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/* SPDX-License-Identifier: GPL-2.0-or-later */
#include "GPU_state.h"
#include "GPU_texture.h"
#include "MEM_guardedalloc.h"
#include "COM_context.hh"
#include "COM_input_descriptor.hh"
#include "COM_reduce_to_single_value_operation.hh"
#include "COM_result.hh"
namespace blender::realtime_compositor {
ReduceToSingleValueOperation::ReduceToSingleValueOperation(Context &context, ResultType type)
: SimpleOperation(context)
{
InputDescriptor input_descriptor;
input_descriptor.type = type;
declare_input_descriptor(input_descriptor);
populate_result(Result(type, texture_pool()));
}
void ReduceToSingleValueOperation::execute()
{
/* Make sure any prior writes to the texture are reflected before downloading it. */
GPU_memory_barrier(GPU_BARRIER_TEXTURE_UPDATE);
const Result &input = get_input();
float *pixel = static_cast<float *>(GPU_texture_read(input.texture(), GPU_DATA_FLOAT, 0));
Result &result = get_result();
result.allocate_single_value();
switch (result.type()) {
case ResultType::Color:
result.set_color_value(pixel);
break;
case ResultType::Vector:
result.set_vector_value(pixel);
break;
case ResultType::Float:
result.set_float_value(*pixel);
break;
}
MEM_freeN(pixel);
}
SimpleOperation *ReduceToSingleValueOperation::construct_if_needed(Context &context,
const Result &input_result)
{
/* Input result is already a single value, the operation is not needed. */
if (input_result.is_single_value()) {
return nullptr;
}
/* The input is a full sized texture and can't be reduced to a single value, the operation is not
* needed. */
if (input_result.domain().size != int2(1)) {
return nullptr;
}
/* The input is a texture of a single pixel and can be reduced to a single value. */
return new ReduceToSingleValueOperation(context, input_result.type());
}
} // namespace blender::realtime_compositor
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