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gpu: implement automatic mipmaps for images

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All GPU APIs except OpenGL ES 2 can generate mipmaps for textures.
This trades 33% more GPU memory use for improved rendering quality
and speed for downscaled images.

Signed-off-by: Elias Naur <mail@eliasnaur.com>
This commit is contained in:
Elias Naur
2022-10-22 11:04:22 -06:00
parent e69ef4f0b4
commit bebc73db37
19 changed files with 233 additions and 38 deletions
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gpu/internal/d3d11/d3d11_windows.go
+26 -3
View File
@@ -7,6 +7,7 @@ import (
"fmt"
"image"
"math"
"math/bits"
"unsafe"
"golang.org/x/sys/windows"
@@ -58,6 +59,7 @@ type Texture struct {
width int
height int
mipmap bool
foreign bool
}
@@ -219,17 +221,33 @@ func (b *Backend) NewTexture(format driver.TextureFormat, width, height int, min
default:
return nil, fmt.Errorf("unsupported texture format %d", format)
}
bindFlags := convBufferBinding(bindings)
miscFlags := uint32(0)
mipmap := minFilter == driver.FilterLinearMipmapLinear
nmipmaps := 1
if mipmap {
// Flags required by ID3D11DeviceContext::GenerateMips.
bindFlags |= d3d11.BIND_SHADER_RESOURCE | d3d11.BIND_RENDER_TARGET
miscFlags |= d3d11.RESOURCE_MISC_GENERATE_MIPS
dim := width
if height > dim {
dim = height
}
log2 := 32 - bits.LeadingZeros32(uint32(dim)) - 1
nmipmaps = log2 + 1
}
tex, err := b.dev.CreateTexture2D(&d3d11.TEXTURE2D_DESC{
Width: uint32(width),
Height: uint32(height),
MipLevels: 1,
MipLevels: uint32(nmipmaps),
ArraySize: 1,
Format: d3dfmt,
SampleDesc: d3d11.DXGI_SAMPLE_DESC{
Count: 1,
Quality: 0,
},
BindFlags: convBufferBinding(bindings),
BindFlags: bindFlags,
MiscFlags: miscFlags,
})
if err != nil {
return nil, err
@@ -247,6 +265,8 @@ func (b *Backend) NewTexture(format driver.TextureFormat, width, height int, min
filter = d3d11.FILTER_MIN_MAG_MIP_POINT
case minFilter == driver.FilterLinear && magFilter == driver.FilterLinear:
filter = d3d11.FILTER_MIN_MAG_LINEAR_MIP_POINT
case minFilter == driver.FilterLinearMipmapLinear && magFilter == driver.FilterLinear:
filter = d3d11.FILTER_MIN_MAG_MIP_LINEAR
default:
d3d11.IUnknownRelease(unsafe.Pointer(tex), tex.Vtbl.Release)
return nil, fmt.Errorf("unsupported texture filter combination %d, %d", minFilter, magFilter)
@@ -325,7 +345,7 @@ func (b *Backend) NewTexture(format driver.TextureFormat, width, height int, min
return nil, err
}
}
return &Texture{backend: b, format: d3dfmt, tex: tex, sampler: sampler, resView: resView, uaView: uaView, renderTarget: fbo, bindings: bindings, width: width, height: height}, nil
return &Texture{backend: b, format: d3dfmt, tex: tex, sampler: sampler, resView: resView, uaView: uaView, renderTarget: fbo, bindings: bindings, width: width, height: height, mipmap: mipmap}, nil
}
func (b *Backend) newInputLayout(vertexShader shader.Sources, layout []driver.InputDesc) (*d3d11.InputLayout, error) {
@@ -609,6 +629,9 @@ func (t *Texture) Upload(offset, size image.Point, pixels []byte, stride int) {
}
res := (*d3d11.Resource)(unsafe.Pointer(t.tex))
t.backend.ctx.UpdateSubresource(res, dst, uint32(stride), uint32(len(pixels)), pixels)
if t.mipmap {
t.backend.ctx.GenerateMips(t.resView)
}
}
func (t *Texture) Release() {