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obs-StreamFX/source/gfx/blur/gfx-blur-gaussian.cpp
Michael Fabian 'Xaymar' Dirks fedc8e075c gfx/blur/gaussian: Refactor Gaussian Blur 
Gaussian Blur is another Blur that now supports the new system, increasing the maxium Blur size to 128 and adding support for Rotational and Zoom blur. Various optimizations were done to the actual shader code which further reduced the GPU usage.

Currently the Gaussian curve is recalculated when the blur is first created, which can lead to a short hitch due to it having to search for the correct kernels. This is currently unavoidable and expected behavior until a better solution is found.

Related: #45, #6
2019-04-02 03:50:01 +02:00

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// Modern effects for a modern Streamer
// Copyright (C) 2019 Michael Fabian Dirks
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
#include "gfx-blur-gaussian.hpp"
#include "plugin.hpp"
#include "util-math.hpp"
#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable : 4201)
#endif
#include <obs-module.h>
#include <obs.h>
#ifdef _MSC_VER
#pragma warning(pop)
#endif
// FIXME: This breaks when MAX_KERNEL_SIZE is changed, due to the way the Gaussian
// function first goes up at the point, and then once we pass the critical point
// will go down again and it is not handled well. This is a pretty basic
// approximation anyway at the moment.
#define MAX_KERNEL_SIZE 128
#define MAX_BLUR_SIZE (MAX_KERNEL_SIZE - 1)
#define SEARCH_DENSITY double_t(1. / 500.)
#define SEARCH_THRESHOLD double_t(1. / (MAX_KERNEL_SIZE * 5))
#define SEARCH_EXTENSION 1
#define SEARCH_RANGE MAX_KERNEL_SIZE * 2
gfx::blur::gaussian_data::gaussian_data()
{
{
char* file = obs_module_file("effects/blur/gaussian.effect");
m_effect = std::make_shared<gs::effect>(file);
bfree(file);
}
// Precalculate Kernels
for (size_t kernel_size = 1; kernel_size <= MAX_BLUR_SIZE; kernel_size++) {
std::vector<double_t> kernel_math(MAX_KERNEL_SIZE);
std::vector<float_t> kernel_data(MAX_KERNEL_SIZE);
double_t actual_width = 1.;
// Find actual kernel width.
for (double_t h = SEARCH_DENSITY; h < SEARCH_RANGE; h += SEARCH_DENSITY) {
if (util::math::gaussian<double_t>(double_t(kernel_size + SEARCH_EXTENSION), h) > SEARCH_THRESHOLD) {
actual_width = h;
break;
}
}
// Calculate and normalize
double_t sum = 0;
for (size_t p = 0; p <= kernel_size; p++) {
kernel_math[p] = util::math::gaussian<double_t>(double_t(p), actual_width);
sum += kernel_math[p] * (p > 0 ? 2 : 1);
}
// Normalize to fill the entire 0..1 range over the width.
