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 "pipe/p_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_buffer *vbuffer;
 119    GLuint i, numTexCoords, numAttribs;
 120    GLboolean emitColor;
 121    uint semantic_names[2 + MAX_TEXTURE_UNITS];
 122    uint semantic_indexes[2 + MAX_TEXTURE_UNITS];
 123    GLbitfield inputs = VERT_BIT_POS;
 124
 125    /* determine if we need vertex color */
 126    if (ctx->FragmentProgram._Current->Base.InputsRead & FRAG_BIT_COL0)
 127       emitColor = GL_TRUE;
 128    else
 129       emitColor = GL_FALSE;
 130
 131    /* determine how many enabled sets of texcoords */
 132    numTexCoords = 0;
 133    for (i = 0; i < ctx->Const.MaxTextureUnits; i++) {
 134       if (ctx->Texture.Unit[i]._ReallyEnabled & TEXTURE_2D_BIT) {
 135          inputs |= VERT_BIT_TEX(i);
 136          numTexCoords++;
 137       }
 138    }
 139
 140    /* total number of attributes per vertex */
 141    numAttribs = 1 + emitColor + numTexCoords;
 142
 143
 144    /* create the vertex buffer */
 145    vbuffer = pipe_buffer_create(pipe->screen, 32, PIPE_BUFFER_USAGE_VERTEX,
 146                                 numAttribs * 4 * 4 * sizeof(GLfloat));
 147
 148    /* load vertex buffer */
 149    {
 150 #define SET_ATTRIB(VERT, ATTR, X, Y, Z, W)                              \
 151       do {                                                              \
 152          GLuint k = (((VERT) * numAttribs + (ATTR)) * 4);               \
 153          assert(k < 4 * 4 * numAttribs);                                \
 154          vbuf[k + 0] = X;                                               \
 155          vbuf[k + 1] = Y;                                               \
 156          vbuf[k + 2] = Z;                                               \
 157          vbuf[k + 3] = W;                                               \
 158       } while (0)
 159
 160       const GLfloat x0 = x, y0 = y, x1 = x + width, y1 = y + height;
 161       GLfloat *vbuf = (GLfloat *) pipe_buffer_map(pipe->screen, vbuffer,
 162                                                   PIPE_BUFFER_USAGE_CPU_WRITE);
 163       GLuint attr;
 164
 165       z = CLAMP(z, 0.0f, 1.0f);
 166
 167       /* positions (in clip coords) */
 168       {
 169          const struct gl_framebuffer *fb = st->ctx->DrawBuffer;
 170          const GLfloat fb_width = (GLfloat)fb->Width;
 171          const GLfloat fb_height = (GLfloat)fb->Height;
 172
 173          const GLfloat clip_x0 = (GLfloat)(x0 / fb_width * 2.0 - 1.0);
 174          const GLfloat clip_y0 = (GLfloat)(y0 / fb_height * 2.0 - 1.0);
 175          const GLfloat clip_x1 = (GLfloat)(x1 / fb_width * 2.0 - 1.0);
 176          const GLfloat clip_y1 = (GLfloat)(y1 / fb_height * 2.0 - 1.0);
 177
 178          SET_ATTRIB(0, 0, clip_x0, clip_y0, z, 1.0f);   /* lower left */
 179          SET_ATTRIB(1, 0, clip_x1, clip_y0, z, 1.0f);   /* lower right */
 180          SET_ATTRIB(2, 0, clip_x1, clip_y1, z, 1.0f);   /* upper right */
 181          SET_ATTRIB(3, 0, clip_x0, clip_y1, z, 1.0f);   /* upper left */
 182
 183          semantic_names[0] = TGSI_SEMANTIC_POSITION;
 184          semantic_indexes[0] = 0;
 185       }
 186
 187       /* colors */
 188       if (emitColor) {
 189          const GLfloat *c = ctx->Current.Attrib[VERT_ATTRIB_COLOR0];
