summaryrefslogtreecommitdiffstats
path: root/dom/canvas/WebGLFormats.h
diff options
context:
space:
mode:
Diffstat (limited to 'dom/canvas/WebGLFormats.h')
-rw-r--r--dom/canvas/WebGLFormats.h349
1 files changed, 349 insertions, 0 deletions
diff --git a/dom/canvas/WebGLFormats.h b/dom/canvas/WebGLFormats.h
new file mode 100644
index 000000000..41d89e063
--- /dev/null
+++ b/dom/canvas/WebGLFormats.h
@@ -0,0 +1,349 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef WEBGL_FORMATS_H_
+#define WEBGL_FORMATS_H_
+
+#include <map>
+#include <set>
+
+#include "mozilla/UniquePtr.h"
+#include "WebGLTypes.h"
+
+namespace mozilla {
+namespace webgl {
+
+typedef uint8_t EffectiveFormatValueT;
+
+enum class EffectiveFormat : EffectiveFormatValueT {
+ // GLES 3.0.4, p128-129, "Required Texture Formats"
+ // "Texture and renderbuffer color formats"
+ RGBA32I,
+ RGBA32UI,
+ RGBA16I,
+ RGBA16UI,
+ RGBA8,
+ RGBA8I,
+ RGBA8UI,
+ SRGB8_ALPHA8,
+ RGB10_A2,
+ RGB10_A2UI,
+ RGBA4,
+ RGB5_A1,
+
+ RGB8,
+ RGB565,
+
+ RG32I,
+ RG32UI,
+ RG16I,
+ RG16UI,
+ RG8,
+ RG8I,
+ RG8UI,
+
+ R32I,
+ R32UI,
+ R16I,
+ R16UI,
+ R8,
+ R8I,
+ R8UI,
+
+ // "Texture-only color formats"
+ RGBA32F,
+ RGBA16F,
+ RGBA8_SNORM,
+
+ RGB32F,
+ RGB32I,
+ RGB32UI,
+
+ RGB16F,
+ RGB16I,
+ RGB16UI,
+
+ RGB8_SNORM,
+ RGB8I,
+ RGB8UI,
+ SRGB8,
+
+ R11F_G11F_B10F,
+ RGB9_E5,
+
+ RG32F,
+ RG16F,
+ RG8_SNORM,
+
+ R32F,
+ R16F,
+ R8_SNORM,
+
+ // "Depth formats"
+ DEPTH_COMPONENT32F,
+ DEPTH_COMPONENT24,
+ DEPTH_COMPONENT16,
+
+ // "Combined depth+stencil formats"
+ DEPTH32F_STENCIL8,
+ DEPTH24_STENCIL8,
+
+ // GLES 3.0.4, p205-206, "Required Renderbuffer Formats"
+ STENCIL_INDEX8,
+
+ ////////////////////////////////////
+
+ // GLES 3.0.4, p147, table 3.19
+ // GLES 3.0.4, p286+, $C.1 "ETC Compressed Texture Image Formats"
+ COMPRESSED_R11_EAC,
+ COMPRESSED_SIGNED_R11_EAC,
+ COMPRESSED_RG11_EAC,
+ COMPRESSED_SIGNED_RG11_EAC,
+ COMPRESSED_RGB8_ETC2,
+ COMPRESSED_SRGB8_ETC2,
+ COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2,
+ COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2,
+ COMPRESSED_RGBA8_ETC2_EAC,
+ COMPRESSED_SRGB8_ALPHA8_ETC2_EAC,
+
+ // AMD_compressed_ATC_texture
+ ATC_RGB_AMD,
+ ATC_RGBA_EXPLICIT_ALPHA_AMD,
+ ATC_RGBA_INTERPOLATED_ALPHA_AMD,
+
+ // EXT_texture_compression_s3tc
+ COMPRESSED_RGB_S3TC_DXT1_EXT,
+ COMPRESSED_RGBA_S3TC_DXT1_EXT,
+ COMPRESSED_RGBA_S3TC_DXT3_EXT,
+ COMPRESSED_RGBA_S3TC_DXT5_EXT,
+
+ // IMG_texture_compression_pvrtc
+ COMPRESSED_RGB_PVRTC_4BPPV1,
+ COMPRESSED_RGBA_PVRTC_4BPPV1,
+ COMPRESSED_RGB_PVRTC_2BPPV1,
+ COMPRESSED_RGBA_PVRTC_2BPPV1,
+
+ // OES_compressed_ETC1_RGB8_texture
+ ETC1_RGB8_OES,
+
+ ////////////////////////////////////
+
+ // GLES 3.0.4, p128, table 3.12.
