mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-20 13:22:19 +02:00
302 lines
7.6 KiB
Go
302 lines
7.6 KiB
Go
// Copyright 2014 Hajime Hoshi
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// +build js
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package opengl
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import (
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"errors"
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"fmt"
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"github.com/gopherjs/gopherjs/js"
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"github.com/gopherjs/webgl"
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)
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type Texture struct {
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js.Object
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}
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type Framebuffer struct {
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js.Object
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}
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type Shader struct {
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js.Object
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}
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type Program struct {
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js.Object
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}
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type UniformLocation struct {
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js.Object
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}
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type AttribLocation int
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type ProgramID int
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func GetProgramID(p Program) ProgramID {
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return ProgramID(p.Get("__ebiten_programId").Int())
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}
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type context struct {
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gl *webgl.Context
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}
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func NewContext(gl *webgl.Context) *Context {
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c := &Context{
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Nearest: FilterType(gl.NEAREST),
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Linear: FilterType(gl.LINEAR),
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VertexShader: ShaderType(gl.VERTEX_SHADER),
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FragmentShader: ShaderType(gl.FRAGMENT_SHADER),
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ArrayBuffer: BufferType(gl.ARRAY_BUFFER),
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ElementArrayBuffer: BufferType(gl.ELEMENT_ARRAY_BUFFER),
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DynamicDraw: BufferUsageType(gl.DYNAMIC_DRAW),
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StaticDraw: BufferUsageType(gl.STATIC_DRAW),
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}
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c.gl = gl
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c.init()
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return c
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}
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func (c *Context) init() {
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gl := c.gl
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// Textures' pixel formats are alpha premultiplied.
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gl.Enable(gl.BLEND)
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gl.BlendFunc(gl.ONE, gl.ONE_MINUS_SRC_ALPHA)
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}
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func (c *Context) NewTexture(width, height int, pixels []uint8, filter FilterType) (Texture, error) {
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gl := c.gl
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t := gl.CreateTexture()
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if t == nil {
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return Texture{nil}, errors.New("glGenTexture failed")
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}
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gl.PixelStorei(gl.UNPACK_ALIGNMENT, 4)
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gl.BindTexture(gl.TEXTURE_2D, t)
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gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, int(filter))
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gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, int(filter))
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// void texImage2D(GLenum target, GLint level, GLenum internalformat,
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// GLsizei width, GLsizei height, GLint border, GLenum format,
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// GLenum type, ArrayBufferView? pixels);
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var p interface{}
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if pixels != nil {
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p = pixels
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}
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gl.Call("texImage2D", gl.TEXTURE_2D, 0, gl.RGBA, width, height, 0, gl.RGBA, gl.UNSIGNED_BYTE, p)
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return Texture{t}, nil
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}
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func (c *Context) TexturePixels(t Texture, width, height int) ([]uint8, error) {
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gl := c.gl
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gl.Flush()
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// TODO: Use glGetTexLevelParameteri and GL_TEXTURE_WIDTH?
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pixels := js.Global.Get("Uint8Array").New(4 * width * height)
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gl.BindTexture(gl.TEXTURE_2D, t.Object)
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gl.ReadPixels(0, 0, width, height, gl.RGBA, gl.UNSIGNED_BYTE, pixels)
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if e := gl.GetError(); e != gl.NO_ERROR {
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return nil, errors.New(fmt.Sprintf("gl error: %d", e))
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}
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return pixels.Interface().([]uint8), nil
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}
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func (c *Context) BindTexture(t Texture) {
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gl := c.gl
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gl.BindTexture(gl.TEXTURE_2D, t.Object)
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}
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func (c *Context) DeleteTexture(t Texture) {
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gl := c.gl
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gl.DeleteTexture(t.Object)
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}
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func (c *Context) GlslHighpSupported() bool {
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gl := c.gl
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// headless-gl library may not define getShaderPrecisionFormat.
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if gl.Get("getShaderPrecisionFormat") == js.Undefined {
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return false
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}
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return gl.Call("getShaderPrecisionFormat", gl.FRAGMENT_SHADER, gl.HIGH_FLOAT).Get("precision").Int() != 0
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}
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func (c *Context) NewFramebuffer(t Texture) (Framebuffer, error) {
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gl := c.gl
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f := gl.CreateFramebuffer()
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gl.BindFramebuffer(gl.FRAMEBUFFER, f)
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gl.FramebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, t.Object, 0)
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if gl.CheckFramebufferStatus(gl.FRAMEBUFFER) != gl.FRAMEBUFFER_COMPLETE {
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return Framebuffer{nil}, errors.New("creating framebuffer failed")
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}
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return Framebuffer{f}, nil
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}
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var lastFramebuffer Framebuffer
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func (c *Context) SetViewport(f Framebuffer, width, height int) error {
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gl := c.gl
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if lastFramebuffer != f {
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gl.Flush()
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lastFramebuffer = f
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}
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if f.Object != nil {
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gl.BindFramebuffer(gl.FRAMEBUFFER, f.Object)
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} else {
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gl.BindFramebuffer(gl.FRAMEBUFFER, nil)
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}
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// gl.CheckFramebufferStatus might cause a performance problem. Don't call this here.
