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maszyna/rendering/opengl46/opengl46weather.cpp

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/*
This Source Code Form is subject to the
terms of the Mozilla Public License, v.
2.0. If a copy of the MPL was not
distributed with this file, You can
obtain one at
http://mozilla.org/MPL/2.0/.
*/
#include "stdafx.h"
#include "rendering/opengl46/opengl46weather.h"
#include "rendering/opengl46/opengl46sky.h"
#include "environment/weather.h"
#include "simulation/simulationenvironment.h"
#include "model/Texture.h"
#include "utilities/Globals.h"
#include "utilities/utilities.h"
namespace
{
// sizes of the noises (clouds_noise.comp)
int const SHAPE_NOISE_SIZE{128};
int const DETAIL_NOISE_SIZE{32};
int const COVERAGE_NOISE_SIZE{512};
std::unique_ptr<gl::program> make_compute(std::string const &Name)
{
gl::shader shader(Name);
return std::make_unique<gl::program>(std::vector<std::reference_wrapper<const gl::shader>>{shader});
}
std::unique_ptr<gl::program> make_program(std::string const &Vertex, std::string const &Fragment)
{
gl::shader vertex(Vertex);
gl::shader fragment(Fragment);
return std::make_unique<gl::program>(std::vector<std::reference_wrapper<const gl::shader>>{vertex, fragment});
}
GLuint groups(int const Size)
{
return static_cast<GLuint>((Size + static_cast<int>(gl::WEATHER_GROUP_SIZE) - 1) / static_cast<int>(gl::WEATHER_GROUP_SIZE));
}
} // namespace
opengl46_weather::~opengl46_weather()
{
for (auto *texture : {&m_shape_noise, &m_detail_noise, &m_coverage_noise, &m_shadow_map, &m_clouds_color, &m_clouds_depth, &m_clouds_history[0], &m_clouds_history[1], &m_panorama,
&m_fog_scattering[0], &m_fog_scattering[1], &m_fog_integrated})
release(*texture);
}
void opengl46_weather::release(GLuint &Texture)
{
if (Texture != 0)
glDeleteTextures(1, &Texture);
Texture = 0;
}
GLuint opengl46_weather::create_texture(GLenum const Target, GLenum const Format, glm::ivec3 const &Size, GLint const Filter, GLint const Wrap)
{
GLuint texture{0};
glCreateTextures(Target, 1, &texture);
if (Target == GL_TEXTURE_3D)
glTextureStorage3D(texture, 1, Format, Size.x, Size.y, Size.z);
else
glTextureStorage2D(texture, 1, Format, Size.x, Size.y);
glTextureParameteri(texture, GL_TEXTURE_MIN_FILTER, Filter);
glTextureParameteri(texture, GL_TEXTURE_MAG_FILTER, Filter);
glTextureParameteri(texture, GL_TEXTURE_WRAP_S, Wrap);
glTextureParameteri(texture, GL_TEXTURE_WRAP_T, Wrap);
glTextureParameteri(texture, GL_TEXTURE_WRAP_R, Wrap);
return texture;
}
void opengl46_weather::init()
{
m_noise_program = make_compute("clouds_noise.comp");
m_march_program = make_compute("clouds_march.comp");
m_temporal_program = make_compute("clouds_temporal.comp");
m_shadow_program = make_compute("clouds_shadow.comp");
m_horizon_program = make_compute("fog_horizon.comp");
m_inject_program = make_compute("fog_inject.comp");
m_integrate_program = make_compute("fog_integrate.comp");