double_t inverse_sum = 1.0 / sum;
for (size_t p = 0; p <= kernel_size; p++) {
kernel_data.at(p) = float_t(kernel_math[p] * inverse_sum);
}
m_kernels.push_back(std::move(kernel_data));
}
}
gfx::blur::gaussian_data::~gaussian_data()
{
m_effect.reset();
}
std::shared_ptr<::gs::effect> gfx::blur::gaussian_data::get_effect()
{
return m_effect;
}
std::vector<float_t> const& gfx::blur::gaussian_data::get_kernel(size_t width)
{
if (width < 1)
width = 1;
if (width > MAX_BLUR_SIZE)
width = MAX_BLUR_SIZE;
width -= 1;
return m_kernels[width];
}
gfx::blur::gaussian_factory::gaussian_factory() {}
gfx::blur::gaussian_factory::~gaussian_factory() {}
bool gfx::blur::gaussian_factory::is_type_supported(::gfx::blur::type v)
{
switch (v) {
case ::gfx::blur::type::Area:
return true;
case ::gfx::blur::type::Directional:
return true;
case ::gfx::blur::type::Rotational:
return true;
case ::gfx::blur::type::Zoom:
return true;
default:
return false;
}
}
std::shared_ptr<::gfx::blur::ibase> gfx::blur::gaussian_factory::create(::gfx::blur::type v)
{
switch (v) {
case ::gfx::blur::type::Area:
return std::make_shared<::gfx::blur::gaussian>();
case ::gfx::blur::type::Directional:
return std::static_pointer_cast<::gfx::blur::gaussian>(std::make_shared<::gfx::blur::gaussian_directional>());
case ::gfx::blur::type::Rotational:
return std::make_shared<::gfx::blur::gaussian_rotational>();
case ::gfx::blur::type::Zoom:
return std::make_shared<::gfx::blur::gaussian_zoom>();
default:
throw std::runtime_error("Invalid type.");
}
}
double_t gfx::blur::gaussian_factory::get_min_size(::gfx::blur::type)
{
return double_t(1.0);
}
double_t gfx::blur::gaussian_factory::get_step_size(::gfx::blur::type)
{
return double_t(1.0);
}
double_t gfx::blur::gaussian_factory::get_max_size(::gfx::blur::type)
{
return double_t(MAX_BLUR_SIZE);
}
double_t gfx::blur::gaussian_factory::get_min_angle(::gfx::blur::type v)
{
switch (v) {
case ::gfx::blur::type::Directional:
case ::gfx::blur::type::Rotational:
return -180.0;
default:
return 0;
}
}
double_t gfx::blur::gaussian_factory::get_step_angle(::gfx::blur::type)
{
return double_t(0.01);
}
double_t gfx::blur::gaussian_factory::get_max_angle(::gfx::blur::type v)
{
switch (v) {
case ::gfx::blur::type::Directional:
case ::gfx::blur::type::Rotational:
return 180.0;
default:
return 0;
}
}
bool gfx::blur::gaussian_factory::is_step_scale_supported(::gfx::blur::type v)
{
switch (v) {
case ::gfx::blur::type::Area:
case ::gfx::blur::type::Zoom:
case ::gfx::blur::type::Directional:
return true;
default:
return false;
}
}
double_t gfx::blur::gaussian_factory::get_min_step_scale_x(::gfx::blur::type)
{
return double_t(0.01);
}
double_t gfx::blur::gaussian_factory::get_step_step_scale_x(::gfx::blur::type)
{
return double_t(0.01);
}
double_t gfx::blur::gaussian_factory::get_max_step_scale_x(::gfx::blur::type)
{
return double_t(1000.0);
}
double_t gfx::blur::gaussian_factory::get_min_step_scale_y(::gfx::blur::type)
{
return double_t(0.01);
}
double_t gfx::blur::gaussian_factory::get_step_step_scale_y(::gfx::blur::type)
{
return double_t(0.01);
}
double_t gfx::blur::gaussian_factory::get_max_step_scale_y(::gfx::blur::type)
{
return double_t(1000.0);
}
std::shared_ptr<::gfx::blur::gaussian_data> gfx::blur::gaussian_factory::data()
{
std::unique_lock<std::mutex> ulock(m_data_lock);
std::shared_ptr<::gfx::blur::gaussian_data> data = m_data.lock();
if (!data) {
data = std::make_shared<::gfx::blur::gaussian_data>();
m_data = data;
}
return data;
}
::gfx::blur::gaussian_factory& gfx::blur::gaussian_factory::get()
{
static ::gfx::blur::gaussian_factory instance;
return instance;
}
gfx::blur::gaussian::gaussian()
: m_size(1.), m_step_scale({1., 1.}), m_data(::gfx::blur::gaussian_factory::get().data())
{
m_rendertarget = std::make_shared<gs::rendertarget>(GS_RGBA, GS_ZS_NONE);
m_rendertarget2 = std::make_shared<gs::rendertarget>(GS_RGBA, GS_ZS_NONE);
}
gfx::blur::gaussian::~gaussian() {}
void gfx::blur::gaussian::set_input(std::shared_ptr<::gs::texture> texture)
{
m_input_texture = texture;
}
::gfx::blur::type gfx::blur::gaussian::get_type()
{
return ::gfx::blur::type::Area;
}
double_t gfx::blur::gaussian::get_size()
{
return m_size;
}
void gfx::blur::gaussian::set_size(double_t width)
{
if (width < 1.)