+ Luminance8Alpha8,
+ Luminance8,
+ Alpha8,
+
+ // OES_texture_float
+ Luminance32FAlpha32F,
+ Luminance32F,
+ Alpha32F,
+
+ // OES_texture_half_float
+ Luminance16FAlpha16F,
+ Luminance16F,
+ Alpha16F,
+
+ MAX,
+};
+
+enum class UnsizedFormat : uint8_t {
+ R,
+ RG,
+ RGB,
+ RGBA,
+ LA,
+ L,
+ A,
+ D,
+ S,
+ DEPTH_STENCIL, // `DS` is a macro on Solaris. (regset.h)
+};
+
+// GLES 3.0.4 p114 Table 3.4, p240
+enum class ComponentType : uint8_t {
+ None,
+ Int, // RGBA32I
+ UInt, // RGBA32UI, STENCIL_INDEX8
+ NormInt, // RGBA8_SNORM
+ NormUInt, // RGBA8, DEPTH_COMPONENT16
+ Float, // RGBA32F
+ Special, // DEPTH24_STENCIL8
+};
+
+enum class CompressionFamily : uint8_t {
+ ETC1,
+ ES3, // ETC2 or EAC
+ ATC,
+ S3TC,
+ PVRTC,
+};
+
+////////////////////////////////////////////////////////////////////////////////
+
+struct CompressedFormatInfo
+{
+ const EffectiveFormat effectiveFormat;
+ const uint8_t bytesPerBlock;
+ const uint8_t blockWidth;
+ const uint8_t blockHeight;
+ const CompressionFamily family;
+};
+
+struct FormatInfo
+{
+ const EffectiveFormat effectiveFormat;
+ const char* const name;
+ const GLenum sizedFormat;
+ const UnsizedFormat unsizedFormat;
+ const ComponentType componentType;
+ const bool isSRGB;
+
+ const CompressedFormatInfo* const compression;
+
+ const uint8_t estimatedBytesPerPixel; // 0 iff bool(compression).
+
+ // In bits. Iff bool(compression), active channels are 1.
+ const uint8_t r;
+ const uint8_t g;
+ const uint8_t b;
+ const uint8_t a;
+ const uint8_t d;
+ const uint8_t s;
+
+ //////
+
+ std::map<UnsizedFormat, const FormatInfo*> copyDecayFormats;
+
+ const FormatInfo* GetCopyDecayFormat(UnsizedFormat) const;
+
+ bool IsColorFormat() const {
+ // Alpha is a 'color format' since it's 'color-attachable'.
