mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-10 13:07:26 +01:00
406 lines
10 KiB
Go
406 lines
10 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 android ios
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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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"reflect"
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"unsafe"
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mgl "golang.org/x/mobile/gl"
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)
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type (
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Texture mgl.Texture
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Framebuffer mgl.Framebuffer
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Shader mgl.Shader
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Program mgl.Program
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Buffer mgl.Buffer
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)
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var InvalidTexture Texture
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type (
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uniformLocation mgl.Uniform
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attribLocation mgl.Attrib
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)
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type programID uint32
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var (
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invalidTexture = Texture(mgl.Texture{})
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invalidFramebuffer = Framebuffer(mgl.Framebuffer{(1 << 32) - 1})
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)
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func getProgramID(p Program) programID {
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return programID(p.Value)
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}
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func init() {
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VertexShader = mgl.VERTEX_SHADER
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FragmentShader = mgl.FRAGMENT_SHADER
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ArrayBuffer = mgl.ARRAY_BUFFER
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ElementArrayBuffer = mgl.ELEMENT_ARRAY_BUFFER
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DynamicDraw = mgl.DYNAMIC_DRAW
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StaticDraw = mgl.STATIC_DRAW
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Triangles = mgl.TRIANGLES
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Lines = mgl.LINES
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Short = mgl.SHORT
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Float = mgl.FLOAT
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zero = mgl.ZERO
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one = mgl.ONE
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srcAlpha = mgl.SRC_ALPHA
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dstAlpha = mgl.DST_ALPHA
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oneMinusSrcAlpha = mgl.ONE_MINUS_SRC_ALPHA
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oneMinusDstAlpha = mgl.ONE_MINUS_DST_ALPHA
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}
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type context struct {
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gl mgl.Context
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worker mgl.Worker
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}
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func Init() {
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c := &Context{}
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c.gl, c.worker = mgl.NewContext()
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theContext = c
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}
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func (c *Context) DoWork(chError <-chan error, chDone <-chan struct{}) error {
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// TODO: Check this is called on the rendering thread
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loop:
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for {
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select {
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case err := <-chError:
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return err
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case <-c.worker.WorkAvailable():
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c.worker.DoWork()
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case <-chDone:
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break loop
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}
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}
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return nil
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}
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func (c *Context) Reset() error {
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c.locationCache = newLocationCache()
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c.lastTexture = invalidTexture
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c.lastFramebuffer = invalidFramebuffer
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c.lastViewportWidth = 0
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c.lastViewportHeight = 0
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c.lastCompositeMode = CompositeModeUnknown
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c.gl.Enable(mgl.BLEND)
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c.BlendFunc(CompositeModeSourceOver)
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f := c.gl.GetInteger(mgl.FRAMEBUFFER_BINDING)
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c.screenFramebuffer = Framebuffer(mgl.Framebuffer{uint32(f)})
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// TODO: Need to update screenFramebufferWidth/Height?
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return nil
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}
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func (c *Context) BlendFunc(mode CompositeMode) {
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gl := c.gl
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if c.lastCompositeMode == mode {
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return
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}
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c.lastCompositeMode = mode
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s, d := operations(mode)
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gl.BlendFunc(mgl.Enum(s), mgl.Enum(d))
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}
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func (c *Context) NewTexture(width, height int) (Texture, error) {
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gl := c.gl
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t := gl.CreateTexture()
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if t.Value <= 0 {
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return Texture{}, errors.New("opengl: creating texture failed")
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}
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gl.PixelStorei(mgl.UNPACK_ALIGNMENT, 4)
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c.BindTexture(Texture(t))
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gl.TexParameteri(mgl.TEXTURE_2D, mgl.TEXTURE_MAG_FILTER, mgl.NEAREST)
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gl.TexParameteri(mgl.TEXTURE_2D, mgl.TEXTURE_MIN_FILTER, mgl.NEAREST)
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gl.TexImage2D(mgl.TEXTURE_2D, 0, width, height, mgl.RGBA, mgl.UNSIGNED_BYTE, nil)
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return Texture(t), nil
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}
