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/*
* Copyright (C) 2018-2019 Alyssa Rosenzweig
* Copyright (C) 2019 Collabora, Ltd.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
*/
#include "pan_context.h"
static mali_ptr
panfrost_emit_varyings(
struct panfrost_context *ctx,
union mali_attr *slot,
unsigned stride,
unsigned count)
{
/* Fill out the descriptor */
slot->stride = stride;
slot->size = stride * count;
slot->shift = slot->extra_flags = 0;
struct panfrost_transfer transfer =
panfrost_allocate_transient(ctx, slot->size);
slot->elements = transfer.gpu | MALI_ATTR_LINEAR;
return transfer.gpu;
}
static void
panfrost_emit_point_coord(union mali_attr *slot)
{
slot->elements = MALI_VARYING_POINT_COORD | MALI_ATTR_LINEAR;
slot->stride = slot->size = slot->shift = slot->extra_flags = 0;
}
static void
panfrost_emit_front_face(union mali_attr *slot)
{
slot->elements = MALI_VARYING_FRONT_FACING | MALI_ATTR_INTERNAL;
}
/* Given a shader and buffer indices, link varying metadata together */
static bool
is_special_varying(gl_varying_slot loc)
{
switch (loc) {
case VARYING_SLOT_POS:
case VARYING_SLOT_PSIZ:
case VARYING_SLOT_PNTC:
case VARYING_SLOT_FACE:
return true;
default:
return false;
}
}
static void
panfrost_emit_varying_meta(
void *outptr, struct panfrost_shader_state *ss,
signed general, signed gl_Position,
signed gl_PointSize, signed gl_PointCoord,
signed gl_FrontFacing)
{
struct mali_attr_meta *out = (struct mali_attr_meta *) outptr;
for (unsigned i = 0; i < ss->tripipe->varying_count; ++i) {
gl_varying_slot location = ss->varyings_loc[i];
int index = -1;
switch (location) {
case VARYING_SLOT_POS:
index = gl_Position;
break;
case VARYING_SLOT_PSIZ:
index = gl_PointSize;
break;
case VARYING_SLOT_PNTC:
index = gl_PointCoord;
break;
case VARYING_SLOT_FACE:
index = gl_FrontFacing;
break;
default:
index = general;
break;
}
assert(index >= 0);
out[i].index = index;
}
}
void
panfrost_emit_varying_descriptor(
struct panfrost_context *ctx,
unsigned vertex_count)
{
/* Load the shaders */
struct panfrost_shader_state *vs = &ctx->shader[PIPE_SHADER_VERTEX]->variants[ctx->shader[PIPE_SHADER_VERTEX]->active_variant];
struct panfrost_shader_state *fs = &ctx->shader[PIPE_SHADER_FRAGMENT]->variants[ctx->shader[PIPE_SHADER_FRAGMENT]->active_variant];
unsigned int num_gen_varyings = 0;
/* Allocate the varying descriptor */
size_t vs_size = sizeof(struct mali_attr_meta) * vs->tripipe->varying_count;
size_t fs_size = sizeof(struct mali_attr_meta) * fs->tripipe->varying_count;
struct panfrost_transfer trans = panfrost_allocate_transient(ctx,
vs_size + fs_size);
for (unsigned i = 0; i < vs->tripipe->varying_count; i++) {
if (!is_special_varying(vs->varyings_loc[i]))
vs->varyings[i].src_offset = 16 * (num_gen_varyings++);
}
for (unsigned i = 0; i < fs->tripipe->varying_count; i++) {
unsigned j;
/* If we have a point sprite replacement, handle that here. We
* have to translate location first. TODO: Flip y in shader.
* We're already keying ... just time crunch .. */
unsigned loc = fs->varyings_loc[i];
unsigned pnt_loc =
(loc >= VARYING_SLOT_TEX0) ? (loc - VARYING_SLOT_TEX0) :
(loc == VARYING_SLOT_PNTC) ? 8 :
~0;
if (~pnt_loc && fs->point_sprite_mask & (1 << pnt_loc)) {
/* gl_PointCoord index by convention */
fs->varyings[i].index = 3;
fs->reads_point_coord = true;
/* Swizzle out the z/w to 0/1 */
fs->varyings[i].format = MALI_RG16F;
fs->varyings[i].swizzle =
panfrost_get_default_swizzle(2);
continue;
}
if (fs->varyings[i].index)
continue;
/*
* Re-use the VS general purpose varying pos if it exists,
* create a new one otherwise.
*/
for (j = 0; j < vs->tripipe->varying_count; j++) {
if (fs->varyings_loc[i] == vs->varyings_loc[j])
break;
}
if (j < vs->tripipe->varying_count)
fs->varyings[i].src_offset = vs->varyings[j].src_offset;
else
fs->varyings[i].src_offset = 16 * (num_gen_varyings++);
}
memcpy(trans.cpu, vs->varyings, vs_size);
memcpy(trans.cpu + vs_size, fs->varyings, fs_size);
union mali_attr varyings[PIPE_MAX_ATTRIBS];
unsigned idx = 0;
signed general = idx++;
signed gl_Position = idx++;
signed gl_PointSize = vs->writes_point_size ? (idx++) : -1;
signed gl_PointCoord = fs->reads_point_coord ? (idx++) : -1;
signed gl_FrontFacing = fs->reads_face ? (idx++) : -1;
panfrost_emit_varyings(ctx, &varyings[general], num_gen_varyings * 16,
vertex_count);
/* fp32 vec4 gl_Position */
ctx->payloads[PIPE_SHADER_FRAGMENT].postfix.position_varying =
panfrost_emit_varyings(ctx, &varyings[gl_Position],
sizeof(float) * 4, vertex_count);
if (vs->writes_point_size)
ctx->payloads[PIPE_SHADER_FRAGMENT].primitive_size.pointer =
panfrost_emit_varyings(ctx, &varyings[gl_PointSize],
2, vertex_count);
if (fs->reads_point_coord)
panfrost_emit_point_coord(&varyings[gl_PointCoord]);
if (fs->reads_face)
panfrost_emit_front_face(&varyings[gl_FrontFacing]);
/* Let's go ahead and link varying meta to the buffer in question, now
* that that information is available */
panfrost_emit_varying_meta(trans.cpu, vs,
general, gl_Position, gl_PointSize,
gl_PointCoord, gl_FrontFacing);
panfrost_emit_varying_meta(trans.cpu + vs_size, fs,
general, gl_Position, gl_PointSize,
gl_PointCoord, gl_FrontFacing);
mali_ptr varyings_p = panfrost_upload_transient(ctx, &varyings, idx * sizeof(union mali_attr));
ctx->payloads[PIPE_SHADER_VERTEX].postfix.varyings = varyings_p;
ctx->payloads[PIPE_SHADER_FRAGMENT].postfix.varyings = varyings_p;
ctx->payloads[PIPE_SHADER_VERTEX].postfix.varying_meta = trans.gpu;
ctx->payloads[PIPE_SHADER_FRAGMENT].postfix.varying_meta = trans.gpu + vs_size;
}
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