+ return bool(compression) ||
+ bool(r | g | b | a);
+ }
+};
+
+struct PackingInfo
+{
+ GLenum format;
+ GLenum type;
+
+ bool operator <(const PackingInfo& x) const
+ {
+ if (format != x.format)
+ return format < x.format;
+
+ return type < x.type;
+ }
+
+ bool operator ==(const PackingInfo& x) const {
+ return (format == x.format &&
+ type == x.type);
+ }
+};
+
+struct DriverUnpackInfo
+{
+ GLenum internalFormat;
+ GLenum unpackFormat;
+ GLenum unpackType;
+
+ PackingInfo ToPacking() const {
+ return {unpackFormat, unpackType};
+ }
+};
+
+//////////////////////////////////////////////////////////////////////////////////////////
+
+const FormatInfo* GetFormat(EffectiveFormat format);
+uint8_t BytesPerPixel(const PackingInfo& packing);
+bool GetBytesPerPixel(const PackingInfo& packing, uint8_t* const out_bytes);
+/*
+GLint ComponentSize(const FormatInfo* format, GLenum component);
+GLenum ComponentType(const FormatInfo* format);
+*/
+////////////////////////////////////////
+
+struct FormatUsageInfo
+{
+ const FormatInfo* const format;
+private:
+ bool isRenderable;
+public:
+ bool isFilterable;
+
+ std::map<PackingInfo, DriverUnpackInfo> validUnpacks;
+ const DriverUnpackInfo* idealUnpack;
+
+ const GLint* textureSwizzleRGBA;
+
+ bool maxSamplesKnown;
+ uint32_t maxSamples;
+
+ static const GLint kLuminanceSwizzleRGBA[4];
+ static const GLint kAlphaSwizzleRGBA[4];
+ static const GLint kLumAlphaSwizzleRGBA[4];
+
+ explicit FormatUsageInfo(const FormatInfo* _format)
+ : format(_format)
+ , isRenderable(false)
+ , isFilterable(false)
+ , idealUnpack(nullptr)
+ , textureSwizzleRGBA(nullptr)
+ , maxSamplesKnown(false)
+ , maxSamples(0)
+ { }
+
+ bool IsRenderable() const { return isRenderable; }
+ void SetRenderable();
+
+ bool IsUnpackValid(const PackingInfo& key,
+ const DriverUnpackInfo** const out_value) const;
+
+ void ResolveMaxSamples(gl::GLContext* gl);
+};
+
+class FormatUsageAuthority
+{
+ std::map<EffectiveFormat, FormatUsageInfo> mUsageMap;
+
+ std::map<GLenum, const FormatUsageInfo*> mRBFormatMap;
+ std::map<GLenum, const FormatUsageInfo*> mSizedTexFormatMap;
+ std::map<PackingInfo, const FormatUsageInfo*> mUnsizedTexFormatMap;
+
+ std::set<GLenum> mValidTexInternalFormats;
+ std::set<GLenum> mValidTexUnpackFormats;
+ std::set<GLenum> mValidTexUnpackTypes;
+
+public:
+ static UniquePtr<FormatUsageAuthority> CreateForWebGL1(gl::GLContext* gl);
+ static UniquePtr<FormatUsageAuthority> CreateForWebGL2(gl::GLContext* gl);
+
+private:
+ FormatUsageAuthority() { }
+
+public:
+ FormatUsageInfo* EditUsage(EffectiveFormat format);
+ const FormatUsageInfo* GetUsage(EffectiveFormat format) const;
+
+ void AddTexUnpack(FormatUsageInfo* usage, const PackingInfo& pi,
+ const DriverUnpackInfo& dui);
+
+ bool IsInternalFormatEnumValid(GLenum internalFormat) const;
+ bool AreUnpackEnumsValid(GLenum unpackFormat, GLenum unpackType) const;
+
+ void AllowRBFormat(GLenum sizedFormat, const FormatUsageInfo* usage);
+ void AllowSizedTexFormat(GLenum sizedFormat, const FormatUsageInfo* usage);
+ void AllowUnsizedTexFormat(const PackingInfo& pi, const FormatUsageInfo* usage);
+
+ const FormatUsageInfo* GetRBUsage(GLenum sizedFormat) const;
+ const FormatUsageInfo* GetSizedTexUsage(GLenum sizedFormat) const;
+ const FormatUsageInfo* GetUnsizedTexUsage(const PackingInfo& pi) const;
+};
+
+} // namespace webgl
+} // namespace mozilla
+
+#endif // WEBGL_FORMATS_H_