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// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package gldriver
import (
"encoding/binary"
"image"
"image/color"
"image/draw"
"golang.org/x/exp/shiny/screen"
"golang.org/x/mobile/gl"
)
type textureImpl struct {
w *windowImpl
id gl.Texture
fb gl.Framebuffer
size image.Point
}
func (t *textureImpl) Size() image.Point { return t.size }
func (t *textureImpl) Bounds() image.Rectangle { return image.Rectangle{Max: t.size} }
func (t *textureImpl) Release() {
t.w.glctxMu.Lock()
defer t.w.glctxMu.Unlock()
if t.fb.Value != 0 {
t.w.glctx.DeleteFramebuffer(t.fb)
t.fb = gl.Framebuffer{}
}
t.w.glctx.DeleteTexture(t.id)
t.id = gl.Texture{}
}
func (t *textureImpl) Upload(dp image.Point, src screen.Buffer, sr image.Rectangle) {
buf := src.(*bufferImpl)
buf.preUpload()
// src2dst is added to convert from the src coordinate space to the dst
// coordinate space. It is subtracted to convert the other way.
src2dst := dp.Sub(sr.Min)
// Clip to the source.
sr = sr.Intersect(buf.Bounds())
// Clip to the destination.
dr := sr.Add(src2dst)
dr = dr.Intersect(t.Bounds())
if dr.Empty() {
return
}
// Bring dr.Min in dst-space back to src-space to get the pixel buffer offset.
pix := buf.rgba.Pix[buf.rgba.PixOffset(dr.Min.X-src2dst.X, dr.Min.Y-src2dst.Y):]
t.w.glctxMu.Lock()
defer t.w.glctxMu.Unlock()
t.w.glctx.BindTexture(gl.TEXTURE_2D, t.id)
width := dr.Dx()
if width*4 == buf.rgba.Stride {
t.w.glctx.TexSubImage2D(gl.TEXTURE_2D, 0, dr.Min.X, dr.Min.Y, width, dr.Dy(), gl.RGBA, gl.UNSIGNED_BYTE, pix)
return
}
// TODO: can we use GL_UNPACK_ROW_LENGTH with glPixelStorei for stride in
// ES 3.0, instead of uploading the pixels row-by-row?
for y, p := dr.Min.Y, 0; y < dr.Max.Y; y++ {
t.w.glctx.TexSubImage2D(gl.TEXTURE_2D, 0, dr.Min.X, y, width, 1, gl.RGBA, gl.UNSIGNED_BYTE, pix[p:])
p += buf.rgba.Stride
}
}
func (t *textureImpl) Fill(dr image.Rectangle, src color.Color, op draw.Op) {
minX := float64(dr.Min.X)
minY := float64(dr.Min.Y)
maxX := float64(dr.Max.X)
maxY := float64(dr.Max.Y)
mvp := calcMVP(
t.size.X, t.size.Y,
minX, minY,
maxX, minY,
minX, maxY,
)
glctx := t.w.glctx
t.w.glctxMu.Lock()
defer t.w.glctxMu.Unlock()
create := t.fb.Value == 0
if create {
t.fb = glctx.CreateFramebuffer()
}
glctx.BindFramebuffer(gl.FRAMEBUFFER, t.fb)
if create {
glctx.FramebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, t.id, 0)
}
glctx.Viewport(0, 0, t.size.X, t.size.Y)
doFill(t.w.s, t.w.glctx, mvp, src, op)
// We can't restore the GL state (i.e. bind the back buffer, also known as
// gl.Framebuffer{Value: 0}) right away, since we don't necessarily know
// the right viewport size yet. It is valid to call textureImpl.Fill before
// we've gotten our first size.Event. We bind it lazily instead.
t.w.backBufferBound = false
}
var quadCoords = f32Bytes(binary.LittleEndian,
0, 0, // top left
1, 0, // top right
0, 1, // bottom left
1, 1, // bottom right
)
const textureVertexSrc = `#version 100
uniform mat3 mvp;
uniform mat3 uvp;
attribute vec3 pos;
attribute vec2 inUV;
varying vec2 uv;
void main() {
vec3 p = pos;
p.z = 1.0;
gl_Position = vec4(mvp * p, 1);
uv = (uvp * vec3(inUV, 1)).xy;
}
`
const textureFragmentSrc = `#version 100
precision mediump float;
varying vec2 uv;
uniform sampler2D sample;
void main() {
gl_FragColor = texture2D(sample, uv);
}
`
const fillVertexSrc = `#version 100
uniform mat3 mvp;
attribute vec3 pos;
void main() {
vec3 p = pos;
p.z = 1.0;
gl_Position = vec4(mvp * p, 1);
}
`
const fillFragmentSrc = `#version 100
precision mediump float;
uniform vec4 color;
void main() {
gl_FragColor = color;
}
`
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