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Force default image loader to use 32-bit images for Vulkan compatibility.

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This commit is contained in:
Victor Bushong 2018-08-22 22:03:30 -05:00
parent 1d0bd6c64f
commit 18ef338ff5
1 changed files with 10 additions and 5 deletions
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15
tiny_gltf.h
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@ -1314,14 +1314,19 @@ bool LoadImageData(Image *image, std::string *err, std::string *warn,
int size, void *) {
(void)warn;
int w, h, comp;
int w, h, comp, req_comp;
// force 32-bit textures for common Vulkan compatibility. It appears that
// some GPU drivers do not support 24-bit images for Vulkan
req_comp = 4;
// if image cannot be decoded, ignore parsing and keep it by its path
// don't break in this case
// FIXME we should only enter this function if the image is embedded. If
// image->uri references
// an image file, it should be left as it is. Image loading should not be
// mandatory (to support other formats)
unsigned char *data = stbi_load_from_memory(bytes, size, &w, &h, &comp, 0);
unsigned char *data = stbi_load_from_memory(bytes, size, &w, &h, &comp, req_comp);
if (!data) {
// NOTE: you can use `warn` instead of `err`
if (err) {
@ -1360,9 +1365,9 @@ bool LoadImageData(Image *image, std::string *err, std::string *warn,
image->width = w;
image->height = h;
image->component = comp;
image->image.resize(static_cast<size_t>(w * h * comp));
std::copy(data, data + w * h * comp, image->image.begin());
image->component = req_comp;
image->image.resize(static_cast<size_t>(w * h * req_comp));
std::copy(data, data + w * h * req_comp, image->image.begin());
free(data);