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obs-StreamFX/source/obs/gs/gs-mipmapper.cpp
lainon 6e1566386e project: Apply more C++ paradigms to the code 
- Use auto in places where code clarity is improved or identical.
- Replace trivial constructors and destructors with default.
- Use true random for random generation.
- Use std::string_view where it is valid to do so.
- Apply const where it is valid to do so.
- Use references where it is valid to do so.
- Manually optimize memory usage with std::move and std::copy.
- Opt for memory efficient containers where the size is known ahead of time.

Signed-off-by: lainon <GermanAizek@yandex.ru>
2023-04-05 18:58:32 +02:00

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/*
* Modern effects for a modern Streamer
* Copyright (C) 2017 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 "gs-mipmapper.hpp"
#include <sstream>
#include <stdexcept>
#include "obs/gs/gs-helper.hpp"
#include "plugin.hpp"
// Direct3D 11
#ifdef _WIN32
#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable : 4191 4242 4244 4365 4777 4986 5039 5204)
#endif
#include <Windows.h>
#include <atlutil.h>
#include <d3d11.h>
#include <dxgi.h>
#ifdef _MSC_VER
#pragma warning(pop)
#endif
#endif
// OpenGL
#include "glad/gl.h"
#ifdef _WIN32
struct d3d_info {
ID3D11Device* device = nullptr;
ID3D11DeviceContext* context = nullptr;
ID3D11Resource* target = nullptr;
};
void d3d_initialize(d3d_info& info, std::shared_ptr<streamfx::obs::gs::texture> source,
std::shared_ptr<streamfx::obs::gs::texture> target)
{
info.target = reinterpret_cast<ID3D11Resource*>(gs_texture_get_obj(target->get_object()));
info.device = reinterpret_cast<ID3D11Device*>(gs_get_device_obj());
info.device->GetImmediateContext(&info.context);
}
void d3d_copy_subregion(d3d_info& info, std::shared_ptr<streamfx::obs::gs::texture> source, uint32_t mip_level,
uint32_t width, uint32_t height)
{
D3D11_BOX box = {0, 0, 0, width, height, 1};
auto source_ref = reinterpret_cast<ID3D11Resource*>(gs_texture_get_obj(source->get_object()));
info.context->CopySubresourceRegion(info.target, mip_level, 0, 0, 0, source_ref, 0, &box);
}
#endif
struct opengl_info {
GLuint target = 0;
GLuint fbo = 0;
};
std::string opengl_translate_error(GLenum error)
{
#define TRANSLATE_CASE(X) \
case X: \
return #X;
switch (error) {
TRANSLATE_CASE(GL_NO_ERROR);
TRANSLATE_CASE(GL_INVALID_ENUM);
TRANSLATE_CASE(GL_INVALID_VALUE);
TRANSLATE_CASE(GL_INVALID_OPERATION);
TRANSLATE_CASE(GL_STACK_OVERFLOW);
TRANSLATE_CASE(GL_STACK_UNDERFLOW);
TRANSLATE_CASE(GL_OUT_OF_MEMORY);
TRANSLATE_CASE(GL_INVALID_FRAMEBUFFER_OPERATION);
}
return std::to_string(error);
#undef TRANSLATE_CASE
}
std::string opengl_translate_framebuffer_status(GLenum error)
{
#define TRANSLATE_CASE(X) \
case X: \
return #X;
switch (error) {
TRANSLATE_CASE(GL_FRAMEBUFFER_COMPLETE);
TRANSLATE_CASE(GL_FRAMEBUFFER_UNDEFINED);
TRANSLATE_CASE(GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT);
TRANSLATE_CASE(GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT);
TRANSLATE_CASE(GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER);
TRANSLATE_CASE(GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER);
TRANSLATE_CASE(GL_FRAMEBUFFER_UNSUPPORTED);
TRANSLATE_CASE(GL_FRAMEBUFFER_INCOMPLETE_MULTISAMPLE);
TRANSLATE_CASE(GL_FRAMEBUFFER_INCOMPLETE_LAYER_TARGETS);
}
return std::to_string(error);
#undef TRANSLATE_CASE
}
#define D_OPENGL_CHECK_ERROR(FUNCTION) \
if (auto err = glGetError(); err != GL_NO_ERROR) { \
std::stringstream sstr; \
sstr << opengl_translate_error(err) << " = " << FUNCTION; \
throw std::runtime_error(sstr.str()); \
}
#define D_OPENGL_CHECK_FRAMEBUFFERSTATUS(BUFFER, FUNCTION) \
if (auto err = glCheckFramebufferStatus(BUFFER); err != GL_FRAMEBUFFER_COMPLETE) { \
std::stringstream sstr; \
