diff options
Diffstat (limited to 'vendor/gioui.org/app/internal/srgb/srgb.go')
| -rw-r--r-- | vendor/gioui.org/app/internal/srgb/srgb.go | 195 |
1 files changed, 0 insertions, 195 deletions
diff --git a/vendor/gioui.org/app/internal/srgb/srgb.go b/vendor/gioui.org/app/internal/srgb/srgb.go deleted file mode 100644 index c148b04..0000000 --- a/vendor/gioui.org/app/internal/srgb/srgb.go +++ /dev/null @@ -1,195 +0,0 @@ -// SPDX-License-Identifier: Unlicense OR MIT - -package srgb - -import ( - "fmt" - "runtime" - "strings" - - "gioui.org/app/internal/glimpl" - "gioui.org/gpu/gl" - "gioui.org/internal/unsafe" -) - -// FBO implements an intermediate sRGB FBO -// for gamma-correct rendering on platforms without -// sRGB enabled native framebuffers. -type FBO struct { - c *glimpl.Functions - width, height int - frameBuffer gl.Framebuffer - depthBuffer gl.Renderbuffer - colorTex gl.Texture - blitted bool - quad gl.Buffer - prog gl.Program - gl3 bool -} - -func New(f *glimpl.Functions) (*FBO, error) { - var gl3 bool - glVer := f.GetString(gl.VERSION) - ver, _, err := gl.ParseGLVersion(glVer) - if err != nil { - return nil, err - } - if ver[0] >= 3 { - gl3 = true - } else { - exts := f.GetString(gl.EXTENSIONS) - if !strings.Contains(exts, "EXT_sRGB") { - return nil, fmt.Errorf("no support for OpenGL ES 3 nor EXT_sRGB") - } - } - s := &FBO{ - c: f, - gl3: gl3, - frameBuffer: f.CreateFramebuffer(), - colorTex: f.CreateTexture(), - depthBuffer: f.CreateRenderbuffer(), - } - f.BindTexture(gl.TEXTURE_2D, s.colorTex) - f.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE) - f.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE) - f.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST) - f.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST) - return s, nil -} - -func (s *FBO) Blit() { - if !s.blitted { - prog, err := gl.CreateProgram(s.c, blitVSrc, blitFSrc, []string{"pos", "uv"}) - if err != nil { - panic(err) - } - s.prog = prog - s.c.UseProgram(prog) - s.c.Uniform1i(gl.GetUniformLocation(s.c, prog, "tex"), 0) - s.quad = s.c.CreateBuffer() - s.c.BindBuffer(gl.ARRAY_BUFFER, s.quad) - s.c.BufferData(gl.ARRAY_BUFFER, - unsafe.BytesView([]float32{ - -1, +1, 0, 1, - +1, +1, 1, 1, - -1, -1, 0, 0, - +1, -1, 1, 0, - }), - gl.STATIC_DRAW) - s.blitted = true - } - s.c.BindFramebuffer(gl.FRAMEBUFFER, gl.Framebuffer{}) - s.c.UseProgram(s.prog) - s.c.BindTexture(gl.TEXTURE_2D, s.colorTex) - s.c.BindBuffer(gl.ARRAY_BUFFER, s.quad) - s.c.VertexAttribPointer(0 /* pos */, 2, gl.FLOAT, false, 4*4, 0) - s.c.VertexAttribPointer(1 /* uv */, 2, gl.FLOAT, false, 4*4, 4*2) - s.c.EnableVertexAttribArray(0) - s.c.EnableVertexAttribArray(1) - s.c.DrawArrays(gl.TRIANGLE_STRIP, 0, 4) - s.c.BindTexture(gl.TEXTURE_2D, gl.Texture{}) - s.c.DisableVertexAttribArray(0) - s.c.DisableVertexAttribArray(1) - s.c.BindFramebuffer(gl.FRAMEBUFFER, s.frameBuffer) - s.c.InvalidateFramebuffer(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0) - s.c.InvalidateFramebuffer(gl.FRAMEBUFFER, gl.DEPTH_ATTACHMENT) - // The Android