb_width * 2.0 - 1.0);
 165          const GLfloat clip_y0 = (GLfloat)(y0 / fb_height * 2.0 - 1.0);
 166          const GLfloat clip_x1 = (GLfloat)(x1 / fb_width * 2.0 - 1.0);
 167          const GLfloat clip_y1 = (GLfloat)(y1 / fb_height * 2.0 - 1.0);
 168
 169          SET_ATTRIB(0, 0, clip_x0, clip_y0, z, 1.0f);   /* lower left */
 170          SET_ATTRIB(1, 0, clip_x1, clip_y0, z, 1.0f);   /* lower right */
 171          SET_ATTRIB(2, 0, clip_x1, clip_y1, z, 1.0f);   /* upper right */
 172          SET_ATTRIB(3, 0, clip_x0, clip_y1, z, 1.0f);   /* upper left */
 173
 174          semantic_names[0] = TGSI_SEMANTIC_POSITION;
 175          semantic_indexes[0] = 0;
 176       }
 177
 178       /* colors */
 179       if (emitColor) {
 180          const GLfloat *c = ctx->Current.Attrib[VERT_ATTRIB_COLOR0];
 181          SET_ATTRIB(0, 1, c[0], c[1], c[2], c[3]);
 182          SET_ATTRIB(1, 1, c[0], c[1], c[2], c[3]);
 183          SET_ATTRIB(2, 1, c[0], c[1], c[2], c[3]);
 184          SET_ATTRIB(3, 1, c[0], c[1], c[2], c[3]);
 185          semantic_names[1] = TGSI_SEMANTIC_COLOR;
 186          semantic_indexes[1] = 0;
 187          attr = 2;
 188       }
 189       else {
 190          attr = 1;
 191       }
 192
 193       /* texcoords */
 194       for (i = 0; i < ctx->Const.MaxTextureUnits; i++) {
 195          if (ctx->Texture.Unit[i]._ReallyEnabled & TEXTURE_2D_BIT) {
 196             struct gl_texture_object *obj = ctx->Texture.Unit[i]._Current;
 197             struct gl_texture_image *img = obj->Image[0][obj->BaseLevel];
 198             const GLfloat wt = (GLfloat) img->Width;
 199             const GLfloat ht = (GLfloat) img->Height;
 200             const GLfloat s0 = obj->CropRect[0] / wt;
 201             const GLfloat t0 = obj->CropRect[1] / ht;
 202             const GLfloat s1 = (obj->CropRect[0] + obj->CropRect[2]) / wt;
 203             const GLfloat t1 = (obj->CropRect[1] + obj->CropRect[3]) / ht;
 204
 205             /*printf("crop texcoords: %g, %g .. %g, %g\n", s0, t0, s1, t1);*/
 206             SET_ATTRIB(0, attr, s0, t0, 0.0f, 1.0f);  /* lower left */
 207             SET_ATTRIB(1, attr, s1, t0, 0.0f, 1.0f);  /* lower right */
 208             SET_ATTRIB(2, attr, s1, t1, 0.0f, 1.0f);  /* upper right */
 209             SET_ATTRIB(3, attr, s0, t1, 0.0f, 1.0f);  /* upper left */
 210
 211             semantic_names[attr] = st->needs_texcoord_semantic ?
 212                TGSI_SEMANTIC_TEXCOORD : TGSI_SEMANTIC_GENERIC;
 213             /* XXX: should this use semantic index i instead of 0 ? */
 214             semantic_indexes[attr] = 0;
 215
 216             attr++;
 217          }
 218       }
 219
 220       u_upload_unmap(st->uploader);
 221
 222 #undef SET_ATTRIB
 223    }
 224
 225
 226    cso_save_viewport(cso);
 227    cso_save_stream_outputs(cso);
 228    cso_save_vertex_shader(cso);
 229    cso_save_geometry_shader(cso);
 230    cso_save_vertex_elements(cso);
 231    cso_save_aux_vertex_buffer_slot(cso);
 232
 233    {
 234       void *vs = lookup_shader(pipe, numAttribs,
 235                                semantic_names, semantic_indexes);
 236       cso_set_vertex_shader_handle(cso, vs);
 237    }
 238    cso_set_geometry_shader_handle(cso, NULL);
 239
 240    for (i = 0; i < numAttribs; i++) {
 241       velements[i].src_offset = i * 4 * sizeof(float);
 242       velements[i].instance_divisor = 0;
 243       velements[i].vertex_buffer_index = 0;
 244       velements[i].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
 245    }
 246    cso_set_vertex_elements(cso, numAttribs, velements);
 247    cso_set_stream_outputs(st->cso_context, 0, NULL, 0);
 248
 249    /* viewport state: viewport matching window dims */
 250    {
 251       const struct gl_framebuffer *fb = st->ctx->DrawBuffer;
 252       const GLboolean invert = (st_fb_orientation(fb) == Y_0_TOP);
 253       const GLfloat width = (GLfloat)fb->Width;
 254       const GLfloat height = (GLfloat)fb->Height;
 255       struct pipe_viewport_state vp;
 256       vp.scale[0] =  0.5f * width;
 257       vp.scale[1] = height * (invert ? -0.5f : 0.5f);
 258       vp.scale[2] = 1.0f;
 259       vp.scale[3] = 1.0f;
 260       vp.translate[0] = 0.5f * width;
 261       vp.translate[1] = 0.5f * height;
 262       vp.translate[2] = 0.0f;
 263       vp.translate[3] = 0.0f;
 264       cso_set_viewport(cso, &vp);
 265    }
 266
 267
 268    util_draw_vertex_buffer(pipe, cso, vbuffer,
 269                            cso_get_aux_vertex_buffer_slot(cso),
 270                            offset,  /* offset */
 271                            PIPE_PRIM_TRIANGLE_FAN,
 272                            4,  /* verts */
 273                            numAttribs); /* attribs/vert */
 274
 275
 276    pipe_resource_reference(&vbuffer, NULL);
 277
 278    /* restore state */
 279    cso_restore_viewport(cso);
 280    cso_restore_vertex_shader(cso);
 281    cso_restore_geometry_shader(cso);
 282    cso_restore_vertex_elements(cso);
 283    cso_restore_aux_vertex_buffer_slot(cso);
 284    cso_restore_stream_outputs(cso);
 285 }
 286
 287
 288 void
 289 st_init_drawtex_functions(struct dd_function_table *functions)
 290 {
 291    functions->DrawTex = st_DrawTex;
 292 }
 293
 294
 295 /**
 296  * Free any cached shaders
 297  */
 298 void
 299 st_destroy_drawtex(struct st_context *st)
 300 {
 301    GLuint i;
 302    for (i = 0; i < NumCachedShaders; i++) {
 303       cso_delete_vertex_shader(st->cso_context, CachedShaders[i].handle);
 304    }
 305    NumCachedShaders = 0;
 306 }