src/gallium/state_trackers/vega/shader.c

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   3  * Copyright 2009 VMware, Inc.  All Rights Reserved.
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  11  * the following conditions:
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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
  35 #include "pipe/p_context.h"
  36 #include "pipe/p_screen.h"
  37 #include "pipe/p_state.h"
  38 #include "util/u_inlines.h"
  39 #include "util/u_memory.h"
  40
  41 #define MAX_CONSTANTS 20
  42
  43 struct shader {
  44    struct vg_context *context;
  45
  46    VGboolean masking;
  47    struct vg_paint *paint;
  48    struct vg_image *image;
  49
  50    VGboolean drawing_image;
  51    VGImageMode image_mode;
  52
  53    float constants[MAX_CONSTANTS];
  54    struct pipe_buffer *cbuf;
  55    struct pipe_shader_state fs_state;
  56    void *fs;
  57 };
  58
  59 struct shader * shader_create(struct vg_context *ctx)
  60 {
  61    struct shader *shader = 0;
  62
  63    shader = CALLOC_STRUCT(shader);
  64    shader->context = ctx;
  65
  66    return shader;
  67 }
  68
  69 void shader_destroy(struct shader *shader)
  70 {
  71    free(shader);
  72 }
  73
  74 void shader_set_masking(struct shader *shader, VGboolean set)
  75 {
  76    shader->masking = set;
  77 }
  78
  79 VGboolean shader_is_masking(struct shader *shader)
  80 {
  81    return shader->masking;
  82 }
  83
  84 void shader_set_paint(struct shader *shader, struct vg_paint *paint)
  85 {
  86    shader->paint = paint;
  87 }
  88
  89 struct vg_paint * shader_paint(struct shader *shader)
  90 {
  91    return shader->paint;
  92 }
  93
  94
  95 static void setup_constant_buffer(struct shader *shader)
  96 {
  97    struct vg_context *ctx = shader->context;
  98    struct pipe_context *pipe = shader->context->pipe;
  99    struct pipe_buffer **cbuf = &shader->cbuf;
 100    VGint param_bytes = paint_constant_buffer_size(shader->paint);
 101    float temp_buf[MAX_CONSTANTS];
 102
 103    assert(param_bytes <= sizeof(temp_buf));
 104    paint_fill_constant_buffer(shader->paint, temp_buf);
 105
 106    if (*cbuf == NULL ||
 107        memcmp(temp_buf, shader->constants, param_bytes) != 0)
 108    {
 109       pipe_buffer_reference(cbuf, NULL);
 110
 111       memcpy(shader->constants, temp_buf, param_bytes);
 112       *cbuf = pipe_user_buffer_create(pipe->screen,
 113                                       &shader->constants,
 114                                       sizeof(shader->constants));
 115    }
 116
 117    ctx->pipe->set_constant_buffer(ctx->pipe, PIPE_SHADER_FRAGMENT, 0, *cbuf);
 118 }
 119
 120 static VGint blend_bind_samplers(struct vg_context *ctx,
 121                                  struct pipe_sampler_state **samplers,
 122                                  struct pipe_sampler_view **sampler_views)
 123 {
 124    VGBlendMode bmode = ctx->state.vg.blend_mode;
 125
 126    if (bmode == VG_BLEND_MULTIPLY ||
 127        bmode == VG_BLEND_SCREEN ||
 128        bmode == VG_BLEND_DARKEN ||
 129        bmode == VG_BLEND_LIGHTEN) {
 130       struct st_framebuffer *stfb = ctx->draw_buffer;
 131
 132       vg_prepare_blend_surface(ctx);
 133
 134       samplers[2] = &ctx->blend_sampler;
 135       sampler_views[2] = stfb->blend_texture_view;
 136
 137       if (!samplers[0] || !sampler_views[0]) {
 138          samplers[0] = samplers[2];
 139          sampler_views[0] = sampler_views[2];
 140       }
 141       if (!samplers[1] || !sampler_views[1]) {
 142          samplers[1] = samplers[0];
 143          sampler_views[1] = sampler_views[0];
 144       }
 145
 146       return 1;
 147    }
 148    return 0;
 149 }
 150
 151 static void setup_samplers(struct shader *shader)
 152 {
 153    struct pipe_sampler_state *samplers[PIPE_MAX_SAMPLERS];
 154    struct pipe_sampler_view *sampler_views[PIPE_MAX_SAMPLERS];
 155    struct vg_context *ctx = shader->context;
 156    /* a little wonky: we use the num as a boolean that just says
 157     * whether any sampler/textures have been set. the actual numbering
 158     * for samplers is always the same:
 159     * 0 - paint sampler/texture for gradient/pattern
 160     * 1 - mask sampler/texture
 161     * 2 - blend sampler/texture
 162     * 3 - image sampler/texture
 163     * */
 164    VGint num = 0;
 165
 166    samplers[0] = NULL;
 167    samplers[1] = NULL;
