ebiten/internal/opengl/context_js.go

323 lines
8.1 KiB
Go
Raw Normal View History

2014-12-31 13:55:40 +01:00
// Copyright 2014 Hajime Hoshi
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// +build js
package opengl
import (
"errors"
"fmt"
"github.com/gopherjs/gopherjs/js"
"github.com/gopherjs/webgl"
)
type Texture struct {
js.Object
}
type Framebuffer struct {
js.Object
}
type Shader struct {
js.Object
}
type Program struct {
js.Object
}
2015-01-17 04:45:19 +01:00
type Buffer struct {
js.Object
}
// TODO: Remove this after the GopherJS bug was fixed (#159)
func (p Program) Equals(other Program) bool {
return p.Object == other.Object
}
type UniformLocation struct {
js.Object
}
2015-01-03 07:56:54 +01:00
type AttribLocation int
2014-12-31 13:55:40 +01:00
2015-01-12 15:16:34 +01:00
type ProgramID int
func GetProgramID(p Program) ProgramID {
return ProgramID(p.Get("__ebiten_programId").Int())
}
2014-12-31 13:55:40 +01:00
type context struct {
gl *webgl.Context
}
var lastFramebuffer Framebuffer
2014-12-31 13:55:40 +01:00
func NewContext(gl *webgl.Context) *Context {
c := &Context{
2015-01-17 04:45:19 +01:00
Nearest: Filter(gl.NEAREST),
Linear: Filter(gl.LINEAR),
2014-12-31 13:55:40 +01:00
VertexShader: ShaderType(gl.VERTEX_SHADER),
FragmentShader: ShaderType(gl.FRAGMENT_SHADER),
ArrayBuffer: BufferType(gl.ARRAY_BUFFER),
ElementArrayBuffer: BufferType(gl.ELEMENT_ARRAY_BUFFER),
2015-01-17 04:45:19 +01:00
DynamicDraw: BufferUsage(gl.DYNAMIC_DRAW),
StaticDraw: BufferUsage(gl.STATIC_DRAW),
Triangles: Mode(gl.TRIANGLES),
Lines: Mode(gl.LINES),
2014-12-31 13:55:40 +01:00
}
2015-01-02 07:20:05 +01:00
c.gl = gl
2014-12-31 13:55:40 +01:00
c.init()
return c
}
func (c *Context) init() {
gl := c.gl
// Textures' pixel formats are alpha premultiplied.
gl.Enable(gl.BLEND)
gl.BlendFunc(gl.ONE, gl.ONE_MINUS_SRC_ALPHA)
}
2015-01-17 04:45:19 +01:00
func (c *Context) NewTexture(width, height int, pixels []uint8, filter Filter) (Texture, error) {
2014-12-31 13:55:40 +01:00
gl := c.gl
t := gl.CreateTexture()
2015-01-04 14:25:58 +01:00
if t == nil {
return Texture{nil}, errors.New("glGenTexture failed")
2014-12-31 13:55:40 +01:00
}
gl.PixelStorei(gl.UNPACK_ALIGNMENT, 4)
gl.BindTexture(gl.TEXTURE_2D, t)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, int(filter))
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, int(filter))
// void texImage2D(GLenum target, GLint level, GLenum internalformat,
// GLsizei width, GLsizei height, GLint border, GLenum format,
// GLenum type, ArrayBufferView? pixels);
2015-01-02 15:30:22 +01:00
var p interface{}
if pixels != nil {
p = pixels
}
gl.Call("texImage2D", gl.TEXTURE_2D, 0, gl.RGBA, width, height, 0, gl.RGBA, gl.UNSIGNED_BYTE, p)
2014-12-31 13:55:40 +01:00
return Texture{t}, nil
2014-12-31 13:55:40 +01:00
}
func (c *Context) FramebufferPixels(f Framebuffer, width, height int) ([]uint8, error) {
2014-12-31 13:55:40 +01:00
gl := c.gl
2015-01-02 17:14:36 +01:00
gl.Flush()
lastFramebuffer = Framebuffer{nil}
gl.BindFramebuffer(gl.FRAMEBUFFER, f.Object)
2014-12-31 13:55:40 +01:00
pixels := js.Global.Get("Uint8Array").New(4 * width * height)
gl.ReadPixels(0, 0, width, height, gl.RGBA, gl.UNSIGNED_BYTE, pixels)
if e := gl.GetError(); e != gl.NO_ERROR {
return nil, errors.New(fmt.Sprintf("gl error: %d", e))
}
return pixels.Interface().([]uint8), nil
}
func (c *Context) BindTexture(t Texture) {
gl := c.gl
gl.BindTexture(gl.TEXTURE_2D, t.Object)
2014-12-31 13:55:40 +01:00
}
func (c *Context) DeleteTexture(t Texture) {
gl := c.gl
gl.DeleteTexture(t.Object)
2014-12-31 13:55:40 +01:00
}
2015-01-02 15:30:22 +01:00
func (c *Context) GlslHighpSupported() bool {
gl := c.gl
2015-01-14 15:38:25 +01:00
// headless-gl library may not define getShaderPrecisionFormat.
