// Copyright 2023 The MediaPipe Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "mediapipe/calculators/tensor/tensors_to_segmentation_converter_gl_texture.h"
#if !MEDIAPIPE_DISABLE_GPU
#include <memory>
#include <string>
#include <tuple>
#include <vector>
#include "absl/status/status.h"
#include "absl/status/statusor.h"
#include "absl/strings/str_cat.h"
#include "mediapipe/calculators/tensor/tensors_to_segmentation_calculator.pb.h"
#include "mediapipe/calculators/tensor/tensors_to_segmentation_converter.h"
#include "mediapipe/calculators/tensor/tensors_to_segmentation_utils.h"
#include "mediapipe/framework/calculator_context.h"
#include "mediapipe/framework/calculator_framework.h"
#include "mediapipe/framework/formats/image.h"
#include "mediapipe/framework/formats/tensor.h"
#include "mediapipe/framework/port/ret_check.h"
#include "mediapipe/framework/port/status_macros.h"
#include "mediapipe/gpu/gl_base.h"
#include "mediapipe/gpu/gl_calculator_helper.h"
#include "mediapipe/gpu/gl_simple_shaders.h"
#include "mediapipe/gpu/gpu_buffer_format.h"
#include "mediapipe/gpu/gpu_origin.pb.h"
#include "mediapipe/gpu/shader_util.h"
namespace mediapipe {
namespace {
enum { ATTRIB_VERTEX, ATTRIB_TEXTURE_POSITION, NUM_ATTRIBUTES };
using ::mediapipe::tensors_to_segmentation_utils::GetHwcFromDims;
using ::mediapipe::tensors_to_segmentation_utils::GlRender;
class TensorsToSegmentationGlTextureConverter
: public TensorsToSegmentationConverter {
public:
~TensorsToSegmentationGlTextureConverter() override;
absl::Status Init(CalculatorContext* cc,
const TensorsToSegmentationCalculatorOptions& options);
absl::StatusOr<std::unique_ptr<Image>> Convert(
const std::vector<Tensor>& input_tensors, int output_width,
int output_height) override;
private:
mediapipe::GlCalculatorHelper gpu_helper_;
// TODO: Refactor upsample program out of the conversion.
GLuint upsample_program_;
bool gpu_initialized_ = false;
GLuint mask_program_20_;
};
TensorsToSegmentationGlTextureConverter::
~TensorsToSegmentationGlTextureConverter() {
if (gpu_initialized_) {
gpu_helper_.RunInGlContext([this] {
if (upsample_program_) glDeleteProgram(upsample_program_);
upsample_program_ = 0;
if (mask_program_20_) glDeleteProgram(mask_program_20_);
mask_program_20_ = 0;
});
}
}
absl::Status TensorsToSegmentationGlTextureConverter::Init(
CalculatorContext* cc,
const TensorsToSegmentationCalculatorOptions& options) {
MP_RETURN_IF_ERROR(gpu_helper_.Open(cc));
MP_RETURN_IF_ERROR(gpu_helper_.RunInGlContext([this,
&options]() -> absl::Status {
// A shader to process a segmentation tensor into an output mask.
// Currently uses 4 channels for output, and sets R+A channels as mask
// value.
const std::string shader_header = absl::StrCat(
std::string(mediapipe::kMediaPipeFragmentShaderPreamble), R"(
DEFAULT_PRECISION(mediump, float)
)");
/* Shader defines will be inserted here. */
const std::string shader_src_main = R"(
in vec2 sample_coordinate;
uniform sampler2D input_texture;
#ifdef GL_ES
#define fragColor gl_FragColor
#else
out vec4 fragColor;
#endif // defined(GL_ES);
void main() {
#ifdef FLIP_Y_COORD
float y_coord = 1.0 - sample_coordinate.y;
#else
float y_coord = sample_coordinate.y;
#endif // defined(FLIP_Y_COORD)
vec2 adjusted_coordinate = vec2(sample_coordinate.x, y_coord);
vec4 input_value = texture2D(input_texture, adjusted_coordinate);
// Run activation function.
// One and only one of FN_SOFTMAX,FN_SIGMOID,FN_NONE will be defined.
#ifdef FN_SOFTMAX
// Only two channel input tensor is supported.
vec2 input_px = input_value.rg;
float shift = max(input_px.r, input_px.g);
float softmax_denom = exp(input_px.r - shift) + exp(input_px.g - shift);
float new_mask_value =
exp(mix(input_px.r, input_px.g, float(OUTPUT_LAYER_INDEX)) - shift) / softmax_denom;
#endif // FN_SOFTMAX
#ifdef FN_SIGMOID
float new_mask_value = 1.0 / (exp(-input_value.r) + 1.0);
#endif // FN_SIGMOID
#ifdef FN_NONE
float new_mask_value = input_value.r;
#endif // FN_NONE
vec4 out_value = vec4(new_mask_value, 0.0, 0.0, new_mask_value);
fragColor = out_value;
})";
// Shader defines.