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func (c *Context) bindFramebufferImpl(f Framebuffer) {
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gl := c.gl
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gl.BindFramebuffer(mgl.FRAMEBUFFER, mgl.Framebuffer(f))
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}
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func (c *Context) FramebufferPixels(f Framebuffer, width, height int) ([]byte, error) {
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gl := c.gl
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gl.Flush()
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c.bindFramebuffer(f)
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pixels := make([]byte, 4*width*height)
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gl.ReadPixels(pixels, 0, 0, width, height, mgl.RGBA, mgl.UNSIGNED_BYTE)
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if e := gl.GetError(); e != mgl.NO_ERROR {
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return nil, fmt.Errorf("opengl: glReadPixels: %d", e)
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}
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return pixels, nil
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}
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func (c *Context) bindTextureImpl(t Texture) {
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gl := c.gl
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gl.BindTexture(mgl.TEXTURE_2D, mgl.Texture(t))
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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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if !gl.IsTexture(mgl.Texture(t)) {
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return
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}
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if c.lastTexture == t {
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c.lastTexture = invalidTexture
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}
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gl.DeleteTexture(mgl.Texture(t))
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}
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func (c *Context) IsTexture(t Texture) bool {
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gl := c.gl
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return gl.IsTexture(mgl.Texture(t))
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}
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func (c *Context) TexSubImage2D(p []byte, x, y, width, height int) {
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gl := c.gl
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gl.TexSubImage2D(mgl.TEXTURE_2D, 0, x, y, width, height, mgl.RGBA, mgl.UNSIGNED_BYTE, p)
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}
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func (c *Context) NewFramebuffer(texture Texture) (Framebuffer, error) {
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gl := c.gl
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f := gl.CreateFramebuffer()
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if f.Value <= 0 {
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return Framebuffer{}, errors.New("opengl: creating framebuffer failed: gl.IsFramebuffer returns false")
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}
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c.bindFramebuffer(Framebuffer(f))
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gl.FramebufferTexture2D(mgl.FRAMEBUFFER, mgl.COLOR_ATTACHMENT0, mgl.TEXTURE_2D, mgl.Texture(texture), 0)
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s := gl.CheckFramebufferStatus(mgl.FRAMEBUFFER)
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if s != mgl.FRAMEBUFFER_COMPLETE {
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if s != 0 {
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return Framebuffer{}, fmt.Errorf("opengl: creating framebuffer failed: %v", s)
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}
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if e := gl.GetError(); e != mgl.NO_ERROR {
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return Framebuffer{}, fmt.Errorf("opengl: creating framebuffer failed: (glGetError) %d", e)
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}
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return Framebuffer{}, fmt.Errorf("opengl: creating framebuffer failed: unknown error")
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}
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return Framebuffer(f), nil
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}
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func (c *Context) setViewportImpl(width, height int) {
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gl := c.gl
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gl.Viewport(0, 0, width, height)
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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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if !gl.IsFramebuffer(mgl.Framebuffer(f)) {
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return
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}
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// If a framebuffer to be deleted is bound, a newly bound framebuffer
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// will be a default framebuffer.
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// https://www.khronos.org/opengles/sdk/docs/man/xhtml/glDeleteFramebuffers.xml
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if c.lastFramebuffer == f {
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c.lastFramebuffer = invalidFramebuffer
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c.lastViewportWidth = 0
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c.lastViewportHeight = 0
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}
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gl.DeleteFramebuffer(mgl.Framebuffer(f))
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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(mgl.Enum(shaderType))
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if s.Value == 0 {
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return Shader{}, fmt.Errorf("opengl: glCreateShader failed: shader type: %d", shaderType)
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}
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gl.ShaderSource(s, source)
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gl.CompileShader(s)
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v := gl.GetShaderi(s, mgl.COMPILE_STATUS)
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if v == mgl.FALSE {
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log := gl.GetShaderInfoLog(s)
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return Shader{}, fmt.Errorf("opengl: 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(mgl.Shader(s))
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}
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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.Value == 0 {
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return Program{}, errors.New("opengl: glCreateProgram failed")
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}
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for _, shader := range shaders {
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gl.AttachShader(p, mgl.Shader(shader))
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}
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gl.LinkProgram(p)
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v := gl.GetProgrami(p, mgl.LINK_STATUS)
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if v == mgl.FALSE {
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return Program{}, errors.New("opengl: 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(mgl.Program(p))
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}
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func (c *Context) DeleteProgram(p Program) {