2015-01-13 16:18:36 +01:00
if gl.Get("getShaderPrecisionFormat") == js.Undefined {
return false
}
2015-01-02 15:30:22 +01:00
return gl.Call("getShaderPrecisionFormat", gl.FRAGMENT_SHADER, gl.HIGH_FLOAT).Get("precision").Int() != 0
}
func (c *Context) NewFramebuffer(t Texture) (Framebuffer, error) {
2014-12-31 13:55:40 +01:00
gl := c.gl
f := gl.CreateFramebuffer()
lastFramebuffer = Framebuffer{nil}
2014-12-31 13:55:40 +01:00
gl.BindFramebuffer(gl.FRAMEBUFFER, f)
gl.FramebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, t.Object, 0)
2014-12-31 13:55:40 +01:00
if gl.CheckFramebufferStatus(gl.FRAMEBUFFER) != gl.FRAMEBUFFER_COMPLETE {
return Framebuffer{nil}, errors.New("creating framebuffer failed")
2014-12-31 13:55:40 +01:00
}
return Framebuffer{f}, nil
2014-12-31 13:55:40 +01:00
}
func (c *Context) SetViewport(f Framebuffer, width, height int) error {
gl := c.gl
// TODO: Fix this after the GopherJS bug was fixed (#159)
if lastFramebuffer.Object != f.Object {
2015-01-03 08:21:09 +01:00
gl.Flush()
lastFramebuffer = f
}
if f.Object != nil {
gl.BindFramebuffer(gl.FRAMEBUFFER, f.Object)
} else {
2015-01-04 14:25:58 +01:00
gl.BindFramebuffer(gl.FRAMEBUFFER, nil)
}
// gl.CheckFramebufferStatus might cause a performance problem. Don't call this here.
2014-12-31 13:55:40 +01:00
gl.Viewport(0, 0, width, height)
return nil
}
func (c *Context) FillFramebuffer(r, g, b, a float64) error {
// TODO: Use f?
2014-12-31 13:55:40 +01:00
gl := c.gl
gl.ClearColor(float32(r), float32(g), float32(b), float32(a))
gl.Clear(gl.COLOR_BUFFER_BIT)
return nil
}
func (c *Context) DeleteFramebuffer(f Framebuffer) {
gl := c.gl
gl.DeleteFramebuffer(f.Object)
2014-12-31 13:55:40 +01:00
}
func (c *Context) NewShader(shaderType ShaderType, source string) (Shader, error) {
gl := c.gl
s := gl.CreateShader(int(shaderType))
2015-01-04 14:25:58 +01:00
if s == nil {
2014-12-31 13:55:40 +01:00
println(gl.GetError())
return Shader{nil}, errors.New("glCreateShader failed")
2014-12-31 13:55:40 +01:00
}
gl.ShaderSource(s, source)
gl.CompileShader(s)
if !gl.GetShaderParameterb(s, gl.COMPILE_STATUS) {
log := gl.GetShaderInfoLog(s)
return Shader{nil}, errors.New(fmt.Sprintf("shader compile failed: %s", log))
2014-12-31 13:55:40 +01:00
}
return Shader{s}, nil
2014-12-31 13:55:40 +01:00
}
func (c *Context) DeleteShader(s Shader) {
gl := c.gl
gl.DeleteShader(s.Object)
2014-12-31 13:55:40 +01:00
}
2015-01-12 15:16:34 +01:00
var lastProgramID ProgramID = 0
2014-12-31 13:55:40 +01:00
func (c *Context) NewProgram(shaders []Shader) (Program, error) {
gl := c.gl
p := gl.CreateProgram()
2015-01-04 14:25:58 +01:00
if p == nil {
return Program{nil}, errors.New("glCreateProgram failed")
2014-12-31 13:55:40 +01:00
}
2015-01-12 15:16:34 +01:00
p.Set("__ebiten_programId", lastProgramID)
lastProgramID++
2014-12-31 13:55:40 +01:00
for _, shader := range shaders {
gl.AttachShader(p, shader.Object)
2014-12-31 13:55:40 +01:00
}
gl.LinkProgram(p)
if !gl.GetProgramParameterb(p, gl.LINK_STATUS) {
return Program{nil}, errors.New("program error")
2014-12-31 13:55:40 +01:00
}
