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