m_sky_program = make_program("quad.vert", "sky_weather.frag");
m_stars_program = make_program("stars.vert", "stars.frag");
m_weather_ubo = std::make_unique<gl::ubo>(sizeof(gl::weather_ubs), gl::WEATHER_UBO_BINDING);
m_weather_ubo->update(m_state.block());
make_noise();
auto const stars{gfx::weather_state::star_vertices()};
m_stars_count = static_cast<int>(stars.size() / 2);
m_stars_vao.emplace();
m_stars_vao->bind();
m_stars_buffer.emplace();
m_stars_buffer->allocate(gl::buffer::ARRAY_BUFFER, static_cast<GLsizeiptr>(stars.size() * sizeof(glm::vec4)), GL_STATIC_DRAW);
m_stars_buffer->upload(gl::buffer::ARRAY_BUFFER, stars.data(), 0, static_cast<GLsizeiptr>(stars.size() * sizeof(glm::vec4)));
m_stars_vao->setup_attrib(*m_stars_buffer, 0, 4, GL_FLOAT, 2 * sizeof(glm::vec4), 0);
m_stars_vao->setup_attrib(*m_stars_buffer, 1, 4, GL_FLOAT, 2 * sizeof(glm::vec4), sizeof(glm::vec4));
gl::vao::unbind();
}
void opengl46_weather::make_noise()
{
auto const mipmapped = [](GLenum const Target, GLenum const Format, glm::ivec3 const &Size) {
GLuint texture{0};
glCreateTextures(Target, 1, &texture);
auto const levels{static_cast<GLsizei>(std::floor(std::log2(static_cast<float>(std::max(Size.x, Size.y))))) + 1};
if (Target == GL_TEXTURE_3D)
glTextureStorage3D(texture, levels, Format, Size.x, Size.y, Size.z);
else
glTextureStorage2D(texture, levels, Format, Size.x, Size.y);
glTextureParameteri(texture, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
glTextureParameteri(texture, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTextureParameteri(texture, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTextureParameteri(texture, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTextureParameteri(texture, GL_TEXTURE_WRAP_R, GL_REPEAT);
return texture;
};
m_shape_noise = mipmapped(GL_TEXTURE_3D, GL_RGBA8, glm::ivec3{SHAPE_NOISE_SIZE});
m_detail_noise = mipmapped(GL_TEXTURE_3D, GL_RGBA8, glm::ivec3{DETAIL_NOISE_SIZE});
m_coverage_noise = mipmapped(GL_TEXTURE_2D, GL_RGBA8, glm::ivec3{COVERAGE_NOISE_SIZE, COVERAGE_NOISE_SIZE, 1});
m_noise_program->bind();
auto const make = [&](int const Kind, GLuint const Volume, int const Size) {
glBindImageTexture(0, Volume, 0, GL_TRUE, 0, GL_WRITE_ONLY, GL_RGBA8);
glBindImageTexture(1, m_coverage_noise, 0, GL_FALSE, 0, GL_WRITE_ONLY, GL_RGBA8);
glProgramUniform1i(*m_noise_program, 0, Kind);
glProgramUniform1i(*m_noise_program, 1, Size);
m_noise_program->dispatch(groups(Size), groups(Size), Kind == 2 ? 1 : static_cast<GLuint>(Size));
glMemoryBarrier(GL_TEXTURE_FETCH_BARRIER_BIT | GL_SHADER_IMAGE_ACCESS_BARRIER_BIT);
};
make(0, m_shape_noise, SHAPE_NOISE_SIZE);
make(1, m_detail_noise, DETAIL_NOISE_SIZE);
make(2, m_shape_noise, COVERAGE_NOISE_SIZE);
glBindImageTexture(0, 0, 0, GL_FALSE, 0, GL_WRITE_ONLY, GL_RGBA8);
glBindImageTexture(1, 0, 0, GL_FALSE, 0, GL_WRITE_ONLY, GL_RGBA8);
gl::program::unbind();
glGenerateTextureMipmap(m_shape_noise);
glGenerateTextureMipmap(m_detail_noise);
