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[Feature, Fix, Test] (GLState, GLImpl, DirectVulkan, DirectGLES): implement glTextureView over shared texture storage

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swung0x48
2026-08-22 10:41:52 -04:00
parent a5f36c8f8d
commit 6162603072
36 changed files with 2995 additions and 68 deletions
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MobileGL/MG_State/GLState/TextureState/TextureObject.h
+41
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@@ -78,6 +78,29 @@ namespace MobileGL::MG_State::GLState {
virtual GLenum GetDepthStencilTextureMode() const = 0;
virtual void SetDepthStencilTextureMode(GLenum mode) = 0;
// ---- Texture views (ARB_texture_view / GL 4.6 core 8.18) ----
// The texture object whose immutable storage this one's texels actually live in, or
// nullptr when this texture owns its storage. It is itself NEVER a view: glTextureView
// composes a view-of-a-view onto the ROOT at creation, which is exactly what the spec's
// additive "<minlevel> plus the value of TEXTURE_VIEW_MIN_LEVEL from the original
// texture" rule describes, so one hop always reaches the storage.
//
// Holding it as a SharedPtr is what gives GL's name-deletion semantics for free: after
// glDeleteTextures(origtexture) the name is gone and TextureState has dropped its entry,
// but the object - and therefore the storage and every backend resource keyed on it -
// stays alive as long as some view still references it (GL 4.6 core 5.1.2).
virtual const SharedPtr<ITextureObject>& GetViewStorageOwner() const = 0;
Bool IsTextureView() const { return GetViewStorageOwner() != nullptr; }
// GL 4.6 core table 23.17, expressed in the storage owner's level/layer coordinates
// (see above - composition makes the two the same number). All four are 0 on a mutable
// texture; TexStorage* seeds them with (0, levels, 0, layers) because the spec makes an
// immutable texture a full-extent view of itself, and glTextureView composes onto those.
virtual Uint GetViewMinLevel() const = 0;
virtual Uint GetViewNumLevels() const = 0;
virtual Uint GetViewMinLayer() const = 0;
virtual Uint GetViewNumLayers() const = 0;
virtual void SetViewLevelLayerRange(Uint minLevel, Uint numLevels, Uint minLayer, Uint numLayers) = 0;
protected:
virtual Uint GetIndexOfTextureUploadTarget(TextureUploadTarget target) const = 0;
};
@@ -123,6 +146,18 @@ namespace MobileGL::MG_State::GLState {
Bool HasFixedSampleLocations() const override;
void SetFixedSampleLocations(Bool fixedSampleLocations) override;
Uint64 GetLifetimeId() const override;
// A plain texture owns its storage; TextureObjectView overrides this.
const SharedPtr<ITextureObject>& GetViewStorageOwner() const override;
Uint GetViewMinLevel() const override { return m_viewMinLevel; }
Uint GetViewNumLevels() const override { return m_viewNumLevels; }
Uint GetViewMinLayer() const override { return m_viewMinLayer; }
Uint GetViewNumLayers() const override { return m_viewNumLayers; }
void SetViewLevelLayerRange(Uint minLevel, Uint numLevels, Uint minLayer, Uint numLayers) override {
m_viewMinLevel = minLevel;
m_viewNumLevels = numLevels;
m_viewMinLayer = minLayer;
m_viewNumLayers = numLayers;
}
GLenum GetDepthStencilTextureMode() const override { return m_depthStencilTextureMode; }
// Bumps the params version like every other backend-visible texture parameter: the mode
// decides which ASPECT of a packed depth/stencil image a sampler reads, which DirectGLES
@@ -165,6 +200,12 @@ namespace MobileGL::MG_State::GLState {
// matches before its first sync. Bumped only on dirty=true in MarkStorageDirty.
Uint64 m_contentVersion = 1;
GLenum m_depthStencilTextureMode = GL_DEPTH_COMPONENT;
// GL 4.6 core table 23.17: all four are 0 until immutable storage exists, which is what
// makes glGetTexParameteriv(GL_TEXTURE_VIEW_NUM_LEVELS) answer 0 on a mutable texture.
Uint m_viewMinLevel = 0;
Uint m_viewNumLevels = 0;
Uint m_viewMinLayer = 0;
Uint m_viewNumLayers = 0;
Int m_samples = 0;
Bool m_fixedSampleLocations = true;
};