mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-20 13:22:19 +02:00
f5336ce7bc
Some pretty old machines don't support OpenGL 3.x or later, and in such environment, some framebuffer functions like glGenFramebuffers are not available. Instead, EXT versions can be used even on machines that don't support OpenGL 3.x. After this change, Ebiten always tries to use EXT version of framebuffer functions. I believe EXT version is always available when non-EXT version is available, so this chang eshould be safe. Fixes #602
514 lines
13 KiB
Go
514 lines
13 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 darwin freebsd linux windows
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// +build !js
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// +build !android
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// +build !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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"github.com/go-gl/gl/v2.1/gl"
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)
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type (
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Texture uint32
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Framebuffer uint32
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Shader uint32
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Program uint32
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Buffer uint32
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)
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var InvalidTexture Texture
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type (
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uniformLocation int32
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attribLocation int32
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)
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type programID uint32
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const (
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invalidTexture = 0
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invalidFramebuffer = (1 << 32) - 1
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)
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func getProgramID(p Program) programID {
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return programID(p)
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}
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func init() {
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VertexShader = gl.VERTEX_SHADER
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FragmentShader = gl.FRAGMENT_SHADER
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ArrayBuffer = gl.ARRAY_BUFFER
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ElementArrayBuffer = gl.ELEMENT_ARRAY_BUFFER
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DynamicDraw = gl.DYNAMIC_DRAW
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StaticDraw = gl.STATIC_DRAW
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Triangles = gl.TRIANGLES
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Lines = gl.LINES
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Short = gl.SHORT
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Float = gl.FLOAT
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zero = gl.ZERO
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one = gl.ONE
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srcAlpha = gl.SRC_ALPHA
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dstAlpha = gl.DST_ALPHA
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oneMinusSrcAlpha = gl.ONE_MINUS_SRC_ALPHA
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oneMinusDstAlpha = gl.ONE_MINUS_DST_ALPHA
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}
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type context struct {
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init bool
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runOnMainThread func(func() error) error
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}
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func Init(runOnMainThread func(func() error) error) {
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c := &Context{}
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c.runOnMainThread = runOnMainThread
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theContext = c
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}
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func (c *Context) runOnContextThread(f func() error) error {
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return c.runOnMainThread(f)
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}
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func (c *Context) Reset() error {
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if err := c.runOnContextThread(func() error {
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if c.init {
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return nil
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}
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// Note that this initialization must be done after Loop is called.
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if err := gl.Init(); err != nil {
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return fmt.Errorf("opengl: initializing error %v", err)
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}
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c.init = true
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return nil
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}); err != nil {
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return err
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}
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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.runOnContextThread(func() error {
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gl.Enable(gl.BLEND)
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return nil
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})
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c.BlendFunc(CompositeModeSourceOver)
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_ = c.runOnContextThread(func() error {
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f := int32(0)
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gl.GetIntegerv(gl.FRAMEBUFFER_BINDING, &f)
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c.screenFramebuffer = Framebuffer(f)
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return nil
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})
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return nil
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}
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func (c *Context) BlendFunc(mode CompositeMode) {
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_ = c.runOnContextThread(func() error {
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if c.lastCompositeMode == mode {
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return nil
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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(uint32(s), uint32(d))
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return nil
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})
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}
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func (c *Context) NewTexture(width, height int) (Texture, error) {
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var texture Texture
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if err := c.runOnContextThread(func() error {
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var t uint32
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gl.GenTextures(1, &t)
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// TODO: Use gl.IsTexture
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if t <= 0 {
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return errors.New("opengl: creating texture failed")
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}
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gl.PixelStorei(gl.UNPACK_ALIGNMENT, 4)
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texture = Texture(t)
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return nil
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}); err != nil {
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return 0, err
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}
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c.BindTexture(texture)
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_ = c.runOnContextThread(func() error {
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gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST)
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gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST)
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gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE)
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gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE)
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gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, int32(width), int32(height), 0, gl.RGBA, gl.UNSIGNED_BYTE, nil)
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return nil
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})
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return texture, nil
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}
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func (c *Context) bindFramebufferImpl(f Framebuffer) {
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_ = c.runOnContextThread(func() error {
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gl.BindFramebufferEXT(gl.FRAMEBUFFER, uint32(f))
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return nil
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})
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}
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func (c *Context) FramebufferPixels(f Framebuffer, width, height int) ([]byte, error) {
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var pixels []byte
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_ = c.runOnContextThread(func() error {
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gl.Flush()
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return nil
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})
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c.bindFramebuffer(f)
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if err := c.runOnContextThread(func() error {
