src/gallium/drivers/panfrost/pan_wallpaper.c

   1 /*
   2  * © Copyright 2018 Alyssa Rosenzweig
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  20  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  21  * SOFTWARE.
  22  *
  23  */
  24
  25 #include "pan_wallpaper.h"
  26 #include "pan_context.h"
  27 #include "pan_screen.h"
  28 #include "pan_util.h"
  29 //#include "include/panfrost-job.h"
  30 #include "midgard/midgard_compile.h"
  31 #include "compiler/nir/nir_builder.h"
  32
  33 /* Creates the special-purpose fragment shader for wallpapering. A
  34  * pseudo-vertex shader sets us up for a fullscreen quad render, with a texture
  35  * coordinate varying */
  36
  37 static nir_shader *
  38 panfrost_build_wallpaper_program()
  39 {
  40         nir_shader *shader = nir_shader_create(NULL, MESA_SHADER_FRAGMENT, &midgard_nir_options, NULL);
  41         nir_function *fn = nir_function_create(shader, "main");
  42         nir_function_impl *impl = nir_function_impl_create(fn);
  43
  44         /* Create the variables variables */
  45
  46         nir_variable *c_texcoord = nir_variable_create(shader, nir_var_shader_in, glsl_vector_type(GLSL_TYPE_FLOAT, 4), "gl_TexCoord");
  47         nir_variable *c_out = nir_variable_create(shader, nir_var_shader_out, glsl_vector_type(GLSL_TYPE_FLOAT, 4), "gl_FragColor");
  48
  49         c_texcoord->data.location = VARYING_SLOT_VAR0;
  50         c_out->data.location = FRAG_RESULT_COLOR;
  51
  52         /* Setup nir_builder */
  53
  54         nir_builder _b;
  55         nir_builder *b = &_b;
  56         nir_builder_init(b, impl);
  57         b->cursor = nir_before_block(nir_start_block(impl));
  58
  59         /* Setup inputs */
  60
  61         nir_ssa_def *s_src = nir_load_var(b, c_texcoord);
  62
  63         /* Build the passthrough texture shader */
  64
  65         nir_tex_instr *tx = nir_tex_instr_create(shader, 1);
  66         tx->op = nir_texop_tex;
  67         tx->texture_index = tx->sampler_index = 0;
  68         tx->sampler_dim = GLSL_SAMPLER_DIM_2D;
  69         tx->dest_type = nir_type_float;
  70
  71         nir_src src = nir_src_for_ssa(s_src);
  72         nir_src_copy(&tx->src[0].src, &src, tx);
  73         tx->src[0].src_type = nir_tex_src_coord;
  74
  75         nir_ssa_dest_init(&tx->instr, &tx->dest, nir_tex_instr_dest_size(tx), 32, NULL);
  76         nir_builder_instr_insert(b, &tx->instr);
  77
  78         nir_ssa_def *texel = &tx->dest.ssa;
  79
  80         nir_store_var(b, c_out, texel, 0xFF);
  81
  82         if (pan_debug & PAN_DBG_SHADERS)
  83                 nir_print_shader(shader, stdout);
  84
  85         return shader;
  86 }
  87
  88 /* Creates the CSO corresponding to the wallpaper program */
  89
  90 static struct panfrost_shader_variants *
  91 panfrost_create_wallpaper_program(struct pipe_context *pctx)
  92 {
  93         nir_shader *built_nir_shader = panfrost_build_wallpaper_program();
  94
  95         struct pipe_shader_state so = {
  96                 .type = PIPE_SHADER_IR_NIR,
  97                 .ir = {
  98                         .nir = built_nir_shader
  99                 }
 100         };
 101
 102         return pctx->create_fs_state(pctx, &so);
 103 }
 104
 105 static struct panfrost_shader_variants *wallpaper_program = NULL;
 106 static struct panfrost_shader_variants *wallpaper_saved_program = NULL;
 107
 108 static void
 109 panfrost_enable_wallpaper_program(struct pipe_context *pctx)
 110 {
 111         struct panfrost_context *ctx = pan_context(pctx);
 112
 113         if (!wallpaper_program) {
 114                 wallpaper_program = panfrost_create_wallpaper_program(pctx);
