src/mesa/state_tracker/st_pbo.c

   1 /*
   2  * Copyright 2007 VMware, Inc.
   3  * Copyright 2016 Advanced Micro Devices, Inc.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * on the rights to use, copy, modify, merge, publish, distribute, sub
   9  * license, and/or sell copies of the Software, and to permit persons to whom
  10  * the Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the next
  13  * paragraph) shall be included in all copies or substantial portions of the
  14  * Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHOR(S) AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
  20  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  21  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  22  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25 /**
  26  * \file
  27  *
  28  * Common helper functions for PBO up- and downloads.
  29  */
  30
  31 #include "state_tracker/st_context.h"
  32 #include "state_tracker/st_pbo.h"
  33
  34 #include "pipe/p_context.h"
  35 #include "pipe/p_defines.h"
  36 #include "pipe/p_screen.h"
  37 #include "cso_cache/cso_context.h"
  38 #include "tgsi/tgsi_ureg.h"
  39
  40 void *
  41 st_pbo_create_vs(struct st_context *st)
  42 {
  43    struct ureg_program *ureg;
  44    struct ureg_src in_pos;
  45    struct ureg_src in_instanceid;
  46    struct ureg_dst out_pos;
  47    struct ureg_dst out_layer;
  48
  49    ureg = ureg_create(PIPE_SHADER_VERTEX);
  50    if (!ureg)
  51       return NULL;
  52
  53    in_pos = ureg_DECL_vs_input(ureg, TGSI_SEMANTIC_POSITION);
  54
  55    out_pos = ureg_DECL_output(ureg, TGSI_SEMANTIC_POSITION, 0);
  56
  57    if (st->pbo_upload.upload_layers) {
  58       in_instanceid = ureg_DECL_system_value(ureg, TGSI_SEMANTIC_INSTANCEID, 0);
  59
  60       if (!st->pbo_upload.use_gs)
  61          out_layer = ureg_DECL_output(ureg, TGSI_SEMANTIC_LAYER, 0);
  62    }
  63
  64    /* out_pos = in_pos */
  65    ureg_MOV(ureg, out_pos, in_pos);
  66
  67    if (st->pbo_upload.upload_layers) {
  68       if (st->pbo_upload.use_gs) {
  69          /* out_pos.z = i2f(gl_InstanceID) */
  70          ureg_I2F(ureg, ureg_writemask(out_pos, TGSI_WRITEMASK_Z),
  71                         ureg_scalar(in_instanceid, TGSI_SWIZZLE_X));
  72       } else {
  73          /* out_layer = gl_InstanceID */
  74          ureg_MOV(ureg, out_layer, in_instanceid);
  75       }
  76    }
  77
  78    ureg_END(ureg);
  79
  80    return ureg_create_shader_and_destroy(ureg, st->pipe);
  81 }
  82
  83 void *
  84 st_pbo_create_gs(struct st_context *st)
  85 {
  86    static const int zero = 0;
  87    struct ureg_program *ureg;
  88    struct ureg_dst out_pos;
  89    struct ureg_dst out_layer;
  90    struct ureg_src in_pos;
  91    struct ureg_src imm;
  92    unsigned i;
  93
  94    ureg = ureg_create(PIPE_SHADER_GEOMETRY);
  95    if (!ureg)
  96       return NULL;
  97
  98    ureg_property(ureg, TGSI_PROPERTY_GS_INPUT_PRIM, PIPE_PRIM_TRIANGLES);
  99    ureg_property(ureg, TGSI_PROPERTY_GS_OUTPUT_PRIM, PIPE_PRIM_TRIANGLE_STRIP);
 100    ureg_property(ureg, TGSI_PROPERTY_GS_MAX_OUTPUT_VERTICES, 3);
 101
 102    out_pos = ureg_DECL_output(ureg, TGSI_SEMANTIC_POSITION, 0);
 103    out_layer = ureg_DECL_output(ureg, TGSI_SEMANTIC_LAYER, 0);
 104
 105    in_pos = ureg_DECL_input(ureg, TGSI_SEMANTIC_POSITION, 0, 0, 1);
 106
 107    imm = ureg_DECL_immediate_int(ureg, &zero, 1);
 108
 109    for (i = 0; i < 3; ++i) {
 110       struct ureg_src in_pos_vertex = ureg_src_dimension(in_pos, i);
 111
 112       /* out_pos = in_pos[i] */
 113       ureg_MOV(ureg, out_pos, in_pos_vertex);
 114
 115       /* out_layer.x = f2i(in_pos[i].z) */
 116       ureg_F2I(ureg, ureg_writemask(out_layer, TGSI_WRITEMASK_X),
 117                      ureg_scalar(in_pos_vertex, TGSI_SWIZZLE_Z));
 118
 119       ureg_EMIT(ureg, ureg_scalar(imm, TGSI_SWIZZLE_X));
 120    }
 121
 122    ureg_END(ureg);
 123
 124    return ureg_create_shader_and_destroy(ureg, st->pipe);
 125 }
 126
 127 void
 128 st_init_pbo_helpers(struct st_context *st)
 129 {
 130    struct pipe_context *pipe = st->pipe;
 131    struct pipe_screen *screen = pipe->screen;
 132
 133    st->pbo_upload.enabled =
 134       screen->get_param(screen, PIPE_CAP_TEXTURE_BUFFER_OBJECTS) &&
 135       screen->get_param(screen, PIPE_CAP_TEXTURE_BUFFER_OFFSET_ALIGNMENT) >= 1 &&
 136       screen->get_shader_param(screen, PIPE_SHADER_FRAGMENT, PIPE_SHADER_CAP_INTEGERS);
 137    if (!st->pbo_upload.enabled)
 138       return;
 139
 140    st->pbo_upload.rgba_only =
 141       screen->get_param(screen, PIPE_CAP_BUFFER_SAMPLER_VIEW_RGBA_ONLY);
 142
 143    if (screen->get_param(screen, PIPE_CAP_TGSI_INSTANCEID)) {
 144       if (screen->get_param(screen, PIPE_CAP_TGSI_VS_LAYER_VIEWPORT)) {
 145          st->pbo_upload.upload_layers = true;
 146       } else if (screen->get_param(screen, PIPE_CAP_MAX_GEOMETRY_OUTPUT_VERTICES) >= 3) {
 147          st->pbo_upload.upload_layers = true;
 148          st->pbo_upload.use_gs = true;
 149       }
 150    }
 151
 152    /* Blend state */
 153    memset(&st->pbo_upload.blend, 0, sizeof(struct pipe_blend_state));
 154    st->pbo_upload.blend.rt[0].colormask = PIPE_MASK_RGBA;
 155
 156    /* Rasterizer state */
 157    memset(&st->pbo_upload.raster, 0, sizeof(struct pipe_rasterizer_state));
 158    st->pbo_upload.raster.half_pixel_center = 1;
 159 }
 160
 161 void
 162 st_destroy_pbo_helpers(struct st_context *st)
 163 {
 164    if (st->pbo_upload.fs) {
 165       cso_delete_fragment_shader(st->cso_context, st->pbo_upload.fs);
 166       st->pbo_upload.fs = NULL;
 167    }
 168
 169    if (st->pbo_upload.gs) {
 170       cso_delete_geometry_shader(st->cso_context, st->pbo_upload.gs);
 171       st->pbo_upload.gs = NULL;
 172    }
 173
 174    if (st->pbo_upload.vs) {
 175       cso_delete_vertex_shader(st->cso_context, st->pbo_upload.vs);
 176       st->pbo_upload.vs = NULL;
 177    }
 178 }