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gl := c.gl
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if !gl.IsProgram(mgl.Program(p)) {
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return
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}
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gl.DeleteProgram(mgl.Program(p))
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}
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func (c *Context) getUniformLocationImpl(p Program, location string) uniformLocation {
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gl := c.gl
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u := uniformLocation(gl.GetUniformLocation(mgl.Program(p), location))
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if u.Value == -1 {
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panic("invalid uniform location: " + location)
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}
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return u
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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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gl.Uniform1i(mgl.Uniform(c.locationCache.GetUniformLocation(c, p, location)), v)
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}
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func (c *Context) UniformFloat(p Program, location string, v float32) {
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gl := c.gl
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gl.Uniform1f(mgl.Uniform(c.locationCache.GetUniformLocation(c, p, location)), 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 := mgl.Uniform(c.locationCache.GetUniformLocation(c, p, location))
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switch len(v) {
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case 2:
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gl.Uniform2fv(l, v)
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case 4:
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gl.Uniform4fv(l, v)
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case 16:
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gl.UniformMatrix4fv(l, v)
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default:
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panic("not reached")
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}
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}
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func (c *Context) getAttribLocationImpl(p Program, location string) attribLocation {
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gl := c.gl
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a := attribLocation(gl.GetAttribLocation(mgl.Program(p), location))
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if a.Value == ^uint(0) {
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panic("invalid attrib location: " + location)
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}
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return a
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}
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func (c *Context) VertexAttribPointer(p Program, location string, size int, dataType DataType, stride int, offset int) {
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gl := c.gl
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l := c.locationCache.GetAttribLocation(c, p, location)
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gl.VertexAttribPointer(mgl.Attrib(l), size, mgl.Enum(dataType), false, stride, offset)
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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 := c.locationCache.GetAttribLocation(c, p, location)
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gl.EnableVertexAttribArray(mgl.Attrib(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 := c.locationCache.GetAttribLocation(c, p, location)
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gl.DisableVertexAttribArray(mgl.Attrib(l))
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}
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func uint16ToBytes(v []uint16) []byte {
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u16h := (*reflect.SliceHeader)(unsafe.Pointer(&v))
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var b []byte
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bh := (*reflect.SliceHeader)(unsafe.Pointer(&b))
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bh.Data = u16h.Data
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bh.Len = len(v) * 2
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bh.Cap = len(v) * 2
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return b
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}
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func (c *Context) NewArrayBuffer(size int) Buffer {
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gl := c.gl
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b := gl.CreateBuffer()
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gl.BindBuffer(mgl.Enum(ArrayBuffer), b)
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gl.BufferInit(mgl.Enum(ArrayBuffer), size, mgl.Enum(DynamicDraw))
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return Buffer(b)
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}
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func (c *Context) NewElementArrayBuffer(indices []uint16) Buffer {
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gl := c.gl
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b := gl.CreateBuffer()
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gl.BindBuffer(mgl.Enum(ElementArrayBuffer), b)
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gl.BufferData(mgl.Enum(ElementArrayBuffer), uint16ToBytes(indices), mgl.Enum(StaticDraw))
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return Buffer(b)
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}
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func (c *Context) BindElementArrayBuffer(b Buffer) {
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gl := c.gl
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gl.BindBuffer(mgl.ELEMENT_ARRAY_BUFFER, mgl.Buffer(b))
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}
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func float32ToBytes(v []float32) []byte {
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f32h := (*reflect.SliceHeader)(unsafe.Pointer(&v))
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var b []byte
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bh := (*reflect.SliceHeader)(unsafe.Pointer(&b))
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bh.Data = f32h.Data
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bh.Len = len(v) * 4
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bh.Cap = len(v) * 4
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return b
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}
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func (c *Context) BufferSubData(bufferType BufferType, data []float32) {
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gl := c.gl
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gl.BufferSubData(mgl.Enum(bufferType), 0, float32ToBytes(data))
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}
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func (c *Context) DeleteBuffer(b Buffer) {
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gl := c.gl
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gl.DeleteBuffer(mgl.Buffer(b))
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}
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func (c *Context) DrawElements(mode Mode, len int, offsetInBytes int) {
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gl := c.gl
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gl.DrawElements(mgl.Enum(mode), len, mgl.UNSIGNED_SHORT, offsetInBytes)
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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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