return Program{p}, nil
2014-12-31 13:55:40 +01:00
}
func (c *Context) UseProgram(p Program) {
gl := c.gl
gl.UseProgram(p.Object)
2014-12-31 13:55:40 +01:00
}
2015-01-12 15:16:34 +01:00
func (c *Context) GetUniformLocation(p Program, location string) UniformLocation {
gl := c.gl
return UniformLocation{gl.GetUniformLocation(p.Object, location)}
2015-01-12 15:16:34 +01:00
}
2015-01-03 07:52:02 +01:00
func (c *Context) UniformInt(p Program, location string, v int) {
2014-12-31 13:55:40 +01:00
gl := c.gl
2015-01-12 15:16:34 +01:00
l := GetUniformLocation(c, p, location)
gl.Uniform1i(l.Object, v)
2015-01-03 07:52:02 +01:00
}
func (c *Context) UniformFloats(p Program, location string, v []float32) {
gl := c.gl
2015-01-12 15:16:34 +01:00
l := GetUniformLocation(c, p, location)
2015-01-03 07:52:02 +01:00
switch len(v) {
case 4:
gl.Call("uniform4fv", l.Object, v)
2015-01-03 07:52:02 +01:00
case 16:
gl.UniformMatrix4fv(l.Object, false, v)
default:
panic("not reach")
2014-12-31 13:55:40 +01:00
}
}
2015-01-12 15:16:34 +01:00
func (c *Context) GetAttribLocation(p Program, location string) AttribLocation {
gl := c.gl
return AttribLocation(gl.GetAttribLocation(p.Object, location))
2015-01-12 15:16:34 +01:00
}
2015-01-16 02:37:26 +01:00
func (c *Context) VertexAttribPointer(p Program, location string, signed bool, normalize bool, stride int, size int, v uintptr) {
2014-12-31 13:55:40 +01:00
gl := c.gl
2015-01-12 15:16:34 +01:00
l := GetAttribLocation(c, p, location)
2015-01-16 02:37:26 +01:00
t := gl.SHORT
if !signed {
t = gl.UNSIGNED_SHORT
}
gl.VertexAttribPointer(int(l), size, t, normalize, stride, int(v))
2014-12-31 13:55:40 +01:00
}
func (c *Context) EnableVertexAttribArray(p Program, location string) {
gl := c.gl
2015-01-12 15:16:34 +01:00
l := GetAttribLocation(c, p, location)
2015-01-03 07:56:54 +01:00
gl.EnableVertexAttribArray(int(l))
2014-12-31 13:55:40 +01:00
}
func (c *Context) DisableVertexAttribArray(p Program, location string) {
gl := c.gl
2015-01-12 15:16:34 +01:00
l := GetAttribLocation(c, p, location)
2015-01-03 07:56:54 +01:00
gl.DisableVertexAttribArray(int(l))
2014-12-31 13:55:40 +01:00
}
2015-01-17 04:45:19 +01:00
func (c *Context) NewBuffer(bufferType BufferType, v interface{}, bufferUsage BufferUsage) Buffer {
2014-12-31 13:55:40 +01:00
gl := c.gl
b := gl.CreateBuffer()
gl.BindBuffer(int(bufferType), b)
2015-01-17 04:45:19 +01:00
gl.BufferData(int(bufferType), v, int(bufferUsage))
return Buffer{b}
}
func (c *Context) BindElementArrayBuffer(b Buffer) {
gl := c.gl
gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, b.Object)
2014-12-31 13:55:40 +01:00
}
2015-01-16 02:37:26 +01:00
func (c *Context) BufferSubData(bufferType BufferType, data []int16) {
2014-12-31 13:55:40 +01:00
gl := c.gl
gl.BufferSubData(int(bufferType), 0, data)
}
2015-01-17 04:45:19 +01:00
func (c *Context) DrawElements(mode Mode, len int) {
2014-12-31 13:55:40 +01:00
gl := c.gl
2015-01-17 04:45:19 +01:00
gl.DrawElements(int(mode), len, gl.UNSIGNED_SHORT, 0)
2014-12-31 13:55:40 +01:00
}
func (c *Context) Flush() {
gl := c.gl
gl.Flush()
}