src/gallium/state_trackers/vega/shader.c

   1 /**************************************************************************
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   3  * Copyright 2009 VMware, Inc.  All Rights Reserved.
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  13  * The above copyright notice and this permission notice (including the
  14  * next paragraph) shall be included in all copies or substantial portions
  15  * of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  19  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
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  25  **************************************************************************/
  26
  27 #include "shader.h"
  28
  29 #include "vg_context.h"
  30 #include "shaders_cache.h"
  31 #include "paint.h"
  32 #include "mask.h"
  33 #include "image.h"
  34 #include "renderer.h"
  35
  36 #include "pipe/p_context.h"
  37 #include "pipe/p_state.h"
  38 #include "util/u_memory.h"
  39 #include "util/u_math.h"
  40 #include "util/u_format.h"
  41
  42 #define MAX_CONSTANTS 28
  43
  44 struct shader {
  45    struct vg_context *context;
  46
  47    VGboolean color_transform;
  48    VGboolean masking;
  49    struct vg_paint *paint;
  50    struct vg_image *image;
  51
  52    struct matrix modelview;
  53    struct matrix paint_matrix;
  54
  55    VGboolean drawing_image;
  56    VGImageMode image_mode;
  57
  58    float constants[MAX_CONSTANTS];
  59    struct pipe_resource *cbuf;
  60    struct pipe_shader_state fs_state;
  61    void *fs;
  62 };
  63
  64 struct shader * shader_create(struct vg_context *ctx)
  65 {
  66    struct shader *shader = 0;
  67
  68    shader = CALLOC_STRUCT(shader);
  69    shader->context = ctx;
  70
  71    return shader;
  72 }
  73
  74 void shader_destroy(struct shader *shader)
  75 {
  76    FREE(shader);
  77 }
  78
  79 void shader_set_color_transform(struct shader *shader, VGboolean set)
  80 {
  81    shader->color_transform = set;
  82 }
  83
  84 void shader_set_masking(struct shader *shader, VGboolean set)
  85 {
  86    shader->masking = set;
  87 }
  88
  89 VGboolean shader_is_masking(struct shader *shader)
  90 {
  91    return shader->masking;
  92 }
  93
  94 void shader_set_paint(struct shader *shader, struct vg_paint *paint)
  95 {
  96    shader->paint = paint;
  97 }
  98
  99 struct vg_paint * shader_paint(struct shader *shader)
 100 {
 101    return shader->paint;
 102 }
 103
 104 static VGint setup_constant_buffer(struct shader *shader)
 105 {
 106    const struct vg_state *state = &shader->context->state.vg;
 107    VGint param_bytes = paint_constant_buffer_size(shader->paint);
 108    VGint i;
 109
 110    param_bytes += sizeof(VGfloat) * 8;
 111    assert(param_bytes <= sizeof(shader->constants));
 112
 113    if (state->color_transform) {
 114       for (i = 0; i < 8; i++) {
 115          VGfloat val = (i < 4) ? 127.0f : 1.0f;
 116          shader->constants[i] =
 117             CLAMP(state->color_transform_values[i], -val, val);
 118       }
 119    }
 120    else {
 121       memset(shader->constants, 0, sizeof(VGfloat) * 8);
 122    }
 123
 124    paint_fill_constant_buffer(shader->paint,
 125          &shader->paint_matrix, shader->constants + 8);
 126
 127    return param_bytes;
 128 }
 129
 130 static VGboolean blend_use_shader(struct vg_context *ctx)
 131 {
 132    VGboolean advanced_blending;
 133
 134    switch (ctx->state.vg.blend_mode) {
 135    case VG_BLEND_SRC_OVER:
 136       advanced_blending =
 137          (!paint_is_opaque(ctx->state.vg.fill_paint) ||
 138           !paint_is_opaque(ctx->state.vg.stroke_paint)) &&
 139          util_format_has_alpha(ctx->draw_buffer->strb->format);
 140       break;
 141    case VG_BLEND_DST_OVER:
 142    case VG_BLEND_MULTIPLY:
 143    case VG_BLEND_SCREEN:
 144    case VG_BLEND_DARKEN:
 145    case VG_BLEND_LIGHTEN:
 146    case VG_BLEND_ADDITIVE:
 147       advanced_blending = VG_TRUE;
 148       break;
 149    default:
 150       advanced_blending = VG_FALSE;
 151       break;
 152    }
 153
 154    return advanced_blending;
 155 }
 156
 157 static VGint blend_bind_samplers(struct vg_context *ctx,