width = 1.;
if (width > MAX_BLUR_SIZE)
width = MAX_BLUR_SIZE;
m_size = width;
}
void gfx::blur::gaussian::set_step_scale(double_t x, double_t y)
{
m_step_scale.first = x;
m_step_scale.second = y;
}
void gfx::blur::gaussian::get_step_scale(double_t& x, double_t& y)
{
x = m_step_scale.first;
y = m_step_scale.second;
}
double_t gfx::blur::gaussian::get_step_scale_x()
{
return m_step_scale.first;
}
double_t gfx::blur::gaussian::get_step_scale_y()
{
return m_step_scale.second;
}
std::shared_ptr<::gs::texture> gfx::blur::gaussian::render()
{
std::shared_ptr<::gs::effect> effect = m_data->get_effect();
auto kernel = m_data->get_kernel(size_t(m_size));
if (!effect || ((m_step_scale.first + m_step_scale.second) < FLT_EPSILON)) {
return m_input_texture;
}
float_t width = float_t(m_input_texture->get_width());
float_t height = float_t(m_input_texture->get_height());
// Setup
obs_enter_graphics();
gs_set_cull_mode(GS_NEITHER);
gs_enable_color(true, true, true, true);
gs_enable_depth_test(false);
gs_depth_function(GS_ALWAYS);
gs_blend_state_push();
gs_reset_blend_state();
gs_enable_blending(false);
gs_blend_function(GS_BLEND_ONE, GS_BLEND_ZERO);
gs_enable_stencil_test(false);
gs_enable_stencil_write(false);
gs_stencil_function(GS_STENCIL_BOTH, GS_ALWAYS);
gs_stencil_op(GS_STENCIL_BOTH, GS_ZERO, GS_ZERO, GS_ZERO);
effect->get_parameter("pImage").set_texture(m_input_texture);
effect->get_parameter("pStepScale").set_float2(float_t(m_step_scale.first), float_t(m_step_scale.second));
effect->get_parameter("pSize").set_float(float_t(m_size));
effect->get_parameter("pKernel").set_float_array(kernel.data(), MAX_KERNEL_SIZE);
// First Pass
if (m_step_scale.first > FLT_EPSILON) {
effect->get_parameter("pImageTexel").set_float2(float_t(1. / width), 0.);
{
auto op = m_rendertarget2->render(uint32_t(width), uint32_t(height));
gs_ortho(0, 1., 0, 1., 0, 1.);
while (gs_effect_loop(effect->get_object(), "Draw")) {
gs_draw_sprite(0, 0, 1, 1);
}
}
std::swap(m_rendertarget, m_rendertarget2);
effect->get_parameter("pImage").set_texture(m_rendertarget->get_texture());
}
// Second Pass
if (m_step_scale.second > FLT_EPSILON) {
effect->get_parameter("pImageTexel").set_float2(0., float_t(1. / height));
{
auto op = m_rendertarget2->render(uint32_t(width), uint32_t(height));
gs_ortho(0, 1., 0, 1., 0, 1.);
while (gs_effect_loop(effect->get_object(), "Draw")) {
gs_draw_sprite(0, 0, 1, 1);
}
}
std::swap(m_rendertarget, m_rendertarget2);
}
gs_blend_state_pop();
obs_leave_graphics();
return this->get();
}
std::shared_ptr<::gs::texture> gfx::blur::gaussian::get()
{
return m_rendertarget->get_texture();
}
gfx::blur::gaussian_directional::gaussian_directional() : m_angle(0.) {}
gfx::blur::gaussian_directional::~gaussian_directional() {}
::gfx::blur::type gfx::blur::gaussian_directional::get_type()
{
return ::gfx::blur::type::Directional;
}
double_t gfx::blur::gaussian_directional::get_angle()
{
return RAD_TO_DEG(m_angle);
}