glGenerateTextureMipmap(m_coverage_noise);
}
void opengl46_weather::bind()
{
m_weather_ubo->bind_uniform();
if (m_shadow_map != 0)
glBindTextureUnit(gl::CLOUD_SHADOW_TEX, m_shadow_map);
if (m_fog_integrated != 0)
glBindTextureUnit(gl::FOG_VOLUME_TEX, m_fog_integrated);
}
void opengl46_weather::bind_noise() const
{
glBindTextureUnit(gl::CLOUD_SHAPE_TEX, m_shape_noise);
glBindTextureUnit(gl::CLOUD_DETAIL_TEX, m_detail_noise);
glBindTextureUnit(gl::CLOUD_COVERAGE_TEX, m_coverage_noise);
if (m_shadow_map != 0)
glBindTextureUnit(gl::CLOUD_SHADOW_TEX, m_shadow_map);
}
void opengl46_weather::upload_header()
{
// the colours of the horizon are left alone when the gpu writes them
auto const size{m_state.horizon_on_gpu() ? offsetof(gl::weather_ubs, fog_horizon) : sizeof(gl::weather_ubs)};
m_weather_ubo->update(reinterpret_cast<uint8_t const *>(&m_state.block()), 0, static_cast<GLsizeiptr>(size));
m_weather_ubo->bind_uniform();
}
void opengl46_weather::update(opengl46_sky const &Sky, glm::vec3 const &Keylight, glm::vec3 const &Keycolor, glm::vec3 const &Ambient, glm::vec3 const &Fogcolor, glm::dvec3 const &Camera)
{
m_state.update(Sky.atmosphere_weight(), Sky.skyview_table() != 0, Keylight, Keycolor, Ambient, Fogcolor, Camera);
auto const shadows{m_state.shadows_wanted()};
if (shadows)
{
if (m_shadow_size != Global.gfx_clouds_shadows_size)
{
release(m_shadow_map);
m_shadow_size = Global.gfx_clouds_shadows_size;
m_shadow_map = create_texture(GL_TEXTURE_2D, GL_R16F, glm::ivec3{m_shadow_size, m_shadow_size, 1}, GL_LINEAR, GL_CLAMP_TO_EDGE);
}
m_state.place_shadows(m_shadow_size, Camera);
}
upload_header();
if (m_state.horizon_on_gpu())
{
glBindTextureUnit(gl::SKY_VIEW_TEX, Sky.skyview_table());
glBindBufferBase(GL_SHADER_STORAGE_BUFFER, gl::WEATHER_SCRATCH_SSBO_BINDING, *m_weather_ubo);
glProgramUniform1i(*m_horizon_program, 0, static_cast<GLint>(offsetof(gl::weather_ubs, fog_horizon) / sizeof(glm::vec4)));
glProgramUniform4f(*m_horizon_program, 1, Sky.atmosphere_weight(), Sky.sky_scale(), 0.5f * Sky.overcast(), 64.f);
auto const &balance{Sky.white_balance()};
glProgramUniform3f(*m_horizon_program, 2, balance.r, balance.g, balance.b);
glProgramUniform3f(*m_horizon_program, 3, Fogcolor.r, Fogcolor.g, Fogcolor.b);
m_horizon_program->dispatch(1);
glMemoryBarrier(GL_UNIFORM_BARRIER_BIT);
glBindBufferBase(GL_SHADER_STORAGE_BUFFER, gl::WEATHER_SCRATCH_SSBO_BINDING, 0);
}
if (shadows)
{
m_shadow_timer.begin();
bind_noise();
glBindImageTexture(0, m_shadow_map, 0, GL_FALSE, 0, GL_WRITE_ONLY, GL_R16F);
glProgramUniform1i(*m_shadow_program, 1, m_shadow_size);
glProgramUniform3f(*m_shadow_program, 2, m_state.block().cloud_shadow_params.x, m_state.block().cloud_shadow_params.y, Global.gfx_clouds_shadows_range);
glProgramUniform1i(*m_shadow_program, 3, 8);
m_shadow_program->dispatch(groups(m_shadow_size), groups(m_shadow_size), 1);
glMemoryBarrier(GL_TEXTURE_FETCH_BARRIER_BIT | GL_SHADER_IMAGE_ACCESS_BARRIER_BIT);
