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