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gs-mipmapper: Fix support for very small mipmaps

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This fixes the final mip map of a texture being empty, in cases where either width or height is reduced to just a single pixel.
This commit is contained in:
Michael Fabian 'Xaymar' Dirks 2018-09-29 16:57:17 +02:00
parent 38b6ec7c65
commit 9a8a44045b
1 changed files with 11 additions and 4 deletions
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15
source/gs-mipmapper.cpp
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@ -184,8 +184,8 @@ void gs::mipmapper::rebuild(std::shared_ptr<gs::texture> source, std::shared_ptr
size_t mip_levels = 1;
#if defined(WIN32) || defined(WIN64)
ID3D11Texture2D* target_t2;
ID3D11Texture2D* source_t2;
ID3D11Texture2D* target_t2 = nullptr;
ID3D11Texture2D* source_t2 = nullptr;
if (device_type == GS_DEVICE_DIRECT3D_11) {
// We definitely have a Direct3D11 resource.
D3D11_TEXTURE2D_DESC target_t2desc;
@ -209,8 +209,15 @@ void gs::mipmapper::rebuild(std::shared_ptr<gs::texture> source, std::shared_ptr
for (size_t mip = 1; mip < mip_levels; mip++) {
texture_width /= 2;
texture_height /= 2;
texel_width *= 2;
texel_height *= 2;
if (texture_width == 0) {
texture_width = 1;
}
if (texture_height == 0) {
texture_height = 1;
}
texel_width = 1.0 / texture_width;
texel_height = 1.0 / texture_height;
// Draw mipmap layer
try {