 158                                  struct pipe_sampler_state **samplers,
 159                                  struct pipe_sampler_view **sampler_views)
 160 {
 161    if (blend_use_shader(ctx)) {
 162       samplers[2] = &ctx->blend_sampler;
 163       sampler_views[2] = vg_prepare_blend_surface(ctx);
 164
 165       if (!samplers[0] || !sampler_views[0]) {
 166          samplers[0] = samplers[2];
 167          sampler_views[0] = sampler_views[2];
 168       }
 169       if (!samplers[1] || !sampler_views[1]) {
 170          samplers[1] = samplers[0];
 171          sampler_views[1] = sampler_views[0];
 172       }
 173
 174       return 1;
 175    }
 176    return 0;
 177 }
 178
 179 static VGint setup_samplers(struct shader *shader,
 180                             struct pipe_sampler_state **samplers,
 181                             struct pipe_sampler_view **sampler_views)
 182 {
 183    struct vg_context *ctx = shader->context;
 184    /* a little wonky: we use the num as a boolean that just says
 185     * whether any sampler/textures have been set. the actual numbering
 186     * for samplers is always the same:
 187     * 0 - paint sampler/texture for gradient/pattern
 188     * 1 - mask sampler/texture
 189     * 2 - blend sampler/texture
 190     * 3 - image sampler/texture
 191     * */
 192    VGint num = 0;
 193
 194    samplers[0] = NULL;
 195    samplers[1] = NULL;
 196    samplers[2] = NULL;
 197    samplers[3] = NULL;
 198    sampler_views[0] = NULL;
 199    sampler_views[1] = NULL;
 200    sampler_views[2] = NULL;
 201    sampler_views[3] = NULL;
 202
 203    num += paint_bind_samplers(shader->paint, samplers, sampler_views);
 204    num += mask_bind_samplers(samplers, sampler_views);
 205    num += blend_bind_samplers(ctx, samplers, sampler_views);
 206    if (shader->drawing_image && shader->image)
 207       num += image_bind_samplers(shader->image, samplers, sampler_views);
 208
 209    return (num) ? 4 : 0;
 210 }
 211
 212 static INLINE VGboolean is_format_bw(struct shader *shader)
 213 {
 214 #if 0
 215    struct vg_context *ctx = shader->context;
 216    struct st_framebuffer *stfb = ctx->draw_buffer;
 217 #endif
 218
 219    if (shader->drawing_image && shader->image) {
 220       if (shader->image->format == VG_BW_1)
 221          return VG_TRUE;
 222    }
 223
 224    return VG_FALSE;
 225 }
 226
 227 static void setup_shader_program(struct shader *shader)
 228 {
 229    struct vg_context *ctx = shader->context;
 230    VGint shader_id = 0;
 231    VGBlendMode blend_mode = ctx->state.vg.blend_mode;
 232    VGboolean black_white = is_format_bw(shader);
 233
 234    /* 1st stage: fill */
 235    if (!shader->drawing_image ||
 236        (shader->image_mode == VG_DRAW_IMAGE_MULTIPLY || shader->image_mode == VG_DRAW_IMAGE_STENCIL)) {
 237       switch(paint_type(shader->paint)) {
 238       case VG_PAINT_TYPE_COLOR:
 239          shader_id |= VEGA_SOLID_FILL_SHADER;
 240          break;
 241       case VG_PAINT_TYPE_LINEAR_GRADIENT:
 242          shader_id |= VEGA_LINEAR_GRADIENT_SHADER;
 243          break;
 244       case VG_PAINT_TYPE_RADIAL_GRADIENT:
 245          shader_id |= VEGA_RADIAL_GRADIENT_SHADER;
 246          break;
 247       case VG_PAINT_TYPE_PATTERN:
 248          shader_id |= VEGA_PATTERN_SHADER;
 249          break;
 250
 251       default:
 252          abort();
 253       }
 254
 255       if (paint_is_degenerate(shader->paint))
 256          shader_id = VEGA_PAINT_DEGENERATE_SHADER;
 257    }
 258
 259    /* second stage image */
 260    if (shader->drawing_image) {
 261       switch(shader->image_mode) {
 262       case VG_DRAW_IMAGE_NORMAL:
 263          shader_id |= VEGA_IMAGE_NORMAL_SHADER;
 264          break;
 265       case VG_DRAW_IMAGE_MULTIPLY:
 266          shader_id |= VEGA_IMAGE_MULTIPLY_SHADER;
 267          break;
 268       case VG_DRAW_IMAGE_STENCIL:
 269          shader_id |= VEGA_IMAGE_STENCIL_SHADER;
 270          break;
 271       default:
 272          debug_printf("Unknown image mode!");
 273       }
 274    }
 275
 276    if (shader->color_transform)
 277       shader_id |= VEGA_COLOR_TRANSFORM_SHADER;
 278
 279    if (blend_use_shader(ctx)) {