emulator requires framebuffer 0 bound at eglSwapBuffer time. - // Bind the sRGB framebuffer again in afterPresent. - s.c.BindFramebuffer(gl.FRAMEBUFFER, gl.Framebuffer{}) -} - -func (s *FBO) AfterPresent() { - s.c.BindFramebuffer(gl.FRAMEBUFFER, s.frameBuffer) -} - -func (s *FBO) Refresh(w, h int) error { - s.width, s.height = w, h - if w == 0 || h == 0 { - return nil - } - s.c.BindTexture(gl.TEXTURE_2D, s.colorTex) - if s.gl3 { - s.c.TexImage2D(gl.TEXTURE_2D, 0, gl.SRGB8_ALPHA8, w, h, gl.RGBA, gl.UNSIGNED_BYTE, nil) - } else /* EXT_sRGB */ { - s.c.TexImage2D(gl.TEXTURE_2D, 0, gl.SRGB_ALPHA_EXT, w, h, gl.SRGB_ALPHA_EXT, gl.UNSIGNED_BYTE, nil) - } - currentRB := gl.Renderbuffer(s.c.GetBinding(gl.RENDERBUFFER_BINDING)) - s.c.BindRenderbuffer(gl.RENDERBUFFER, s.depthBuffer) - s.c.RenderbufferStorage(gl.RENDERBUFFER, gl.DEPTH_COMPONENT16, w, h) - s.c.BindRenderbuffer(gl.RENDERBUFFER, currentRB) - s.c.BindFramebuffer(gl.FRAMEBUFFER, s.frameBuffer) - s.c.FramebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, s.colorTex, 0) - s.c.FramebufferRenderbuffer(gl.FRAMEBUFFER, gl.DEPTH_ATTACHMENT, gl.RENDERBUFFER, s.depthBuffer) - if st := s.c.CheckFramebufferStatus(gl.FRAMEBUFFER); st != gl.FRAMEBUFFER_COMPLETE { - return fmt.Errorf("sRGB framebuffer incomplete (%dx%d), status: %#x error: %x", s.width, s.height, st, s.c.GetError()) - } - - if runtime.GOOS == "js" { - // With macOS Safari, rendering to and then reading from a SRGB8_ALPHA8 - // texture result in twice gamma corrected colors. Using a plain RGBA - // texture seems to work. - s.c.ClearColor(.5, .5, .5, 1.0) - s.c.Clear(gl.COLOR_BUFFER_BIT) - var pixel [4]byte - s.c.ReadPixels(0, 0, 1, 1, gl.RGBA, gl.UNSIGNED_BYTE, pixel[:]) - if pixel[0] == 128 { // Correct sRGB color value is ~188 - s.c.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, w, h, gl.RGBA, gl.UNSIGNED_BYTE, nil) - if st := s.c.CheckFramebufferStatus(gl.FRAMEBUFFER); st != gl.FRAMEBUFFER_COMPLETE { - return fmt.Errorf("fallback RGBA framebuffer incomplete (%dx%d), status: %#x error: %x", s.width, s.height, st, s.c.GetError()) - } - } - } - - return nil -} - -func (s *FBO) Release() { - s.c.DeleteFramebuffer(s.frameBuffer) - s.c.DeleteTexture(s.colorTex) - s.c.DeleteRenderbuffer(s.depthBuffer) - if s.blitted { - s.c.DeleteBuffer(s.quad) - s.c.DeleteProgram(s.prog) - } - s.c = nil -} - -const ( - blitVSrc = ` -#version 100 - -precision highp float; - -attribute vec2 pos; -attribute vec2 uv; - -varying vec2 vUV; - -void main() { - gl_Position = vec4(pos, 0, 1); - vUV = uv; -} -` - blitFSrc = ` -#version 100 - -precision mediump float; - -uniform sampler2D tex; -varying vec2 vUV; - -vec3 gamma(vec3 rgb) { - vec3 exp = vec3(1.055)*pow(rgb, vec3(0.41666)) - vec3(0.055); - vec3 lin = rgb * vec3(12.92); - bvec3 cut = lessThan(rgb, vec3(0.0031308)); - return vec3(cut.r ? lin.r : exp.r, cut.g ? lin.g : exp.g, cut.b ? lin.b : exp.b); -} - -void main() { - vec4 col = texture2D(tex, vUV); - vec3 rgb = col.rgb; - rgb = gamma(rgb); - gl_FragColor = vec4(rgb, col.a); -} -` -) |