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#include "glTexture.h"
#include "filesystem.h"
#include "gfx/models/tga.h"
#include <fcntl.h>
#include <ranges>
#include <sys/mman.h>
void
Impl::glTextureBase::bind(const GLuint unit) const
{
glBindTextureUnit(unit, name);
}
void
Impl::glTextureBase::generateMipmap()
{
glGenerateTextureMipmap(name);
}
template<glm::length_t Dims>
requires(Dims >= 1 && Dims <= 3)
glm::vec<Dims, GLsizei>
Impl::glTextureDims<Dims>::getSize() const
{
static constexpr std::array<GLenum, 3> PARAMS {GL_TEXTURE_WIDTH, GL_TEXTURE_HEIGHT, GL_TEXTURE_DEPTH};
glm::vec<Dims, GLsizei> size {};
for (auto [dim, param] : std::views::enumerate(PARAMS) | std::views::take(Dims)) {
glGetTextureLevelParameteriv(name, 0, param, &size[static_cast<glm::length_t>(dim)]);
}
return size;
}
template<>
void
Impl::glTextureDims<1>::storage(const GLsizei levels, const GLenum internalformat, glm::vec<1, GLsizei> dims)
{
glTextureStorage1D(name, levels, internalformat, dims.x);
}
template<>
void
Impl::glTextureDims<2>::storage(const GLsizei levels, const GLenum internalformat, glm::vec<2, GLsizei> dims)
{
glTextureStorage2D(name, levels, internalformat, dims.x, dims.y);
}
template<>
void
Impl::glTextureDims<3>::storage(const GLsizei levels, const GLenum internalformat, glm::vec<3, GLsizei> dims)
{
glTextureStorage3D(name, levels, internalformat, dims.x, dims.y, dims.z);
}
template<>
void
Impl::glTextureDims<1>::subImage(
glm::vec<1, GLint> offset, glm::vec<1, GLint> size, const GLenum format, const GLenum type, const void * pixels)
{
glTextureSubImage1D(name, 0, offset.x, size.x, format, type, pixels);
}
template<>
void
Impl::glTextureDims<2>::subImage(
glm::vec<2, GLint> offset, glm::vec<2, GLint> size, const GLenum format, const GLenum type, const void * pixels)
{
glTextureSubImage2D(name, 0, offset.x, offset.y, size.x, size.y, format, type, pixels);
}
template<>
void
Impl::glTextureDims<3>::subImage(
glm::vec<3, GLint> offset, glm::vec<3, GLint> size, const GLenum format, const GLenum type, const void * pixels)
{
glTextureSubImage3D(name, 0, offset.x, offset.y, offset.z, size.x, size.y, size.z, format, type, pixels);
}
template<glm::length_t Dims>
requires(Dims >= 1 && Dims <= 3)
void
Impl::glTextureDims<Dims>::image(
glm::vec<Dims, GLint> size, const GLenum format, const GLenum type, const void * pixels)
{
subImage({}, size, format, type, pixels);
}
template<glm::length_t Dims>
requires(Dims >= 1 && Dims <= 3)
void
Impl::glTextureDims<Dims>::image(const GLenum format, const GLenum type, const void * pixels)
{
image(getSize(), format, type, pixels);
}
namespace {
template<glm::length_t Dims>
requires(Dims >= 1 && Dims <= 3)
void
save(const Impl::glTextureDims<Dims> & texture, const GLenum format, const GLenum type, uint8_t channels,
const char * path, uint8_t tgaFormat)
{
const auto size = texture.getSize();
const auto area = [size]() {
size_t area = 1;
for (auto dim = 0; dim < Dims; ++dim) {
area *= static_cast<size_t>(size[dim]);
}
return area;
}();
size_t dataSize = area * channels;
const size_t fileSize = dataSize + sizeof(TGAHead);
filesystem::fh out {path, O_RDWR | O_CREAT, 0660};
out.truncate(fileSize);
auto tga = out.mmap(fileSize, 0, PROT_WRITE, MAP_SHARED);
*tga.get<TGAHead>() = {
.format = tgaFormat,
.size = {size.x, 1 * (area / static_cast<size_t>(size.x))},
.pixelDepth = static_cast<uint8_t>(8 * channels),
};
glPixelStorei(GL_PACK_ALIGNMENT, 1);
glGetTextureImage(texture, 0, format, type, static_cast<GLsizei>(dataSize), tga.get<TGAHead>() + 1);
tga.msync(MS_ASYNC);
}
}
template<glm::length_t Dims>
requires(Dims >= 1 && Dims <= 3)
void
Impl::glTextureDims<Dims>::saveColour(const char * path) const
{
save(*this, GL_BGR, GL_UNSIGNED_BYTE, 3, path, 2);
}
template<glm::length_t Dims>
requires(Dims >= 1 && Dims <= 3)
void
Impl::glTextureDims<Dims>::savePosition(const char * path) const
{
save(*this, GL_BGR_INTEGER, GL_UNSIGNED_BYTE, 3, path, 2);
}
template<glm::length_t Dims>
requires(Dims >= 1 && Dims <= 3)
void
Impl::glTextureDims<Dims>::saveDepth(const char * path) const
{
save(*this, GL_DEPTH_COMPONENT, GL_UNSIGNED_BYTE, 1, path, 3);
}
template<glm::length_t Dims>
requires(Dims >= 1 && Dims <= 3)
void
Impl::glTextureDims<Dims>::saveNormal(const char * path) const
{
save(*this, GL_BGR, GL_BYTE, 3, path, 2);
}
template struct Impl::glTextureDims<1>;
template struct Impl::glTextureDims<2>;
template struct Impl::glTextureDims<3>;
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