sstr << opengl_translate_framebuffer_status(err) << " = " << FUNCTION; \
throw std::runtime_error(sstr.str()); \
}
void opengl_initialize(opengl_info& info, std::shared_ptr<streamfx::obs::gs::texture> source,
std::shared_ptr<streamfx::obs::gs::texture> target)
{
info.target = *reinterpret_cast<GLuint*>(gs_texture_get_obj(target->get_object()));
glGenFramebuffers(1, &info.fbo);
}
void opengl_finalize(opengl_info& info)
{
glDeleteFramebuffers(1, &info.fbo);
}
void opengl_copy_subregion(opengl_info& info, std::shared_ptr<streamfx::obs::gs::texture> source, uint32_t mip_level,
uint32_t width, uint32_t height)
{
GLuint source_ref = *reinterpret_cast<GLuint*>(gs_texture_get_obj(source->get_object()));
// Source -> Texture Unit 0, Read Color Framebuffer
glActiveTexture(GL_TEXTURE0);
D_OPENGL_CHECK_ERROR("glActiveTexture(GL_TEXTURE0);");
glBindTexture(GL_TEXTURE_2D, source_ref);
D_OPENGL_CHECK_ERROR("glBindTexture(GL_TEXTURE_2D, origin);");
glBindFramebuffer(GL_READ_FRAMEBUFFER, info.fbo);
D_OPENGL_CHECK_ERROR("glBindFramebuffer(GL_READ_FRAMEBUFFER, info.fbo);");
glFramebufferTexture2D(GL_READ_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, source_ref,
0); // Origin is a render target, not a texture
D_OPENGL_CHECK_ERROR(
"glFramebufferTexture2D(GL_READ_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, origin, mip_level);");
D_OPENGL_CHECK_FRAMEBUFFERSTATUS(
GL_READ_FRAMEBUFFER,
"glFramebufferTexture2D(GL_READ_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, origin, mip_level);");
// Target -> Texture Unit 1
glActiveTexture(GL_TEXTURE1);
D_OPENGL_CHECK_ERROR("glActiveTexture(GL_TEXTURE1);");
glBindTexture(GL_TEXTURE_2D, info.target);
D_OPENGL_CHECK_ERROR("glBindTexture(GL_TEXTURE_2D, info.target);");
// Copy Data
glCopyTexSubImage2D(GL_TEXTURE_2D, mip_level, 0, 0, 0, 0, width, height);
D_OPENGL_CHECK_ERROR("glCopyTexSubImage2D(GL_TEXTURE_2D, mip_level, 0, 0, 0, 0, width, height);");
// Target -/-> Texture Unit 1
glActiveTexture(GL_TEXTURE1);
D_OPENGL_CHECK_ERROR("glActiveTexture(GL_TEXTURE1);");
glBindTexture(GL_TEXTURE_2D, 0);
D_OPENGL_CHECK_ERROR("glBindTexture(GL_TEXTURE_2D, 0);");
// Source -/-> Texture Unit 0, Read Color Framebuffer
glActiveTexture(GL_TEXTURE0);
D_OPENGL_CHECK_ERROR("glActiveTexture(GL_TEXTURE0);");
glBindTexture(GL_TEXTURE_2D, 0);
D_OPENGL_CHECK_ERROR("glBindTexture(GL_TEXTURE_2D, 0);");
glBindFramebuffer(GL_READ_FRAMEBUFFER, info.fbo);
D_OPENGL_CHECK_ERROR("glBindFramebuffer(GL_READ_FRAMEBUFFER, info.fbo);");
glFramebufferTexture2D(GL_READ_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, 0, 0);
D_OPENGL_CHECK_ERROR("glFramebufferTexture2D(GL_READ_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, 0, 0);");
glBindFramebuffer(GL_READ_FRAMEBUFFER, 0);
D_OPENGL_CHECK_ERROR("glBindFramebuffer(GL_READ_FRAMEBUFFER, 0);");
}
streamfx::obs::gs::mipmapper::~mipmapper()
{
_rt.reset();
_effect.reset();
}
streamfx::obs::gs::mipmapper::mipmapper()
{
auto gctx = streamfx::obs::gs::context();
{
auto file = streamfx::data_file_path("effects/mipgen.effect");
try {
_effect = streamfx::obs::gs::effect::create(file);
} catch (const std::exception& ex) {
DLOG_ERROR("Error loading '%s': %s", file.generic_u8string().c_str(), ex.what());
}
}
}
uint32_t streamfx::obs::gs::mipmapper::calculate_max_mip_level(uint32_t width, uint32_t height)
{
return static_cast<uint32_t>(1 + std::lroundl(floor(log2(std::max<GLint>(width, height)))));
}
void streamfx::obs::gs::mipmapper::rebuild(std::shared_ptr<streamfx::obs::gs::texture> source,
std::shared_ptr<streamfx::obs::gs::texture> target)
{
{ // Validate arguments and structure.
if (!source || !target)
return; // Do nothing if source or target are missing.
if (!_effect)
return; // Do nothing if the necessary data failed to load.
