1 | // LAF OS Library |
2 | // Copyright (C) 2022 Igara Studio S.A. |
3 | // |
4 | // This file is released under the terms of the MIT license. |
5 | // Read LICENSE.txt for more information. |
6 | |
7 | #ifdef HAVE_CONFIG_H |
8 | #include "config.h" |
9 | #endif |
10 | |
11 | #include "base/log.h" |
12 | #include "os/skia/skia_gl.h" |
13 | |
14 | #if SK_SUPPORT_GPU |
15 | |
16 | #include "include/core/SkSurface.h" |
17 | #include "include/core/SkSurfaceCharacterization.h" |
18 | #include "src/gpu/gl/GrGLDefines.h" |
19 | |
20 | namespace os { |
21 | |
22 | SkiaGL::SkiaGL() |
23 | { |
24 | } |
25 | |
26 | bool SkiaGL::attachGL() |
27 | { |
28 | if (m_grCtx) |
29 | return true; |
30 | |
31 | try { |
32 | m_glInterfaces = GrGLMakeNativeInterface(); |
33 | if (!m_glInterfaces) { |
34 | LOG(ERROR, "OS: Cannot get native GL interface\n" ); |
35 | detachGL(); |
36 | return false; |
37 | } |
38 | |
39 | m_grCtx = GrDirectContext::MakeGL(m_glInterfaces); |
40 | if (!m_grCtx) { |
41 | LOG(ERROR, "OS: Cannot create GrContext\n" ); |
42 | detachGL(); |
43 | return false; |
44 | } |
45 | |
46 | LOG("OS: Using OpenGL backend\n" ); |
47 | } |
48 | catch (const std::exception& ex) { |
49 | LOG(ERROR, "OS: Cannot create GL context: %s\n" , ex.what()); |
50 | detachGL(); |
51 | return false; |
52 | } |
53 | return true; |
54 | } |
55 | |
56 | void SkiaGL::detachGL() |
57 | { |
58 | if (m_grCtx) { |
59 | m_grCtx->abandonContext(); |
60 | m_grCtx.reset(nullptr); |
61 | } |
62 | m_glInterfaces.reset(nullptr); |
63 | } |
64 | |
65 | bool SkiaGL::createRenderTarget(const gfx::Size& size, |
66 | const int scale, |
67 | sk_sp<SkColorSpace> colorSpace) |
68 | { |
69 | // Create of a SkSurface (m_backbufferSurface) connected to the |
70 | // OpenGL framebuffer. |
71 | |
72 | GrGLint buffer; |
73 | m_glInterfaces->fFunctions.fGetIntegerv(GR_GL_FRAMEBUFFER_BINDING, &buffer); |
74 | |
75 | GrGLFramebufferInfo info; |
76 | info.fFBOID = (GrGLuint)buffer; |
77 | info.fFormat = GR_GL_RGBA8; |
78 | |
79 | GrGLint stencil = 0; |
80 | m_glInterfaces->fFunctions.fGetIntegerv(GR_GL_STENCIL_BITS, &stencil); |
81 | |
82 | GrBackendRenderTarget target(size.w, size.h, 0, stencil, info); |
83 | |
84 | m_surface.reset(nullptr); |
85 | m_backbufferSurface = |
86 | SkSurface::MakeFromBackendRenderTarget( |
87 | m_grCtx.get(), target, |
88 | kBottomLeft_GrSurfaceOrigin, |
89 | kRGBA_8888_SkColorType, |
90 | colorSpace, |
91 | nullptr); |
92 | |
93 | if (!m_backbufferSurface) |
94 | return false; |
95 | |
96 | if (scale == 1 && m_backbufferSurface) { |
97 | m_surface = m_backbufferSurface; |
98 | } |
99 | else { |
100 | SkImageInfo info = SkImageInfo::Make( |
101 | std::max(1, size.w / scale), |
102 | std::max(1, size.h / scale), |
103 | kN32_SkColorType, |
104 | kOpaque_SkAlphaType, |
105 | colorSpace); |
106 | |
107 | SkSurfaceCharacterization ch; |
108 | m_backbufferSurface->characterize(&ch); |
109 | |
110 | m_surface = |
111 | SkSurface::MakeRenderTarget( |
112 | m_grCtx.get(), SkBudgeted::kNo, |
113 | info, ch.sampleCount(), nullptr); |
114 | } |
115 | |
116 | return true; |
117 | } |
118 | |
119 | } // namespace os |
120 | |
121 | #endif |
122 | |