 115         }
 116
 117         /* Push the shader state */
 118         wallpaper_saved_program = ctx->fs;
 119
 120         /* Bind the program */
 121         pctx->bind_fs_state(pctx, wallpaper_program);
 122 }
 123
 124 static void
 125 panfrost_disable_wallpaper_program(struct pipe_context *pctx)
 126 {
 127         /* Pop off the shader state */
 128         pctx->bind_fs_state(pctx, wallpaper_saved_program);
 129 }
 130
 131 /* Essentially, we insert a fullscreen textured quad, reading from the
 132  * previous frame's framebuffer */
 133
 134 void
 135 panfrost_draw_wallpaper(struct pipe_context *pipe)
 136 {
 137         /* Disable wallpapering for now, but still exercise the shader generation to minimise bit rot */
 138
 139         panfrost_enable_wallpaper_program(pipe);
 140         panfrost_disable_wallpaper_program(pipe);
 141
 142         return;
 143
 144 #if 0
 145         struct panfrost_context *ctx = pan_context(pipe);
 146
 147         /* Setup payload for elided quad. TODO: Refactor draw_vbo so this can
 148          * be a little more DRY */
 149
 150         ctx->payload_tiler.draw_start = 0;
 151         ctx->payload_tiler.prefix.draw_mode = MALI_TRIANGLE_STRIP;
 152         ctx->vertex_count = 4;
 153         ctx->payload_tiler.prefix.invocation_count = MALI_POSITIVE(4);
 154         ctx->payload_tiler.prefix.unknown_draw &= ~(0x3000 | 0x18000);
 155         ctx->payload_tiler.prefix.unknown_draw |= 0x18000;
 156         ctx->payload_tiler.prefix.negative_start = 0;
 157         ctx->payload_tiler.prefix.index_count = MALI_POSITIVE(4);
 158         ctx->payload_tiler.prefix.unknown_draw &= ~MALI_DRAW_INDEXED_UINT32;
 159         ctx->payload_tiler.prefix.indices = (uintptr_t) NULL;
 160
 161         /* Setup the wallpapering program. We need to build the program via
 162          * NIR. */
 163
 164         panfrost_enable_wallpaper_program(pipe);
 165
 166         /* Setup the texture/sampler pair */
 167
 168         struct pipe_sampler_view tmpl = {
 169                 .target = PIPE_TEXTURE_2D,
 170                 .swizzle_r = PIPE_SWIZZLE_X,
 171                 .swizzle_g = PIPE_SWIZZLE_Y,
 172                 .swizzle_b = PIPE_SWIZZLE_Z,
 173                 .swizzle_a = PIPE_SWIZZLE_W
 174         };
 175
 176         struct pipe_sampler_state state = {
 177                 .min_mip_filter = PIPE_TEX_MIPFILTER_NONE,
 178                 .min_img_filter = PIPE_TEX_MIPFILTER_LINEAR,
 179                 .mag_img_filter = PIPE_TEX_MIPFILTER_LINEAR,
 180                 .wrap_s = PIPE_TEX_WRAP_CLAMP_TO_EDGE,
 181                 .wrap_t = PIPE_TEX_WRAP_CLAMP_TO_EDGE,
 182                 .wrap_r = PIPE_TEX_WRAP_CLAMP_TO_EDGE,
 183                 .normalized_coords = 1
 184         };
 185
 186         struct pipe_resource *rsrc = pan_screen(pipe->screen)->display_target;
 187         struct pipe_sampler_state *sampler_state = pipe->create_sampler_state(pipe, &state);
 188         struct pipe_sampler_view *sampler_view = pipe->create_sampler_view(pipe, rsrc, &tmpl);
 189
 190         /* Bind texture/sampler. TODO: push/pop */
 191         pipe->bind_sampler_states(pipe, PIPE_SHADER_FRAGMENT, 0, 1, &sampler_state);
 192         pipe->set_sampler_views(pipe, PIPE_SHADER_FRAGMENT, 0, 1, &sampler_view);
 193
 194         panfrost_emit_for_draw(ctx, false);
 195
 196         /* Elision occurs by essential precomputing the results of the
 197          * implied vertex shader. Insert these results for fullscreen. The
 198          * first two channels are ~screenspace coordinates, whereas the latter
 199          * two are fixed 0.0/1.0 after perspective division. See the vertex
