src/mesa/es/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/bufferobj.h"
  18 #include "main/drawtex.h"
  19 #include "main/macros.h"
  20 #include "main/state.h"
  21 #include "main/texformat.h"
  22 #include "shader/program.h"
  23 #include "shader/prog_parameter.h"
  24 #include "shader/prog_print.h"
  25
  26 #include "st_context.h"
  27 #include "st_atom.h"
  28 #include "st_atom_constbuf.h"
  29 #include "st_draw.h"
  30 #include "st_cb_drawtex.h"
  31
  32 #include "pipe/p_context.h"
  33 #include "pipe/p_defines.h"
  34 #include "util/u_inlines.h"
  35 #include "pipe/p_shader_tokens.h"
  36 #include "util/u_tile.h"
  37 #include "util/u_draw_quad.h"
  38 #include "util/u_simple_shaders.h"
  39
  40 #include "cso_cache/cso_context.h"
  41
  42
  43 struct cached_shader
  44 {
  45    //struct pipe_shader_state shader;
  46    void *handle;
  47
  48    uint num_attribs;
  49    uint semantic_names[2 + MAX_TEXTURE_UNITS];
  50    uint semantic_indexes[2 + MAX_TEXTURE_UNITS];
  51 };
  52
  53 #define MAX_SHADERS (2 * MAX_TEXTURE_UNITS)
  54
  55 /**
  56  * Simple linear list cache.
  57  * Most of the time there'll only be one cached shader.
  58  */
  59 static struct cached_shader CachedShaders[MAX_SHADERS];
  60 static GLuint NumCachedShaders = 0;
  61
  62
  63 #if FEATURE_OES_draw_texture
  64
  65
  66 static void *
  67 lookup_shader(struct pipe_context *pipe,
  68               uint num_attribs,
  69               const uint *semantic_names,
  70               const uint *semantic_indexes)
  71 {
  72    GLuint i, j;
  73
  74    /* look for existing shader with same attributes */
  75    for (i = 0; i < NumCachedShaders; i++) {
  76       if (CachedShaders[i].num_attribs == num_attribs) {
  77          GLboolean match = GL_TRUE;
  78          for (j = 0; j < num_attribs; j++) {
  79             if (semantic_names[j] != CachedShaders[i].semantic_names[j] ||
  80                 semantic_indexes[j] != CachedShaders[i].semantic_indexes[j]) {
  81                match = GL_FALSE;
  82                break;
  83             }
  84          }
  85          if (match)
  86             return CachedShaders[i].handle;
  87       }
  88    }
  89
  90    /* not found - create new one now */
  91    if (NumCachedShaders >= MAX_SHADERS) {
  92       return NULL;
  93    }
  94
  95    CachedShaders[i].num_attribs = num_attribs;
  96    for (j = 0; j < num_attribs; j++) {
  97       CachedShaders[i].semantic_names[j] = semantic_names[j];
  98       CachedShaders[i].semantic_indexes[j] = semantic_indexes[j];
  99    }
 100
 101    CachedShaders[i].handle =
 102       util_make_vertex_passthrough_shader(pipe,
 103                                           num_attribs,
 104                                           semantic_names,
 105                                           semantic_indexes);
 106    NumCachedShaders++;
 107
 108    return CachedShaders[i].handle;
 109 }
 110
 111 static void
 112 st_DrawTex(GLcontext *ctx, GLfloat x, GLfloat y, GLfloat z,
 113            GLfloat width, GLfloat height)
 114 {
 115    struct st_context *st = ctx->st;
 116    struct pipe_context *pipe = st->pipe;
 117    struct cso_context *cso = ctx->st->cso_context;
 118    struct pipe_resource *vbuffer;
 119    struct pipe_transfer *vbuffer_transfer;
 120    GLuint i, numTexCoords, numAttribs;
 121    GLboolean emitColor;
 122    uint semantic_names[2 + MAX_TEXTURE_UNITS];
 123    uint semantic_indexes[2 + MAX_TEXTURE_UNITS];
 124    struct pipe_vertex_element velements[2 + MAX_TEXTURE_UNITS];
 125    GLbitfield inputs = VERT_BIT_POS;
 126
 127    st_validate_state(st);