// Ensure texture sizes match
if ((source->get_width() != target->get_width()) || (source->get_height() != target->get_height())) {
throw std::invalid_argument("source and target must have same size");
}
// Ensure texture types match
if ((source->get_type() != target->get_type())) {
throw std::invalid_argument("source and target must have same type");
}
// Ensure texture formats match
if ((source->get_color_format() != target->get_color_format())) {
throw std::invalid_argument("source and target must have same format");
}
}
// Get a unique lock on the graphics context.
auto gctx = streamfx::obs::gs::context();
// Do we need to recreate the render target for a different format?
if ((!_rt) || (source->get_color_format() != _rt->get_color_format())) {
_rt = std::make_unique<streamfx::obs::gs::rendertarget>(source->get_color_format(), GS_ZS_NONE);
}
// Initialize API Handlers.
opengl_info oglinfo;
if (gs_get_device_type() == GS_DEVICE_OPENGL) {
opengl_initialize(oglinfo, source, target);
}
#ifdef _WIN32
d3d_info d3dinfo;
if (gs_get_device_type() == GS_DEVICE_DIRECT3D_11) {
d3d_initialize(d3dinfo, source, target);
}
#endif
// Use different methods for different types of textures.
if (source->get_type() == streamfx::obs::gs::texture::type::Normal) {
uint32_t width = source->get_width();
uint32_t height = source->get_height();
size_t max_mip_level = calculate_max_mip_level(width, height);
{
#ifdef ENABLE_PROFILING
auto cctr = streamfx::obs::gs::debug_marker(streamfx::obs::gs::debug_color_azure_radiance,
"Mip Level %" PRId64 "", 0);
#endif
// Retrieve maximum mip map level.
#ifdef _WIN32
if (gs_get_device_type() == GS_DEVICE_DIRECT3D_11) {
d3d_copy_subregion(d3dinfo, source, 0, width, height);
}
#endif
if (gs_get_device_type() == GS_DEVICE_OPENGL) {
opengl_copy_subregion(oglinfo, source, 0, width, height);
}
}
// Set up rendering state.
gs_blend_state_push();
gs_reset_blend_state();
gs_enable_blending(false);
gs_blend_function(GS_BLEND_ONE, GS_BLEND_ZERO);
gs_enable_color(true, true, true, true);
gs_enable_depth_test(false);
gs_enable_stencil_test(false);
gs_enable_stencil_write(false);
gs_set_cull_mode(GS_NEITHER);
// sRGB support.
bool old_srgb = gs_framebuffer_srgb_enabled();
gs_enable_framebuffer_srgb(gs_get_linear_srgb());
// Render each mip map level.
for (size_t mip = 1; mip < max_mip_level; mip++) {
#ifdef ENABLE_PROFILING
auto cctr = streamfx::obs::gs::debug_marker(streamfx::obs::gs::debug_color_azure_radiance,
"Mip Level %" PRIuMAX, mip);
#endif
uint32_t cwidth = std::max<uint32_t>(width >> mip, 1);
uint32_t cheight = std::max<uint32_t>(height >> mip, 1);
float_t iwidth = 1.f / static_cast<float_t>(cwidth);
float_t iheight = 1.f / static_cast<float_t>(cheight);
try {
auto op = _rt->render(cwidth, cheight);
gs_ortho(0, 1, 0, 1, 0, 1);
_effect.get_parameter("image").set_texture(target, gs_get_linear_srgb());
_effect.get_parameter("imageTexel").set_float2(iwidth, iheight);
_effect.get_parameter("level").set_int(int32_t(mip - 1));
while (gs_effect_loop(_effect.get_object(), "Draw")) {
streamfx::gs_draw_fullscreen_tri();
}
} catch (...) {
}
// Copy from the render target to the target mip level.
#ifdef _WIN32
if (gs_get_device_type() == GS_DEVICE_DIRECT3D_11) {
d3d_copy_subregion(d3dinfo, _rt->get_texture(), static_cast<uint32_t>(mip), cwidth, cheight);
}
#endif
if (gs_get_device_type() == GS_DEVICE_OPENGL) {
opengl_copy_subregion(oglinfo, _rt->get_texture(), static_cast<uint32_t>(mip), cwidth, cheight);
}
}
// Clean up rendering state.
gs_enable_framebuffer_srgb(old_srgb);
gs_blend_state_pop();
} else {
throw std::runtime_error("Only 2D Textures support Mip-mapping.");
}
// Finalize API handlers.
if (gs_get_device_type() == GS_DEVICE_OPENGL) {
opengl_finalize(oglinfo);
}
#ifdef _WIN32
if (gs_get_device_type() == GS_DEVICE_DIRECT3D_11) {
//d3d_finalize(d3dinfo);
}
#endif
}
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