 200          * shader epilogue for more context */
 201
 202         float implied_position_varying[] = {
 203                 /* The following is correct for scissored clears whose scissor deals with cutoff appropriately */
 204
 205 //                -1.0, -1.0,        0.0, 1.0,
 206 //                -1.0, 65535.0,     0.0, 1.0,
 207 //                65536.0, 1.0,      0.0, 1.0,
 208 //                65536.0, 65536.0,  0.0, 1.0
 209
 210                 /* The following output is correct for a fullscreen quad with screen size 2048x1600 */
 211                 0.0, 0.0, 0.0, 1.0,
 212                 0.0, 1600.0, 0.0, 1.0,
 213                 2048.0, 0.0, 0.0, 1.0,
 214                 2048.0, 1280.0, 0.0, 1.0,
 215         };
 216
 217         ctx->payload_tiler.postfix.position_varying = panfrost_upload_transient(ctx, implied_position_varying, sizeof(implied_position_varying));
 218
 219         /* Similarly, setup the texture coordinate varying, hardcoded to match
 220          * the corners of the screen */
 221
 222         float texture_coordinates[] = {
 223                 0.0, 0.0, 0.0, 0.0,
 224                 0.0, 1.0, 0.0, 0.0,
 225                 1.0, 0.0, 0.0, 0.0,
 226                 1.0, 1.0, 0.0, 0.0
 227         };
 228
 229         union mali_attr varyings[1] = {
 230                 {
 231                         .elements = panfrost_upload_transient(ctx, texture_coordinates, sizeof(texture_coordinates)) | 1,
 232                         .stride = sizeof(float) * 4,
 233                         .size = sizeof(texture_coordinates)
 234                 }
 235         };
 236
 237         ctx->payload_tiler.postfix.varyings = panfrost_upload_transient(ctx, varyings, sizeof(varyings));
 238
 239         struct mali_attr_meta varying_meta[1] = {
 240                 {
 241                         .type = MALI_ATYPE_FLOAT,
 242                         .nr_components = MALI_POSITIVE(4),
 243                         .not_normalised = 1,
 244                         .unknown1 = /*0x2c22 - nr_comp=2*/ 0x2a22,
 245                         .unknown2 = 0x1
 246                 }
 247         };
 248
 249         mali_ptr saved_varying_meta = ctx->payload_tiler.postfix.varying_meta;
 250         ctx->payload_tiler.postfix.varying_meta = panfrost_upload_transient(ctx, varying_meta, sizeof(varying_meta));
 251
 252         /* Emit the tiler job */
 253         struct panfrost_transfer tiler = panfrost_vertex_tiler_job(ctx, true, true);
 254         struct mali_job_descriptor_header *jd = (struct mali_job_descriptor_header *) tiler.cpu;
 255         ctx->u_tiler_jobs[ctx->tiler_job_count] = jd;
 256         ctx->tiler_jobs[ctx->tiler_job_count++] = tiler.gpu;
 257         ctx->draw_count++;
 258
 259         /* Okay, so we have the tiler job emitted. Since we set elided_tiler
 260          * mode, no dependencies will be set automatically. We don't actually
 261          * want any dependencies, since we go first and we don't need a vertex
 262          * first. That said, we do need the first tiler job to depend on us.
 263          * Its second dep slot will be free (see the panfrost_vertex_tiler_job
 264          * dependency setting algorithm), so fill us in with that
 265          */
 266
 267         if (ctx->tiler_job_count > 1) {
 268                 ctx->u_tiler_jobs[0]->job_dependency_index_2 = jd->job_index;
 269         }
 270
 271         printf("Wallpaper boop\n");
 272
 273         /* Cleanup */
 274         panfrost_disable_wallpaper_program(pipe);
 275         ctx->payload_tiler.postfix.varying_meta = saved_varying_meta;
 276 #endif
 277 }