e6778f330d
Adds a simple system for the user to supply flags via the location hash. e.g., "http://.../viewer.html#msaa:8" Implements the msaa flag by rendering to a multisampled offscreen framebuffer, then blitting it to the main canvas framebuffer. Change-Id: I7f2b8b769e491f2169fd6b967a72a8ea9c8ffb8b Reviewed-on: https://skia-review.googlesource.com/c/skia/+/292199 Reviewed-by: Kevin Lubick <kjlubick@google.com> Commit-Queue: Chris Dalton <csmartdalton@google.com>
104 lines
4.1 KiB
C++
104 lines
4.1 KiB
C++
/*
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* Copyright 2020 Google LLC
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include <emscripten.h>
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#include <emscripten/bind.h>
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#include "include/core/SkCanvas.h"
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#include "include/core/SkSurface.h"
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#include "include/gpu/GrContext.h"
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#include "tools/viewer/SampleSlide.h"
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#include <GLES3/gl3.h>
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#include <string>
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using namespace emscripten;
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sk_sp<Slide> MakeSlide(std::string name) {
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if (name == "WavyPathText") {
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extern Sample* MakeWavyPathTextSample();
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return sk_make_sp<SampleSlide>(MakeWavyPathTextSample);
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}
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return nullptr;
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}
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static void delete_wrapped_framebuffer(SkSurface::ReleaseContext context) {
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GLuint framebuffer = (GLuint)context;
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glDeleteFramebuffers(1, &framebuffer);
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}
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sk_sp<SkSurface> MakeOffscreenFramebuffer(sk_sp<GrContext> grContext, int width, int height,
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int sampleCnt) {
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GLuint colorBuffer;
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glGenRenderbuffers(1, &colorBuffer);
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glBindRenderbuffer(GL_RENDERBUFFER, colorBuffer);
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glRenderbufferStorageMultisample(GL_RENDERBUFFER, sampleCnt, GL_RGBA8, width, height);
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GLuint stencilBuffer;
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glGenRenderbuffers(1, &stencilBuffer);
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glBindRenderbuffer(GL_RENDERBUFFER, stencilBuffer);
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glRenderbufferStorageMultisample(GL_RENDERBUFFER, sampleCnt, GL_STENCIL_INDEX8, width, height);
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GLuint framebuffer;
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glGenFramebuffers(1, &framebuffer);
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glBindFramebuffer(GL_FRAMEBUFFER, framebuffer);
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glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER,
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colorBuffer);
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glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_RENDERBUFFER,
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stencilBuffer);
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// Unbind "framebuffer" before orphaning its renderbuffers. (Otherwise they are spec'd to be
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// detached from the currently bound framebuffer.)
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glBindFramebuffer(GL_FRAMEBUFFER, 0);
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glDeleteRenderbuffers(1, &colorBuffer);
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glDeleteRenderbuffers(1, &stencilBuffer);
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grContext->resetContext(kRenderTarget_GrGLBackendState);
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GrGLFramebufferInfo glInfo;
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glInfo.fFBOID = framebuffer;
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glInfo.fFormat = GL_RGBA8;
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GrBackendRenderTarget backendRenderTarget(width, height, sampleCnt, 8, glInfo);
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return SkSurface::MakeFromBackendRenderTarget(grContext.get(), backendRenderTarget,
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kBottomLeft_GrSurfaceOrigin,
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SkColorType::kRGBA_8888_SkColorType, nullptr,
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nullptr, &delete_wrapped_framebuffer,
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(SkSurface::ReleaseContext)framebuffer);
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}
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enum class GLFilter {
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kNearest = GL_NEAREST,
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kLinear = GL_LINEAR
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};
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void BlitOffscreenFramebuffer(sk_sp<SkSurface> surface, int srcX0, int srcY0, int srcX1, int srcY1,
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int dstX0, int dstY0, int dstX1, int dstY1, GLFilter filter) {
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surface->flush(SkSurface::BackendSurfaceAccess::kPresent, GrFlushInfo());
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GrGLFramebufferInfo glInfo;
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auto backendRT = surface->getBackendRenderTarget(SkSurface::kFlushRead_BackendHandleAccess);
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backendRT.getGLFramebufferInfo(&glInfo);
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glBindFramebuffer(GL_READ_FRAMEBUFFER, glInfo.fFBOID);
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glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
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glBlitFramebuffer(srcX0, srcY0, srcX1, srcY1, dstX0, dstY0, dstX1, dstY1, GL_COLOR_BUFFER_BIT,
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(GLenum)filter);
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surface->getContext()->resetContext(kRenderTarget_GrGLBackendState);
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}
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EMSCRIPTEN_BINDINGS(Viewer) {
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function("MakeSlide", &MakeSlide);
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function("MakeOffscreenFramebuffer", &MakeOffscreenFramebuffer);
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function("BlitOffscreenFramebuffer", &BlitOffscreenFramebuffer);
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class_<Slide>("Slide")
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.smart_ptr<sk_sp<Slide>>("sk_sp<Slide>")
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.function("load", &Slide::load)
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.function("animate", &Slide::animate)
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.function("draw", optional_override([](Slide& self, SkCanvas& canvas) {
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self.draw(&canvas);
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}));
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enum_<GLFilter>("GLFilter")
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.value("Nearest", GLFilter::kNearest)
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.value("Linear", GLFilter::kLinear);
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}
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