glBindImageTexture(0, 0, 0, GL_FALSE, 0, GL_WRITE_ONLY, GL_R16F);
m_shadow_timer.end();
m_state.shadows_drawn(true);
upload_header();
}
else
m_state.shadows_drawn(false);
// a band of the panorama of the clouds, all of it the first time
if (m_state.clouds_drawn())
{
auto const level{gfx::weather_state::quality(Global.gfx_clouds, Global.gfx_fog_quality)};
if (m_panorama_size != level.panorama)
{
release(m_panorama);
m_panorama_size = level.panorama;
m_panorama = create_texture(GL_TEXTURE_2D, GL_RGBA16F, glm::ivec3{m_panorama_size, 1}, GL_LINEAR, GL_CLAMP_TO_EDGE);
glTextureParameteri(m_panorama, GL_TEXTURE_WRAP_S, GL_REPEAT);
m_state.panorama_resized();
}
int first, rows;
m_state.panorama_band(m_panorama_size, first, rows);
m_panorama_timer.begin();
bind_noise();
glBindImageTexture(0, m_panorama, 0, GL_FALSE, 0, GL_WRITE_ONLY, GL_RGBA16F);
// the depth isn't written in this mode, but something has to be bound
glBindImageTexture(1, m_panorama, 0, GL_FALSE, 0, GL_WRITE_ONLY, GL_RGBA16F);
glProgramUniform1i(*m_march_program, 0, 1);
glProgramUniform2i(*m_march_program, 1, m_panorama_size.x, m_panorama_size.y);
glProgramUniform1i(*m_march_program, 4, m_state.frame());
// the panorama is seen blurred: fewer samples
glProgramUniform4f(*m_march_program, 5, static_cast<float>(std::max(level.steps / 2, 24)), static_cast<float>(std::max(level.light_steps - 1, 2)), Global.gfx_clouds_distance, 0.f);
glProgramUniform2i(*m_march_program, 6, first, rows);
m_march_program->dispatch(groups(m_panorama_size.x), groups(rows), 1);
glMemoryBarrier(GL_TEXTURE_FETCH_BARRIER_BIT | GL_SHADER_IMAGE_ACCESS_BARRIER_BIT);
glBindImageTexture(0, 0, 0, GL_FALSE, 0, GL_WRITE_ONLY, GL_RGBA16F);
glBindImageTexture(1, 0, 0, GL_FALSE, 0, GL_WRITE_ONLY, GL_RGBA16F);
m_panorama_timer.end();
}
gl::program::unbind();
}
void opengl46_weather::prepare_view(glm::ivec2 const &Size, quality_level const &Level)
{
auto const cloudsize{glm::max((Size + Level.divisor - 1) / Level.divisor, glm::ivec2{1})};
if (m_state.clouds_drawn() && (cloudsize != m_view_size || m_clouds_color == 0))
{
for (auto *texture : {&m_clouds_color, &m_clouds_depth, &m_clouds_history[0], &m_clouds_history[1]})
release(*texture);
m_view_size = cloudsize;
m_clouds_color = create_texture(GL_TEXTURE_2D, GL_RGBA16F, glm::ivec3{m_view_size, 1}, GL_LINEAR, GL_CLAMP_TO_EDGE);
m_clouds_depth = create_texture(GL_TEXTURE_2D, GL_R32F, glm::ivec3{m_view_size, 1}, GL_NEAREST, GL_CLAMP_TO_EDGE);
for (auto &history : m_clouds_history)
history = create_texture(GL_TEXTURE_2D, GL_RGBA16F, glm::ivec3{m_view_size, 1}, GL_LINEAR, GL_CLAMP_TO_EDGE);
m_state.previous_clouds.valid = false;
}
if ((Global.gfx_fog == 1) && (Level.fog_grid != m_fog_grid || m_fog_integrated == 0))
{
for (auto *texture : {&m_fog_scattering[0], &m_fog_scattering[1], &m_fog_integrated})
release(*texture);
m_fog_grid = Level.fog_grid;
for (auto &scattering : m_fog_scattering)