using Options = ::mediapipe::TensorsToSegmentationCalculatorOptions;
const std::string output_layer_index =
"\n#define OUTPUT_LAYER_INDEX int(" +
std::to_string(options.output_layer_index()) + ")";
bool gpu_texture_starts_at_bottom =
(options.gpu_origin() != mediapipe::GpuOrigin::TOP_LEFT);
const std::string flip_y_coord =
gpu_texture_starts_at_bottom ? "\n#define FLIP_Y_COORD" : "";
const std::string fn_none =
options.activation() == Options::NONE ? "\n#define FN_NONE" : "";
const std::string fn_sigmoid =
options.activation() == Options::SIGMOID ? "\n#define FN_SIGMOID" : "";
const std::string fn_softmax =
options.activation() == Options::SOFTMAX ? "\n#define FN_SOFTMAX" : "";
const std::string two_channel = options.activation() == Options::SOFTMAX
? "\n#define TWO_CHANNEL_INPUT"
: "";
const std::string shader_defines =
absl::StrCat(output_layer_index, flip_y_coord, fn_softmax, fn_sigmoid,
fn_none, two_channel);
// Build full shader.
const std::string shader_src_no_previous =
absl::StrCat(shader_header, shader_defines, shader_src_main);
// Vertex shader attributes.
const GLint attr_location[NUM_ATTRIBUTES] = {
ATTRIB_VERTEX,
ATTRIB_TEXTURE_POSITION,
};
const GLchar* attr_name[NUM_ATTRIBUTES] = {
"position",
"texture_coordinate",
};
// Main shader program & parameters
mediapipe::GlhCreateProgram(
mediapipe::kBasicVertexShader, shader_src_no_previous.c_str(),
NUM_ATTRIBUTES, &attr_name[0], attr_location, &mask_program_20_);
RET_CHECK(mask_program_20_) << "Problem initializing the program.";
glUseProgram(mask_program_20_);
glUniform1i(glGetUniformLocation(mask_program_20_, "input_texture"), 1);
// Simple pass-through program, used for hardware upsampling.
mediapipe::GlhCreateProgram(
mediapipe::kBasicVertexShader, mediapipe::kBasicTexturedFragmentShader,
NUM_ATTRIBUTES, &attr_name[0], attr_location, &upsample_program_);
RET_CHECK(upsample_program_) << "Problem initializing the program.";
glUseProgram(upsample_program_);
glUniform1i(glGetUniformLocation(upsample_program_, "video_frame"), 1);
return absl::OkStatus();
}));
gpu_initialized_ = true;
return absl::OkStatus();
}
// Steps:
// 1. receive tensor
// 2. process segmentation tensor into small mask
// 3. upsample small mask into output mask to be same size as input image
absl::StatusOr<std::unique_ptr<Image>>
TensorsToSegmentationGlTextureConverter::Convert(
const std::vector<Tensor>& input_tensors, int output_width,
int output_height) {
if (input_tensors.empty()) {
return absl::InvalidArgumentError("input_tensors vector is empty.");
}
std::unique_ptr<Image> output_image_mask;
MP_RETURN_IF_ERROR(gpu_helper_.RunInGlContext(
[this, &input_tensors, output_width, output_height,
&output_image_mask]() -> absl::Status {
MP_ASSIGN_OR_RETURN(auto hwc,
GetHwcFromDims(input_tensors[0].shape().dims));
auto [tensor_height, tensor_width, tensor_channels] = hwc;
// Create initial working mask texture.
mediapipe::GlTexture small_mask_texture;
// Run shader, process mask tensor.
{
small_mask_texture = gpu_helper_.CreateDestinationTexture(
tensor_width, tensor_height,
mediapipe::GpuBufferFormat::kBGRA32); // actually GL_RGBA8
// Go through CPU if not already texture 2D (no direct conversion
// yet). Tensor::GetOpenGlTexture2dReadView() doesn't automatically
// convert types.
if (!input_tensors[0].ready_as_opengl_texture_2d()) {
(void)input_tensors[0].GetCpuReadView();
}
auto read_view = input_tensors[0].GetOpenGlTexture2dReadView();
gpu_helper_.BindFramebuffer(small_mask_texture);
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D, read_view.name());
glUseProgram(mask_program_20_);
GlRender();
glBindTexture(GL_TEXTURE_2D, 0);
glFlush();
}
// Upsample small mask into output.
mediapipe::GlTexture output_texture =
gpu_helper_.CreateDestinationTexture(
output_width, output_height,
mediapipe::GpuBufferFormat::kBGRA32); // actually GL_RGBA8
// Run shader, upsample result.
{
gpu_helper_.BindFramebuffer(output_texture);
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D, small_mask_texture.name());
glUseProgram(upsample_program_);
GlRender();
glBindTexture(GL_TEXTURE_2D, 0);
glFlush();
}
// Send out image as GPU packet.
output_image_mask = output_texture.GetFrame<Image>();
// Cleanup
output_texture.Release();
return absl::OkStatus();
}));
return output_image_mask;
}
} // namespace
absl::StatusOr<std::unique_ptr<TensorsToSegmentationConverter>>
CreateGlTextureConverter(
CalculatorContext* cc,
const mediapipe::TensorsToSegmentationCalculatorOptions& options) {
auto converter = std::make_unique<TensorsToSegmentationGlTextureConverter>();
MP_RETURN_IF_ERROR(converter->Init(cc, options));
return converter;
}
} // namespace mediapipe
#endif // !MEDIAPIPE_DISABLE_GPU
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