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gl.Viewport(0, 0, width, height)
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return nil
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}
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func (c *Context) FillFramebuffer(r, g, b, a float64) error {
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// TODO: Use f?
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gl := c.gl
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gl.ClearColor(float32(r), float32(g), float32(b), float32(a))
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gl.Clear(gl.COLOR_BUFFER_BIT)
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return nil
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}
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func (c *Context) DeleteFramebuffer(f Framebuffer) {
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gl := c.gl
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gl.DeleteFramebuffer(f.Object)
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}
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func (c *Context) NewShader(shaderType ShaderType, source string) (Shader, error) {
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gl := c.gl
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s := gl.CreateShader(int(shaderType))
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if s == nil {
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println(gl.GetError())
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return Shader{nil}, errors.New("glCreateShader failed")
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}
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gl.ShaderSource(s, source)
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gl.CompileShader(s)
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if !gl.GetShaderParameterb(s, gl.COMPILE_STATUS) {
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log := gl.GetShaderInfoLog(s)
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return Shader{nil}, errors.New(fmt.Sprintf("shader compile failed: %s", log))
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}
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return Shader{s}, nil
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}
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func (c *Context) DeleteShader(s Shader) {
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gl := c.gl
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gl.DeleteShader(s.Object)
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}
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var lastProgramID ProgramID = 0
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func (c *Context) NewProgram(shaders []Shader) (Program, error) {
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gl := c.gl
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p := gl.CreateProgram()
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if p == nil {
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return Program{nil}, errors.New("glCreateProgram failed")
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}
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p.Set("__ebiten_programId", lastProgramID)
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lastProgramID++
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for _, shader := range shaders {
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gl.AttachShader(p, shader.Object)
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}
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gl.LinkProgram(p)
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if !gl.GetProgramParameterb(p, gl.LINK_STATUS) {
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return Program{nil}, errors.New("program error")
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}
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return Program{p}, nil
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}
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func (c *Context) UseProgram(p Program) {
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gl := c.gl
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gl.UseProgram(p.Object)
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}
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func (c *Context) GetUniformLocation(p Program, location string) UniformLocation {
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gl := c.gl
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return UniformLocation{gl.GetUniformLocation(p.Object, location)}
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}
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func (c *Context) UniformInt(p Program, location string, v int) {
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gl := c.gl
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l := GetUniformLocation(c, p, location)
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gl.Uniform1i(l.Object, v)
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}
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func (c *Context) UniformFloats(p Program, location string, v []float32) {
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gl := c.gl
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l := GetUniformLocation(c, p, location)
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switch len(v) {
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case 4:
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gl.Call("uniform4fv", l.Object, v)
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case 16:
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gl.UniformMatrix4fv(l.Object, false, v)
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default:
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panic("not reach")
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}
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}
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func (c *Context) GetAttribLocation(p Program, location string) AttribLocation {
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gl := c.gl
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return AttribLocation(gl.GetAttribLocation(p.Object, location))
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}
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func (c *Context) VertexAttribPointer(p Program, location string, signed bool, normalize bool, stride int, size int, v uintptr) {
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gl := c.gl
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l := GetAttribLocation(c, p, location)
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t := gl.SHORT
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if !signed {
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t = gl.UNSIGNED_SHORT
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}
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gl.VertexAttribPointer(int(l), size, t, normalize, stride, int(v))
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}
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func (c *Context) EnableVertexAttribArray(p Program, location string) {
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gl := c.gl
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l := GetAttribLocation(c, p, location)
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gl.EnableVertexAttribArray(int(l))
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}
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func (c *Context) DisableVertexAttribArray(p Program, location string) {
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gl := c.gl
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l := GetAttribLocation(c, p, location)
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gl.DisableVertexAttribArray(int(l))
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}
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func (c *Context) NewBuffer(bufferType BufferType, v interface{}, bufferUsageType BufferUsageType) {
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gl := c.gl
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b := gl.CreateBuffer()
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gl.BindBuffer(int(bufferType), b)
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gl.BufferData(int(bufferType), v, int(bufferUsageType))
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}
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func (c *Context) BufferSubData(bufferType BufferType, data []int16) {
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gl := c.gl
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gl.BufferSubData(int(bufferType), 0, data)
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}
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func (c *Context) DrawElements(len int) {
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gl := c.gl
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gl.DrawElements(gl.TRIANGLES, len, gl.UNSIGNED_SHORT, 0)
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}
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func (c *Context) Flush() {
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gl := c.gl
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gl.Flush()
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}
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