scattering = create_texture(GL_TEXTURE_3D, GL_RGBA16F, m_fog_grid, GL_LINEAR, GL_CLAMP_TO_EDGE);
// one slice more: the fog through the whole volume without the clouds, which the sky takes (fog_integrate.comp)
m_fog_integrated = create_texture(GL_TEXTURE_3D, GL_RGBA16F, m_fog_grid + glm::ivec3{0, 0, 1}, GL_LINEAR, GL_CLAMP_TO_EDGE);
m_state.previous_fog.valid = false;
}
m_view_level = Level;
}
void opengl46_weather::render_view(glm::mat4 const &Projection, glm::mat4 const &View, glm::dvec3 const &Camera, glm::ivec2 const &Size, int const Cablamp)
{
auto const level{gfx::weather_state::quality(Global.gfx_clouds, Global.gfx_fog_quality)};
prepare_view(Size, level);
auto const rotation{glm::mat4{glm::mat3{View}}};
auto const inverseprojection{glm::inverse(Projection)};
auto const viewtoworld{glm::transpose(rotation)};
auto const projectionview{Projection * rotation};
auto &previousclouds{m_state.previous_clouds};
auto &previousfog{m_state.previous_fog};
if (m_state.clouds_drawn())
{
m_clouds_timer.begin();
bind_noise();
glBindImageTexture(0, m_clouds_color, 0, GL_FALSE, 0, GL_WRITE_ONLY, GL_RGBA16F);
glBindImageTexture(1, m_clouds_depth, 0, GL_FALSE, 0, GL_WRITE_ONLY, GL_R32F);
glProgramUniform1i(*m_march_program, 0, 0);
glProgramUniform2i(*m_march_program, 1, m_view_size.x, m_view_size.y);
glProgramUniformMatrix4fv(*m_march_program, 2, 1, GL_FALSE, glm::value_ptr(inverseprojection));
glProgramUniformMatrix4fv(*m_march_program, 3, 1, GL_FALSE, glm::value_ptr(viewtoworld));
glProgramUniform1i(*m_march_program, 4, m_state.frame());
glProgramUniform4f(*m_march_program, 5, static_cast<float>(level.steps), static_cast<float>(level.light_steps), Global.gfx_clouds_distance, level.detail ? 1.f : 0.f);
glProgramUniform2i(*m_march_program, 6, 0, m_view_size.y);
m_march_program->dispatch(groups(m_view_size.x), groups(m_view_size.y), 1);
glMemoryBarrier(GL_TEXTURE_FETCH_BARRIER_BIT | GL_SHADER_IMAGE_ACCESS_BARRIER_BIT);
auto const next{1 - m_clouds_current};
glBindTextureUnit(gl::CLOUD_TEX, m_clouds_color);
glBindTextureUnit(gl::CLOUD_SHAPE_TEX, m_clouds_depth);
glBindTextureUnit(gl::CLOUD_HISTORY_TEX, m_clouds_history[m_clouds_current]);
glBindImageTexture(0, m_clouds_history[next], 0, GL_FALSE, 0, GL_WRITE_ONLY, GL_RGBA16F);
glBindImageTexture(1, 0, 0, GL_FALSE, 0, GL_WRITE_ONLY, GL_R32F);
glProgramUniform2i(*m_temporal_program, 1, m_view_size.x, m_view_size.y);
glProgramUniformMatrix4fv(*m_temporal_program, 2, 1, GL_FALSE, glm::value_ptr(inverseprojection));
glProgramUniformMatrix4fv(*m_temporal_program, 3, 1, GL_FALSE, glm::value_ptr(viewtoworld));
glProgramUniformMatrix4fv(*m_temporal_program, 4, 1, GL_FALSE, glm::value_ptr(previousclouds.projection_view));
auto const previous{glm::vec3{previousclouds.camera - Camera}};
glProgramUniform3f(*m_temporal_program, 5, previous.x, previous.y, previous.z);
glProgramUniform1f(*m_temporal_program, 6, gfx::weather_state::continuity(previousclouds, Camera) ? 0.15f : 1.f);
