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Code Issues 156 Wiki Activity

Shade the sky and the sun by the scenery around the camera instead of the track environment flags

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Hirek
2026-10-27 16:02:36 +01:00
parent 9dde5b0e5e
commit 2a876befb0
35 changed files with 2351 additions and 55 deletions
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97
rendering/opengl46/opengl46skyocclusion.cpp Normal file
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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/opengl46skyocclusion.h"
#include "gl/ubo.h"
namespace
{
// a toroidal map read texel by texel (textureGather): nearest, repeated
GLuint make_map(GLenum const Format, int const Side)
{
GLuint texture{0};
glCreateTextures(GL_TEXTURE_2D, 1, &texture);
glTextureStorage2D(texture, 1, Format, Side, Side);
glTextureParameteri(texture, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTextureParameteri(texture, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTextureParameteri(texture, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTextureParameteri(texture, GL_TEXTURE_WRAP_T, GL_REPEAT);
return texture;
}
} // namespace
opengl46_sky_occlusion::~opengl46_sky_occlusion()
{
gpu_release();
if (m_emptyheights != 0)
glDeleteTextures(1, &m_emptyheights);
if (m_emptyocclusion != 0)
glDeleteTextures(1, &m_emptyocclusion);
}
void opengl46_sky_occlusion::init()
{
// a sampler with no texture to read from is undefined, also where the shading doesn't read it
m_emptyheights = make_map(GL_R32F, 1);
float const none{-1.0e4f};
glClearTexImage(m_emptyheights, 0, GL_RED, GL_FLOAT, &none);
m_emptyocclusion = make_map(GL_RGBA16F, 1);
float const open[4]{1.f, 1.f, -1000.f, 1000.f};
glClearTexImage(m_emptyocclusion, 0, GL_RGBA, GL_FLOAT, open);
bind();
}
void opengl46_sky_occlusion::bind() const
{
glBindTextureUnit(gl::SKY_OCCLUSION_HEIGHT_TEX, (m_heights != 0) ? m_heights : m_emptyheights);
glBindTextureUnit(gl::SKY_OCCLUSION_TEX, (m_occlusion != 0) ? m_occlusion : m_emptyocclusion);
}
bool opengl46_sky_occlusion::gpu_allocate(int const Side)
{
gpu_release();
m_heights = make_map(GL_R32F, Side);
m_occlusion = make_map(GL_RGBA16F, Side);
if ((m_heights == 0) || (m_occlusion == 0))
return false;
bind();
return true;
}
void opengl46_sky_occlusion::gpu_release()
{
if (m_heights != 0)
glDeleteTextures(1, &m_heights);
if (m_occlusion != 0)
glDeleteTextures(1, &m_occlusion);
m_heights = 0;
m_occlusion = 0;
if (m_emptyheights != 0)
bind();
}
void opengl46_sky_occlusion::gpu_upload(int const X, int const Y, int const Size, float const *Heights, std::uint16_t const *Occlusion)
{
if ((m_heights == 0) || (m_occlusion == 0))
return;
// from the memory of the process: the buffer the texture streaming may have bound and the alignment are put back after
GLint unpack{0}, alignment{4};
glGetIntegerv(GL_PIXEL_UNPACK_BUFFER_BINDING, &unpack);
glGetIntegerv(GL_UNPACK_ALIGNMENT, &alignment);
glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
glTextureSubImage2D(m_heights, 0, X, Y, Size, Size, GL_RED, GL_FLOAT, Heights);
glTextureSubImage2D(m_occlusion, 0, X, Y, Size, Size, GL_RGBA, GL_HALF_FLOAT, Occlusion);
glBindBuffer(GL_PIXEL_UNPACK_BUFFER, static_cast<GLuint>(unpack));
glPixelStorei(GL_UNPACK_ALIGNMENT, alignment);
}