void gfx::blur::gaussian_directional::set_angle(double_t angle)
{
m_angle = DEG_TO_RAD(angle);
}
std::shared_ptr<::gs::texture> gfx::blur::gaussian_directional::render()
{
std::shared_ptr<::gs::effect> effect = m_data->get_effect();
auto kernel = m_data->get_kernel(size_t(m_size));
if (!effect || ((m_step_scale.first + m_step_scale.second) < FLT_EPSILON)) {
return m_input_texture;
}
float_t width = float_t(m_input_texture->get_width());
float_t height = float_t(m_input_texture->get_height());
// Setup
obs_enter_graphics();
gs_set_cull_mode(GS_NEITHER);
gs_enable_color(true, true, true, true);
gs_enable_depth_test(false);
gs_depth_function(GS_ALWAYS);
gs_blend_state_push();
gs_reset_blend_state();
gs_enable_blending(false);
gs_blend_function(GS_BLEND_ONE, GS_BLEND_ZERO);
gs_enable_stencil_test(false);
gs_enable_stencil_write(false);
gs_stencil_function(GS_STENCIL_BOTH, GS_ALWAYS);
gs_stencil_op(GS_STENCIL_BOTH, GS_ZERO, GS_ZERO, GS_ZERO);
effect->get_parameter("pImage").set_texture(m_input_texture);
effect->get_parameter("pImageTexel")
.set_float2(float_t(1. / width * cos(m_angle)), float_t(1. / height * sin(m_angle)));
effect->get_parameter("pStepScale").set_float2(float_t(m_step_scale.first), float_t(m_step_scale.second));
effect->get_parameter("pSize").set_float(float_t(m_size));
effect->get_parameter("pKernel").set_float_array(kernel.data(), MAX_KERNEL_SIZE);
// First Pass
{
auto op = m_rendertarget->render(uint32_t(width), uint32_t(height));
gs_ortho(0, 1., 0, 1., 0, 1.);
while (gs_effect_loop(effect->get_object(), "Draw")) {
gs_draw_sprite(0, 0, 1, 1);
}
}
gs_blend_state_pop();
obs_leave_graphics();
return this->get();
}
::gfx::blur::type gfx::blur::gaussian_rotational::get_type()
{
return ::gfx::blur::type::Rotational;
}
std::shared_ptr<::gs::texture> gfx::blur::gaussian_rotational::render()
{
std::shared_ptr<::gs::effect> effect = m_data->get_effect();
auto kernel = m_data->get_kernel(size_t(m_size));
if (!effect || ((m_step_scale.first + m_step_scale.second) < FLT_EPSILON)) {
return m_input_texture;
}
float_t width = float_t(m_input_texture->get_width());
float_t height = float_t(m_input_texture->get_height());
// Setup
obs_enter_graphics();
gs_set_cull_mode(GS_NEITHER);
gs_enable_color(true, true, true, true);
gs_enable_depth_test(false);
gs_depth_function(GS_ALWAYS);
gs_blend_state_push();
gs_reset_blend_state();
gs_enable_blending(false);
gs_blend_function(GS_BLEND_ONE, GS_BLEND_ZERO);
gs_enable_stencil_test(false);
gs_enable_stencil_write(false);
gs_stencil_function(GS_STENCIL_BOTH, GS_ALWAYS);
gs_stencil_op(GS_STENCIL_BOTH, GS_ZERO, GS_ZERO, GS_ZERO);
effect->get_parameter("pImage").set_texture(m_input_texture);
effect->get_parameter("pImageTexel").set_float2(float_t(1. / width), float_t(1. / height));
effect->get_parameter("pStepScale").set_float2(float_t(m_step_scale.first), float_t(m_step_scale.second));
effect->get_parameter("pSize").set_float(float_t(m_size));