 280       if (shader->drawing_image && shader->image_mode == VG_DRAW_IMAGE_STENCIL)
 281          shader_id |= VEGA_ALPHA_PER_CHANNEL_SHADER;
 282       else
 283          shader_id |= VEGA_ALPHA_NORMAL_SHADER;
 284
 285       switch(blend_mode) {
 286       case VG_BLEND_SRC:
 287          shader_id |= VEGA_BLEND_SRC_SHADER;
 288          break;
 289       case VG_BLEND_SRC_OVER:
 290          shader_id |= VEGA_BLEND_SRC_OVER_SHADER;
 291          break;
 292       case VG_BLEND_DST_OVER:
 293          shader_id |= VEGA_BLEND_DST_OVER_SHADER;
 294          break;
 295       case VG_BLEND_SRC_IN:
 296          shader_id |= VEGA_BLEND_SRC_IN_SHADER;
 297          break;
 298       case VG_BLEND_DST_IN:
 299          shader_id |= VEGA_BLEND_DST_IN_SHADER;
 300          break;
 301       case VG_BLEND_MULTIPLY:
 302          shader_id |= VEGA_BLEND_MULTIPLY_SHADER;
 303          break;
 304       case VG_BLEND_SCREEN:
 305          shader_id |= VEGA_BLEND_SCREEN_SHADER;
 306          break;
 307       case VG_BLEND_DARKEN:
 308          shader_id |= VEGA_BLEND_DARKEN_SHADER;
 309          break;
 310       case VG_BLEND_LIGHTEN:
 311          shader_id |= VEGA_BLEND_LIGHTEN_SHADER;
 312          break;
 313       case VG_BLEND_ADDITIVE:
 314          shader_id |= VEGA_BLEND_ADDITIVE_SHADER;
 315          break;
 316       default:
 317          assert(0);
 318          break;
 319       }
 320    }
 321    else {
 322       /* update alpha of the source */
 323       if (shader->drawing_image && shader->image_mode == VG_DRAW_IMAGE_STENCIL)
 324          shader_id |= VEGA_ALPHA_PER_CHANNEL_SHADER;
 325    }
 326
 327    if (shader->masking)
 328       shader_id |= VEGA_MASK_SHADER;
 329
 330    if (black_white)
 331       shader_id |= VEGA_BW_SHADER;
 332
 333    shader->fs = shaders_cache_fill(ctx->sc, shader_id);
 334 }
 335
 336
 337 void shader_bind(struct shader *shader)
 338 {
 339    struct vg_context *ctx = shader->context;
 340    struct pipe_sampler_state *samplers[PIPE_MAX_SAMPLERS];
 341    struct pipe_sampler_view *sampler_views[PIPE_MAX_SAMPLERS];
 342    VGint num_samplers, param_bytes;
 343
 344    /* first resolve the real paint type */
 345    paint_resolve_type(shader->paint);
 346
 347    num_samplers = setup_samplers(shader, samplers, sampler_views);
 348    param_bytes = setup_constant_buffer(shader);
 349    setup_shader_program(shader);
 350
 351    renderer_validate_for_shader(ctx->renderer,
 352          (const struct pipe_sampler_state **) samplers,
 353          sampler_views, num_samplers,
 354          &shader->modelview,
 355          shader->fs, (const void *) shader->constants, param_bytes);
 356 }
 357
 358 void shader_set_image_mode(struct shader *shader, VGImageMode image_mode)
 359 {
 360    shader->image_mode = image_mode;
 361 }
 362
 363 VGImageMode shader_image_mode(struct shader *shader)
 364 {
 365    return shader->image_mode;
 366 }
 367
 368 void shader_set_drawing_image(struct shader *shader, VGboolean drawing_image)
 369 {
 370    shader->drawing_image = drawing_image;
 371 }
 372
 373 VGboolean shader_drawing_image(struct shader *shader)
 374 {
 375    return shader->drawing_image;
 376 }
 377
 378 void shader_set_image(struct shader *shader, struct vg_image *img)
 379 {
 380    shader->image = img;
 381 }
 382
 383 /**
 384  * Set the transformation to map a vertex to the surface coordinates.
 385  */
 386 void shader_set_surface_matrix(struct shader *shader,
 387                                const struct matrix *mat)
 388 {
 389    shader->modelview = *mat;
 390 }
 391
 392 /**
 393  * Set the transformation to map a pixel to the paint coordinates.
 394  */
 395 void shader_set_paint_matrix(struct shader *shader, const struct matrix *mat)
 396 {
 397    const struct st_framebuffer *stfb = shader->context->draw_buffer;
 398    const VGfloat px_center_offset = 0.5f;
 399
 400    memcpy(&shader->paint_matrix, mat, sizeof(*mat));
 401
 402    /* make it window-to-paint for the shaders */
 403    matrix_translate(&shader->paint_matrix, px_center_offset,
 404          stfb->height - 1.0f + px_center_offset);
 405    matrix_scale(&shader->paint_matrix, 1.0f, -1.0f);
 406 }