diff options
Diffstat (limited to 'gfx/models/texture.cpp')
| -rw-r--r-- | gfx/models/texture.cpp | 25 |
1 files changed, 16 insertions, 9 deletions
diff --git a/gfx/models/texture.cpp b/gfx/models/texture.cpp index 645920f..5b8d376 100644 --- a/gfx/models/texture.cpp +++ b/gfx/models/texture.cpp @@ -7,6 +7,7 @@ #include <glm/geometric.hpp>
#include <resource.h>
#include <stb/stb_image.h>
+#include <sys/mman.h>
Cache<Texture, std::filesystem::path> Texture::cachedTexture;
@@ -44,17 +45,23 @@ void Texture::save(const glTexture & texture, GLenum format, const glm::ivec2 & size, unsigned short channels,
const char * path, short tgaFormat)
{
- using PixelData = std::vector<unsigned char>;
- PixelData buffer(static_cast<size_t>(size.x * size.y * channels));
- glGetTextureImage(texture, 0, format, GL_UNSIGNED_BYTE, static_cast<GLsizei>(buffer.size()), buffer.data());
+ using TGAHead = std::array<short, 9>;
- auto out = open(path, O_WRONLY | O_CREAT, 0660);
- const short TGAhead[] = {0, tgaFormat, 0, 0, 0, 0, static_cast<short>(size.x), static_cast<short>(size.y),
- static_cast<short>(8 * channels)};
- std::ignore = write(out, &TGAhead, sizeof(TGAhead));
- std::ignore = write(out, buffer.data(), buffer.size());
- std::ignore = ftruncate(out, static_cast<off_t>(buffer.size() + sizeof(TGAhead)));
+ size_t dataSize = (static_cast<size_t>(size.x * size.y * channels));
+ size_t fileSize = dataSize + sizeof(TGAHead);
+
+ auto out = open(path, O_RDWR | O_CREAT, 0660);
+ std::ignore = ftruncate(out, static_cast<off_t>(fileSize));
+ TGAHead * tga = static_cast<TGAHead *>(mmap(nullptr, fileSize, PROT_WRITE, MAP_SHARED, out, 0));
close(out);
+ if (tga == MAP_FAILED) {
+ return;
+ }
+ *tga = {0, tgaFormat, 0, 0, 0, 0, static_cast<short>(size.x), static_cast<short>(size.y),
+ static_cast<short>(8 * channels)};
+ glGetTextureImage(texture, 0, format, GL_UNSIGNED_BYTE, static_cast<GLsizei>(dataSize), tga + 1);
+ msync(tga, fileSize, MS_ASYNC);
+ munmap(tga, fileSize);
}
void
|