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