effect->get_parameter("pAngle").set_float(float_t(m_angle / m_size));
effect->get_parameter("pCenter").set_float2(float_t(m_center.first), float_t(m_center.second));
effect->get_parameter("pKernel").set_float_array(kernel.data(), MAX_KERNEL_SIZE);
// First Pass
{
auto op = m_rendertarget->render(uint32_t(width), uint32_t(height));
gs_ortho(0, 1., 0, 1., 0, 1.);
while (gs_effect_loop(effect->get_object(), "Rotate")) {
gs_draw_sprite(0, 0, 1, 1);
}
}
gs_blend_state_pop();
obs_leave_graphics();
return this->get();
}
void gfx::blur::gaussian_rotational::set_center(double_t x, double_t y)
{
m_center.first = x;
m_center.second = y;
}
void gfx::blur::gaussian_rotational::get_center(double_t& x, double_t& y)
{
x = m_center.first;
y = m_center.second;
}
double_t gfx::blur::gaussian_rotational::get_angle()
{
return double_t(RAD_TO_DEG(m_angle));
}
void gfx::blur::gaussian_rotational::set_angle(double_t angle)
{
m_angle = DEG_TO_RAD(angle);
}
::gfx::blur::type gfx::blur::gaussian_zoom::get_type()
{
return ::gfx::blur::type::Zoom;
}
std::shared_ptr<::gs::texture> gfx::blur::gaussian_zoom::render()
{
std::shared_ptr<::gs::effect> effect = m_data->get_effect();
auto kernel = m_data->get_kernel(size_t(m_size));
if (!effect || ((m_step_scale.first + m_step_scale.second) < FLT_EPSILON)) {
return m_input_texture;
}
float_t width = float_t(m_input_texture->get_width());
float_t height = float_t(m_input_texture->get_height());
// Setup
obs_enter_graphics();
gs_set_cull_mode(GS_NEITHER);
gs_enable_color(true, true, true, true);
gs_enable_depth_test(false);
gs_depth_function(GS_ALWAYS);
gs_blend_state_push();
gs_reset_blend_state();
gs_enable_blending(false);
gs_blend_function(GS_BLEND_ONE, GS_BLEND_ZERO);
gs_enable_stencil_test(false);
gs_enable_stencil_write(false);
gs_stencil_function(GS_STENCIL_BOTH, GS_ALWAYS);
gs_stencil_op(GS_STENCIL_BOTH, GS_ZERO, GS_ZERO, GS_ZERO);
effect->get_parameter("pImage").set_texture(m_input_texture);
effect->get_parameter("pImageTexel").set_float2(float_t(1. / width), float_t(1. / height));
effect->get_parameter("pStepScale").set_float2(float_t(m_step_scale.first), float_t(m_step_scale.second));
effect->get_parameter("pSize").set_float(float_t(m_size));
effect->get_parameter("pCenter").set_float2(float_t(m_center.first), float_t(m_center.second));
effect->get_parameter("pKernel").set_float_array(kernel.data(), MAX_KERNEL_SIZE);
// First Pass
{
auto op = m_rendertarget->render(uint32_t(width), uint32_t(height));
gs_ortho(0, 1., 0, 1., 0, 1.);
while (gs_effect_loop(effect->get_object(), "Zoom")) {
gs_draw_sprite(0, 0, 1, 1);
}
}
gs_blend_state_pop();
obs_leave_graphics();
return this->get();
}
void gfx::blur::gaussian_zoom::set_center(double_t x, double_t y)
{
m_center.first = x;
m_center.second = y;
}
void gfx::blur::gaussian_zoom::get_center(double_t& x, double_t& y)
{
x = m_center.first;
y = m_center.second;
}
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