 128
 129    /* determine if we need vertex color */
 130    if (ctx->FragmentProgram._Current->Base.InputsRead & FRAG_BIT_COL0)
 131       emitColor = GL_TRUE;
 132    else
 133       emitColor = GL_FALSE;
 134
 135    /* determine how many enabled sets of texcoords */
 136    numTexCoords = 0;
 137    for (i = 0; i < ctx->Const.MaxTextureUnits; i++) {
 138       if (ctx->Texture.Unit[i]._ReallyEnabled & TEXTURE_2D_BIT) {
 139          inputs |= VERT_BIT_TEX(i);
 140          numTexCoords++;
 141       }
 142    }
 143
 144    /* total number of attributes per vertex */
 145    numAttribs = 1 + emitColor + numTexCoords;
 146
 147
 148    /* create the vertex buffer */
 149    vbuffer = pipe_buffer_create(pipe->screen, PIPE_BIND_VERTEX_BUFFER,
 150                                 numAttribs * 4 * 4 * sizeof(GLfloat));
 151
 152    /* load vertex buffer */
 153    {
 154 #define SET_ATTRIB(VERT, ATTR, X, Y, Z, W)                              \
 155       do {                                                              \
 156          GLuint k = (((VERT) * numAttribs + (ATTR)) * 4);               \
 157          assert(k < 4 * 4 * numAttribs);                                \
 158          vbuf[k + 0] = X;                                               \
 159          vbuf[k + 1] = Y;                                               \
 160          vbuf[k + 2] = Z;                                               \
 161          vbuf[k + 3] = W;                                               \
 162       } while (0)
 163
 164       const GLfloat x0 = x, y0 = y, x1 = x + width, y1 = y + height;
 165       GLfloat *vbuf = (GLfloat *) pipe_buffer_map(pipe, vbuffer,
 166                                                   PIPE_TRANSFER_WRITE,
 167                                                   &vbuffer_transfer);
 168       GLuint attr;
 169
 170       z = CLAMP(z, 0.0f, 1.0f);
 171
 172       /* positions (in clip coords) */
 173       {
 174          const struct gl_framebuffer *fb = st->ctx->DrawBuffer;
 175          const GLfloat fb_width = (GLfloat)fb->Width;
 176          const GLfloat fb_height = (GLfloat)fb->Height;
 177
 178          const GLfloat clip_x0 = (GLfloat)(x0 / fb_width * 2.0 - 1.0);
 179          const GLfloat clip_y0 = (GLfloat)(y0 / fb_height * 2.0 - 1.0);
 180          const GLfloat clip_x1 = (GLfloat)(x1 / fb_width * 2.0 - 1.0);
 181          const GLfloat clip_y1 = (GLfloat)(y1 / fb_height * 2.0 - 1.0);
 182
 183          SET_ATTRIB(0, 0, clip_x0, clip_y0, z, 1.0f);   /* lower left */
 184          SET_ATTRIB(1, 0, clip_x1, clip_y0, z, 1.0f);   /* lower right */
 185          SET_ATTRIB(2, 0, clip_x1, clip_y1, z, 1.0f);   /* upper right */
 186          SET_ATTRIB(3, 0, clip_x0, clip_y1, z, 1.0f);   /* upper left */
 187
 188          semantic_names[0] = TGSI_SEMANTIC_POSITION;
 189          semantic_indexes[0] = 0;
 190       }
 191
 192       /* colors */
 193       if (emitColor) {
 194          const GLfloat *c = ctx->Current.Attrib[VERT_ATTRIB_COLOR0];
 195          SET_ATTRIB(0, 1, c[0], c[1], c[2], c[3]);
 196          SET_ATTRIB(1, 1, c[0], c[1], c[2], c[3]);
 197          SET_ATTRIB(2, 1, c[0], c[1], c[2], c[3]);
 198          SET_ATTRIB(3, 1, c[0], c[1], c[2], c[3]);
 199          semantic_names[1] = TGSI_SEMANTIC_COLOR;
 200          semantic_indexes[1] = 0;
 201          attr = 2;
 202       }
 203       else {
 204          attr = 1;
 205       }
 206
 207       /* texcoords */
 208       for (i = 0; i < ctx->Const.MaxTextureUnits; i++) {
 209          if (ctx->Texture.Unit[i]._ReallyEnabled & TEXTURE_2D_BIT) {