 168    samplers[2] = NULL;
 169    samplers[3] = NULL;
 170    sampler_views[0] = NULL;
 171    sampler_views[1] = NULL;
 172    sampler_views[2] = NULL;
 173    sampler_views[3] = NULL;
 174
 175    num += paint_bind_samplers(shader->paint, samplers, sampler_views);
 176    num += mask_bind_samplers(samplers, sampler_views);
 177    num += blend_bind_samplers(ctx, samplers, sampler_views);
 178    if (shader->drawing_image && shader->image)
 179       num += image_bind_samplers(shader->image, samplers, sampler_views);
 180
 181    if (num) {
 182       cso_set_samplers(ctx->cso_context, 4, (const struct pipe_sampler_state **)samplers);
 183       cso_set_fragment_sampler_views(ctx->cso_context, 4, sampler_views);
 184    }
 185 }
 186
 187 static INLINE VGboolean is_format_bw(struct shader *shader)
 188 {
 189 #if 0
 190    struct vg_context *ctx = shader->context;
 191    struct st_framebuffer *stfb = ctx->draw_buffer;
 192 #endif
 193
 194    if (shader->drawing_image && shader->image) {
 195       if (shader->image->format == VG_BW_1)
 196          return VG_TRUE;
 197    }
 198
 199    return VG_FALSE;
 200 }
 201
 202 static void setup_shader_program(struct shader *shader)
 203 {
 204    struct vg_context *ctx = shader->context;
 205    VGint shader_id = 0;
 206    VGBlendMode blend_mode = ctx->state.vg.blend_mode;
 207    VGboolean black_white = is_format_bw(shader);
 208
 209    /* 1st stage: fill */
 210    if (!shader->drawing_image ||
 211        (shader->image_mode == VG_DRAW_IMAGE_MULTIPLY || shader->image_mode == VG_DRAW_IMAGE_STENCIL)) {
 212       switch(paint_type(shader->paint)) {
 213       case VG_PAINT_TYPE_COLOR:
 214          shader_id |= VEGA_SOLID_FILL_SHADER;
 215          break;
 216       case VG_PAINT_TYPE_LINEAR_GRADIENT:
 217          shader_id |= VEGA_LINEAR_GRADIENT_SHADER;
 218          break;
 219       case VG_PAINT_TYPE_RADIAL_GRADIENT:
 220          shader_id |= VEGA_RADIAL_GRADIENT_SHADER;
 221          break;
 222       case VG_PAINT_TYPE_PATTERN:
 223          shader_id |= VEGA_PATTERN_SHADER;
 224          break;
 225
 226       default:
 227          abort();
 228       }
 229    }
 230
 231    /* second stage image */
 232    if (shader->drawing_image) {
 233       switch(shader->image_mode) {
 234       case VG_DRAW_IMAGE_NORMAL:
 235          shader_id |= VEGA_IMAGE_NORMAL_SHADER;
 236          break;
 237       case VG_DRAW_IMAGE_MULTIPLY:
 238          shader_id |= VEGA_IMAGE_MULTIPLY_SHADER;
 239          break;
 240       case VG_DRAW_IMAGE_STENCIL:
 241          shader_id |= VEGA_IMAGE_STENCIL_SHADER;
 242          break;
 243       default:
 244          debug_printf("Unknown image mode!");
 245       }
 246    }
 247
 248    if (shader->masking)
 249       shader_id |= VEGA_MASK_SHADER;
 250
 251    switch(blend_mode) {
 252    case VG_BLEND_MULTIPLY:
 253       shader_id |= VEGA_BLEND_MULTIPLY_SHADER;
 254       break;
 255    case VG_BLEND_SCREEN:
 256       shader_id |= VEGA_BLEND_SCREEN_SHADER;
 257       break;
 258    case VG_BLEND_DARKEN:
 259       shader_id |= VEGA_BLEND_DARKEN_SHADER;
 260       break;
 261    case VG_BLEND_LIGHTEN:
 262       shader_id |= VEGA_BLEND_LIGHTEN_SHADER;
 263       break;
 264    default:
 265       /* handled by pipe_blend_state */
 266       break;
 267    }
 268
 269    if (black_white)
 270       shader_id |= VEGA_BW_SHADER;
 271
 272    shader->fs = shaders_cache_fill(ctx->sc, shader_id);
 273    cso_set_fragment_shader_handle(ctx->cso_context, shader->fs);
 274 }
 275
 276
 277 void shader_bind(struct shader *shader)
 278 {
 279    /* first resolve the real paint type */
 280    paint_resolve_type(shader->paint);
 281
 282    setup_constant_buffer(shader);
 283    setup_samplers(shader);
 284    setup_shader_program(shader);
 285 }
 286
 287 void shader_set_image_mode(struct shader *shader, VGImageMode image_mode)
 288 {
 289    shader->image_mode = image_mode;
 290 }
 291
 292 VGImageMode shader_image_mode(struct shader *shader)
 293 {
 294    return shader->image_mode;
 295 }
 296
 297 void shader_set_drawing_image(struct shader *shader, VGboolean drawing_image)
 298 {
 299    shader->drawing_image = drawing_image;
 300 }
 301
 302 VGboolean shader_drawing_image(struct shader *shader)
 303 {
 304    return shader->drawing_image;
 305 }
 306
 307 void shader_set_image(struct shader *shader, struct vg_image *img)
 308 {
 309    shader->image = img;
 310 }