1 files changed, 122 insertions, 0 deletions
diff --git a/dom/canvas/WebGLExtensionTextureFloat.cpp b/dom/canvas/WebGLExtensionTextureFloat.cpp
new file mode 100644
index 000000000..4568e994e
--- /dev/null
+++ b/dom/canvas/WebGLExtensionTextureFloat.cpp
@@ -0,0 +1,122 @@
+/* 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/. */
+
+#include "WebGLExtensions.h"
+
+#include "GLContext.h"
+#include "mozilla/dom/WebGLRenderingContextBinding.h"
+#include "WebGLContext.h"
+#include "WebGLFormats.h"
+
+namespace mozilla {
+
+WebGLExtensionTextureFloat::WebGLExtensionTextureFloat(WebGLContext* webgl)
+    : WebGLExtensionBase(webgl)
+{
+    MOZ_ASSERT(IsSupported(webgl));
+
+    auto& fua = webgl->mFormatUsage;
+    gl::GLContext* gl = webgl->GL();
+
+    webgl::PackingInfo pi;
+    webgl::DriverUnpackInfo dui;
+    const GLint* swizzle = nullptr;
+
+    const auto fnAdd = [&fua, &pi, &dui, &swizzle](webgl::EffectiveFormat effFormat)
+    {
+        auto usage = fua->EditUsage(effFormat);
+        usage->textureSwizzleRGBA = swizzle;
+        fua->AddTexUnpack(usage, pi, dui);
+
+        fua->AllowUnsizedTexFormat(pi, usage);
+    };
+
+    const bool needsSwizzle = gl->IsCoreProfile();
+    MOZ_ASSERT_IF(needsSwizzle, gl->IsSupported(gl::GLFeature::texture_swizzle));
+
+    const bool needsSizedFormat = !gl->IsGLES();
+
+    ////////////////
+
+    pi = {LOCAL_GL_RGBA, LOCAL_GL_FLOAT};
+    dui = {pi.format, pi.format, pi.type};
+    swizzle = nullptr;
+    if (needsSizedFormat) {
+        dui.internalFormat = LOCAL_GL_RGBA32F;
+    }
+    fnAdd(webgl::EffectiveFormat::RGBA32F);
+
+    //////
+
+    pi = {LOCAL_GL_RGB, LOCAL_GL_FLOAT};
+    dui = {pi.format, pi.format, pi.type};
+    swizzle = nullptr;
+    if (needsSizedFormat) {
+        dui.internalFormat = LOCAL_GL_RGB32F;
+    }
+    fnAdd(webgl::EffectiveFormat::RGB32F);
+
+    //////
+
+    pi = {LOCAL_GL_LUMINANCE, LOCAL_GL_FLOAT};
+    dui = {pi.format, pi.format, pi.type};
+    swizzle = nullptr;
+    if (needsSwizzle) {
+        dui = {LOCAL_GL_R32F, LOCAL_GL_RED, LOCAL_GL_FLOAT};
+        swizzle = webgl::FormatUsageInfo::kLuminanceSwizzleRGBA;
+    } else if (needsSizedFormat) {
+        dui.internalFormat = LOCAL_GL_LUMINANCE32F_ARB;
+    }
+    fnAdd(webgl::EffectiveFormat::Luminance32F);
+
+    //////
+
+    pi = {LOCAL_GL_ALPHA, LOCAL_GL_FLOAT};
+    dui = {pi.format, pi.format, pi.type};
+    swizzle = nullptr;
+    if (needsSwizzle) {
+        dui = {LOCAL_GL_R32F, LOCAL_GL_RED, LOCAL_GL_FLOAT};
+        swizzle = webgl::FormatUsageInfo::kAlphaSwizzleRGBA;
+    } else if (needsSizedFormat) {
+        dui.internalFormat = LOCAL_GL_ALPHA32F_ARB;
+    }
+    fnAdd(webgl::EffectiveFormat::Alpha32F);
+
+    //////
+
+    pi = {LOCAL_GL_LUMINANCE_ALPHA, LOCAL_GL_FLOAT};
+    dui = {pi.format, pi.format, pi.type};
+    swizzle = nullptr;
+    if (needsSwizzle) {
+        dui = {LOCAL_GL_RG32F, LOCAL_GL_RG, LOCAL_GL_FLOAT};
+        swizzle = webgl::FormatUsageInfo::kLumAlphaSwizzleRGBA;
+    } else if (needsSizedFormat) {
+        dui.internalFormat = LOCAL_GL_LUMINANCE_ALPHA32F_ARB;
+    }
+    fnAdd(webgl::EffectiveFormat::Luminance32FAlpha32F);
+}
+
+WebGLExtensionTextureFloat::~WebGLExtensionTextureFloat()
+{
+}
+
+bool
+WebGLExtensionTextureFloat::IsSupported(const WebGLContext* webgl)
+{
+    gl::GLContext* gl = webgl->GL();
+
+    if (!gl->IsSupported(gl::GLFeature::texture_float))
+        return false;
+
+    const bool needsSwizzle = gl->IsCoreProfile();
+    const bool hasSwizzle = gl->IsSupported(gl::GLFeature::texture_swizzle);
+    if (needsSwizzle && !hasSwizzle)
+        return false;
+
+    return true;
+}
+
+IMPL_WEBGL_EXTENSION_GOOP(WebGLExtensionTextureFloat, OES_texture_float)
+
+} // namespace mozilla