 210             struct gl_texture_object *obj = ctx->Texture.Unit[i]._Current;
 211             struct gl_texture_image *img = obj->Image[0][obj->BaseLevel];
 212             const GLfloat wt = (GLfloat) img->Width;
 213             const GLfloat ht = (GLfloat) img->Height;
 214             const GLfloat s0 = obj->CropRect[0] / wt;
 215             const GLfloat t0 = obj->CropRect[1] / ht;
 216             const GLfloat s1 = (obj->CropRect[0] + obj->CropRect[2]) / wt;
 217             const GLfloat t1 = (obj->CropRect[1] + obj->CropRect[3]) / ht;
 218
 219             /*printf("crop texcoords: %g, %g .. %g, %g\n", s0, t0, s1, t1);*/
 220             SET_ATTRIB(0, attr, s0, t0, 0.0f, 1.0f);  /* lower left */
 221             SET_ATTRIB(1, attr, s1, t0, 0.0f, 1.0f);  /* lower right */
 222             SET_ATTRIB(2, attr, s1, t1, 0.0f, 1.0f);  /* upper right */
 223             SET_ATTRIB(3, attr, s0, t1, 0.0f, 1.0f);  /* upper left */
 224
 225             semantic_names[attr] = TGSI_SEMANTIC_GENERIC;
 226             semantic_indexes[attr] = 0;
 227
 228             attr++;
 229          }
 230       }
 231
 232       pipe_buffer_unmap(pipe, vbuffer, vbuffer_transfer);
 233
 234 #undef SET_ATTRIB
 235    }
 236
 237
 238    cso_save_viewport(cso);
 239    cso_save_vertex_shader(cso);
 240    cso_save_vertex_elements(cso);
 241
 242    {
 243       void *vs = lookup_shader(pipe, numAttribs,
 244                                semantic_names, semantic_indexes);
 245       cso_set_vertex_shader_handle(cso, vs);
 246    }
 247
 248    for (i = 0; i < numAttribs; i++) {
 249       velements[i].src_offset = i * 4 * sizeof(float);
 250       velements[i].instance_divisor = 0;
 251       velements[i].vertex_buffer_index = 0;
 252       velements[i].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
 253    }
 254    cso_set_vertex_elements(cso, numAttribs, velements);
 255
 256    /* viewport state: viewport matching window dims */
 257    {
 258       const struct gl_framebuffer *fb = st->ctx->DrawBuffer;
 259       const GLboolean invert = (st_fb_orientation(fb) == Y_0_TOP);
 260       const GLfloat width = (GLfloat)fb->Width;
 261       const GLfloat height = (GLfloat)fb->Height;
 262       struct pipe_viewport_state vp;
 263       vp.scale[0] =  0.5f * width;
 264       vp.scale[1] = height * (invert ? -0.5f : 0.5f);
 265       vp.scale[2] = 1.0f;
 266       vp.scale[3] = 1.0f;
 267       vp.translate[0] = 0.5f * width;
 268       vp.translate[1] = 0.5f * height;
 269       vp.translate[2] = 0.0f;
 270       vp.translate[3] = 0.0f;
 271       cso_set_viewport(cso, &vp);
 272    }
 273
 274
 275    util_draw_vertex_buffer(pipe, vbuffer,
 276                            0,  /* offset */
 277                            PIPE_PRIM_TRIANGLE_FAN,
 278                            4,  /* verts */
 279                            numAttribs); /* attribs/vert */
 280
 281
 282    pipe_resource_reference(&vbuffer, NULL);
 283
 284    /* restore state */
 285    cso_restore_viewport(cso);
 286    cso_restore_vertex_shader(cso);
 287    cso_restore_vertex_elements(cso);
 288 }
 289
 290
 291 #endif /* FEATURE_OES_draw_texture */
 292
 293
 294 void
 295 st_init_drawtex_functions(struct dd_function_table *functions)
 296 {
 297    _MESA_INIT_DRAWTEX_FUNCTIONS(functions, st_);
 298 }
 299
 300
 301 /**
 302  * Free any cached shaders
 303  */
 304 void
 305 st_destroy_drawtex(struct st_context *st)
 306 {
 307    GLuint i;
 308    for (i = 0; i < NumCachedShaders; i++) {
 309       cso_delete_vertex_shader(st->cso_context, CachedShaders[i].handle);
 310    }
 311    NumCachedShaders = 0;
 312 }