m_temporal_program->dispatch(groups(m_view_size.x), groups(m_view_size.y), 1);
glMemoryBarrier(GL_TEXTURE_FETCH_BARRIER_BIT | GL_SHADER_IMAGE_ACCESS_BARRIER_BIT);
glBindImageTexture(0, 0, 0, GL_FALSE, 0, GL_WRITE_ONLY, GL_RGBA16F);
// the shape noise back where the clouds of the fog read it
glBindTextureUnit(gl::CLOUD_SHAPE_TEX, m_shape_noise);
m_clouds_current = next;
m_clouds_timer.end();
previousclouds = {projectionview, Camera, {}, true};
m_state.clouds_made();
}
else
previousclouds.valid = false;
if (Global.gfx_fog == 1)
{
m_fog_timer.begin();
auto const temporal{Global.gfx_fog_temporal && gfx::weather_state::continuity(previousfog, Camera)};
auto const jitter{m_state.fog_jitter(temporal)};
auto const slicing{gfx::weather_state::fog_slicing(m_fog_grid.z, jitter)};
bind_noise();
auto const next{1 - m_fog_current};
glBindImageTexture(0, m_fog_scattering[next], 0, GL_TRUE, 0, GL_WRITE_ONLY, GL_RGBA16F);
glBindTextureUnit(gl::CLOUD_HISTORY_TEX, m_fog_scattering[m_fog_current]);
glProgramUniform3i(*m_inject_program, 0, m_fog_grid.x, m_fog_grid.y, m_fog_grid.z);
glProgramUniformMatrix4fv(*m_inject_program, 1, 1, GL_FALSE, glm::value_ptr(inverseprojection));
glProgramUniformMatrix4fv(*m_inject_program, 2, 1, GL_FALSE, glm::value_ptr(viewtoworld));
glProgramUniform4fv(*m_inject_program, 3, 1, glm::value_ptr(slicing));
glProgramUniformMatrix4fv(*m_inject_program, 4, 1, GL_FALSE, glm::value_ptr(previousfog.projection_view));
auto const previous{glm::vec3{previousfog.camera - Camera}};
glProgramUniform3f(*m_inject_program, 5, previous.x, previous.y, previous.z);
auto const sunshadows{Global.gfx_fog_shadows && Global.gfx_shadowmap_enabled};
auto const share{temporal ? std::clamp(Global.gfx_fog_temporal_share, 0.02f, 1.f) : 1.f};
glProgramUniform4f(*m_inject_program, 6, share, Global.gfx_fog_lights, sunshadows ? 1.f : 0.f, Global.gfx_fog_shadows ? 1.f : 0.f);
glProgramUniform1i(*m_inject_program, 7, Cablamp);
glProgramUniform2f(*m_inject_program, 8, previousfog.slicing.x, previousfog.slicing.z);
glProgramUniform2f(*m_inject_program, 9, jitter.x, jitter.y);
m_inject_program->dispatch(groups(m_fog_grid.x), groups(m_fog_grid.y), static_cast<GLuint>(m_fog_grid.z));
glMemoryBarrier(GL_TEXTURE_FETCH_BARRIER_BIT | GL_SHADER_IMAGE_ACCESS_BARRIER_BIT);
glBindTextureUnit(gl::CLOUD_HISTORY_TEX, m_fog_scattering[next]);
glBindImageTexture(0, m_fog_integrated, 0, GL_TRUE, 0, GL_WRITE_ONLY, GL_RGBA16F);
glProgramUniform3i(*m_integrate_program, 0, m_fog_grid.x, m_fog_grid.y, m_fog_grid.z);
glProgramUniformMatrix4fv(*m_integrate_program, 1, 1, GL_FALSE, glm::value_ptr(inverseprojection));
glProgramUniformMatrix4fv(*m_integrate_program, 2, 1, GL_FALSE, glm::value_ptr(viewtoworld));
glProgramUniform4fv(*m_integrate_program, 3, 1, glm::value_ptr(slicing));
m_integrate_program->dispatch(groups(m_fog_grid.x), groups(m_fog_grid.y), 1);
glMemoryBarrier(GL_TEXTURE_FETCH_BARRIER_BIT | GL_SHADER_IMAGE_ACCESS_BARRIER_BIT);