 190          SET_ATTRIB(0, 1, c[0], c[1], c[2], c[3]);
 191          SET_ATTRIB(1, 1, c[0], c[1], c[2], c[3]);
 192          SET_ATTRIB(2, 1, c[0], c[1], c[2], c[3]);
 193          SET_ATTRIB(3, 1, c[0], c[1], c[2], c[3]);
 194          semantic_names[1] = TGSI_SEMANTIC_COLOR;
 195          semantic_indexes[1] = 0;
 196          attr = 2;
 197       }
 198       else {
 199          attr = 1;
 200       }
 201
 202       /* texcoords */
 203       for (i = 0; i < ctx->Const.MaxTextureUnits; i++) {
 204          if (ctx->Texture.Unit[i]._ReallyEnabled & TEXTURE_2D_BIT) {
 205             struct gl_texture_object *obj = ctx->Texture.Unit[i]._Current;
 206             struct gl_texture_image *img = obj->Image[0][obj->BaseLevel];
 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, attr, s0, t0, 0.0f, 1.0f);  /* lower left */
 216             SET_ATTRIB(1, attr, s1, t0, 0.0f, 1.0f);  /* lower right */
 217             SET_ATTRIB(2, attr, s1, t1, 0.0f, 1.0f);  /* upper right */
 218             SET_ATTRIB(3, attr, s0, t1, 0.0f, 1.0f);  /* upper left */
 219
 220             semantic_names[attr] = TGSI_SEMANTIC_GENERIC;
 221             semantic_indexes[attr] = 0;
 222
 223             attr++;
 224          }
 225       }
 226
 227       pipe_buffer_unmap(pipe->screen, vbuffer);
 228
 229 #undef SET_ATTRIB
 230    }
 231
 232
 233    cso_save_viewport(cso);
 234    cso_save_vertex_shader(cso);
 235
 236    {
 237       void *vs = lookup_shader(pipe, numAttribs,
 238                                semantic_names, semantic_indexes);
 239       cso_set_vertex_shader_handle(cso, vs);
 240    }
 241
 242    /* viewport state: viewport matching window dims */
 243    {
 244       const struct gl_framebuffer *fb = st->ctx->DrawBuffer;
 245       const GLboolean invert = (st_fb_orientation(fb) == Y_0_TOP);
 246       const GLfloat width = (GLfloat)fb->Width;
 247       const GLfloat height = (GLfloat)fb->Height;
 248       struct pipe_viewport_state vp;
 249       vp.scale[0] =  0.5f * width;
 250       vp.scale[1] = height * (invert ? -0.5f : 0.5f);
 251       vp.scale[2] = 1.0f;
 252       vp.scale[3] = 1.0f;
 253       vp.translate[0] = 0.5f * width;
 254       vp.translate[1] = 0.5f * height;
 255       vp.translate[2] = 0.0f;
 256       vp.translate[3] = 0.0f;
 257       cso_set_viewport(cso, &vp);
 258    }
 259
 260
 261    util_draw_vertex_buffer(pipe, vbuffer,
 262                            0,  /* offset */
 263                            PIPE_PRIM_TRIANGLE_FAN,
 264                            4,  /* verts */
 265                            numAttribs); /* attribs/vert */
 266
 267
 268    pipe_buffer_reference(&vbuffer, NULL);
 269
 270    /* restore state */
 271    cso_restore_viewport(cso);
 272    cso_restore_vertex_shader(cso);
 273 }
 274
 275
 276 #endif /* FEATURE_OES_draw_texture */
 277
 278
 279 void
 280 st_init_drawtex_functions(struct dd_function_table *functions)
 281 {
 282    _MESA_INIT_DRAWTEX_FUNCTIONS(functions, st_);
 283 }
 284
 285
 286 /**
 287  * Free any cached shaders
 288  */
 289 void
 290 st_destroy_drawtex(struct st_context *st)
 291 {
 292    GLuint i;
 293    for (i = 0; i < NumCachedShaders; i++) {
 294       cso_delete_vertex_shader(st->cso_context, CachedShaders[i].handle);
 295    }
 296    NumCachedShaders = 0;
 297 }