glBindImageTexture(0, 0, 0, GL_FALSE, 0, GL_WRITE_ONLY, GL_RGBA16F);
m_fog_current = next;
m_fog_timer.end();
previousfog = {projectionview, Camera, slicing, true};
m_state.fog_made(slicing, m_fog_grid);
}
else
previousfog.valid = false;
gl::program::unbind();
}
void opengl46_weather::setup_pass(bool const Volume, glm::ivec2 const &Size)
{
m_state.setup_pass(Volume, Size);
upload_header();
bind();
}
void opengl46_weather::draw_stars(glm::mat4 const &View, float const Sunangle, double const Siderealtime, double const Latitude)
{
if (!m_stars_vao || m_stars_count == 0)
return;
glm::mat4 toworld, toview;
glm::vec4 params;
if (false == m_state.stars(Sunangle, Siderealtime, Latitude, View, toworld, toview, params))
return;
m_stars_program->bind();
glProgramUniformMatrix4fv(*m_stars_program, 0, 1, GL_FALSE, glm::value_ptr(toworld));
glProgramUniformMatrix4fv(*m_stars_program, 1, 1, GL_FALSE, glm::value_ptr(toview));
glProgramUniform4fv(*m_stars_program, 2, 1, glm::value_ptr(params));
glEnable(GL_PROGRAM_POINT_SIZE);
glBlendFunc(GL_ONE, GL_ONE);
m_stars_vao->bind();
glDrawArrays(GL_POINTS, 0, m_stars_count);
glDisable(GL_PROGRAM_POINT_SIZE);
gl::vao::unbind();
}
void opengl46_weather::draw_sky(glm::mat4 const &Projection, glm::mat4 const &View, bool const Mainview)
{
int mode{0};
if (m_state.clouds_drawn())
{
if (Mainview && m_state.clouds_view_valid())
{
mode = 1;
glBindTextureUnit(gl::CLOUD_TEX, m_clouds_history[m_clouds_current]);
}
else if (m_panorama != 0)
{
mode = 2;
glBindTextureUnit(gl::CLOUD_TEX, m_panorama);
}
}
auto const inverseprojection{glm::inverse(Projection)};
auto const viewtoworld{glm::transpose(glm::mat4{glm::mat3{View}})};
m_sky_program->bind();
glProgramUniformMatrix4fv(*m_sky_program, 0, 1, GL_FALSE, glm::value_ptr(inverseprojection));
glProgramUniformMatrix4fv(*m_sky_program, 1, 1, GL_FALSE, glm::value_ptr(viewtoworld));
glProgramUniform1i(*m_sky_program, 2, mode);
GLboolean depthmask;
glGetBooleanv(GL_DEPTH_WRITEMASK, &depthmask);
auto const depthtest{glIsEnabled(GL_DEPTH_TEST)};
auto const cull{glIsEnabled(GL_CULL_FACE)};
glDepthMask(GL_FALSE);
glDisable(GL_DEPTH_TEST);
glDisable(GL_CULL_FACE);
glEnable(GL_BLEND);
glBlendFunc(GL_ONE, GL_SRC_ALPHA);
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glDepthMask(depthmask);
if (depthtest)
glEnable(GL_DEPTH_TEST);
if (cull)
glEnable(GL_CULL_FACE);
}
std::string opengl46_weather::info_times()
{
std::string text;
auto const line = [&text](char const *Name, gl::gpu_timer &Timer) {
if (auto const time = Timer.result())
text += std::string{" "} + Name + ": " + to_string(static_cast<double>(*time) / 1000000.0, 3) + " ms\n";
};
line("clouds", m_clouds_timer);
line("clouds panorama", m_panorama_timer);
line("cloud shadows", m_shadow_timer);
line("fog volume", m_fog_timer);
return text;
}
void opengl46_weather::draw_debug_ui()
{
m_state.draw_debug_ui();
}
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