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pixels = make([]byte, 4*width*height)
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gl.ReadPixels(0, 0, int32(width), int32(height), gl.RGBA, gl.UNSIGNED_BYTE, gl.Ptr(pixels))
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if e := gl.GetError(); e != gl.NO_ERROR {
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pixels = nil
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return fmt.Errorf("opengl: glReadPixels: %d", e)
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}
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return nil
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}); err != nil {
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return nil, err
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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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_ = c.runOnContextThread(func() error {
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gl.BindTexture(gl.TEXTURE_2D, uint32(t))
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return nil
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})
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}
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func (c *Context) DeleteTexture(t Texture) {
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_ = c.runOnContextThread(func() error {
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tt := uint32(t)
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if !gl.IsTexture(tt) {
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return nil
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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.DeleteTextures(1, &tt)
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return nil
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})
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}
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func (c *Context) IsTexture(t Texture) bool {
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r := false
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_ = c.runOnContextThread(func() error {
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r = gl.IsTexture(uint32(t))
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return nil
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})
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return r
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}
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func (c *Context) TexSubImage2D(p []byte, x, y, width, height int) {
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_ = c.runOnContextThread(func() error {
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gl.TexSubImage2D(gl.TEXTURE_2D, 0, int32(x), int32(y), int32(width), int32(height), gl.RGBA, gl.UNSIGNED_BYTE, gl.Ptr(p))
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return nil
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})
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}
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func (c *Context) BindScreenFramebuffer() {
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c.bindFramebuffer(c.screenFramebuffer)
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}
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func (c *Context) NewFramebuffer(texture Texture) (Framebuffer, error) {
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var framebuffer Framebuffer
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var f uint32
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if err := c.runOnContextThread(func() error {
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gl.GenFramebuffersEXT(1, &f)
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// TODO: Use gl.IsFramebuffer
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if f <= 0 {
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return errors.New("opengl: creating framebuffer failed: gl.IsFramebuffer returns false")
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}
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return nil
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}); err != nil {
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return 0, err
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}
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c.bindFramebuffer(Framebuffer(f))
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if err := c.runOnContextThread(func() error {
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gl.FramebufferTexture2DEXT(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, uint32(texture), 0)
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s := gl.CheckFramebufferStatusEXT(gl.FRAMEBUFFER)
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if s != gl.FRAMEBUFFER_COMPLETE {
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if s != 0 {
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return fmt.Errorf("opengl: creating framebuffer failed: %v", s)
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}
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if e := gl.GetError(); e != gl.NO_ERROR {
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return fmt.Errorf("opengl: creating framebuffer failed: (glGetError) %d", e)
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}
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return fmt.Errorf("opengl: creating framebuffer failed: unknown error")
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}
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framebuffer = Framebuffer(f)
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return nil
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}); err != nil {
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return 0, err
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}
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return framebuffer, nil
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}
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func (c *Context) setViewportImpl(width, height int) {
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_ = c.runOnContextThread(func() error {
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gl.Viewport(0, 0, int32(width), int32(height))
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return nil
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})
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}
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func (c *Context) DeleteFramebuffer(f Framebuffer) {
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_ = c.runOnContextThread(func() error {
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ff := uint32(f)
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if !gl.IsFramebufferEXT(ff) {
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return nil
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}
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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.DeleteFramebuffersEXT(1, &ff)
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return nil
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})
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}
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func (c *Context) NewShader(shaderType ShaderType, source string) (Shader, error) {
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var shader Shader
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if err := c.runOnContextThread(func() error {
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s := gl.CreateShader(uint32(shaderType))
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if s == 0 {
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return fmt.Errorf("opengl: glCreateShader failed: shader type: %d", shaderType)
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}
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cSources, free := gl.Strs(source + "\x00")
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gl.ShaderSource(uint32(s), 1, cSources, nil)
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free()
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gl.CompileShader(s)
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var v int32
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gl.GetShaderiv(s, gl.COMPILE_STATUS, &v)
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if v == gl.FALSE {
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log := []byte{}
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gl.GetShaderiv(uint32(s), gl.INFO_LOG_LENGTH, &v)
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if v != 0 {
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log = make([]byte, int(v))
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gl.GetShaderInfoLog(uint32(s), v, nil, (*uint8)(gl.Ptr(log)))
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}
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return fmt.Errorf("opengl: shader compile failed: %s", log)
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}
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shader = Shader(s)
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return nil
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}); err != nil {
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return 0, err
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}
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return shader, nil
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}
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func (c *Context) DeleteShader(s Shader) {
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_ = c.runOnContextThread(func() error {
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gl.DeleteShader(uint32(s))
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return nil
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})
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}
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func (c *Context) NewProgram(shaders []Shader) (Program, error) {
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var program Program
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if err := c.runOnContextThread(func() error {
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p := gl.CreateProgram()
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if p == 0 {
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return errors.New("opengl: glCreateProgram failed")
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}
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for _, shader := range shaders {
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gl.AttachShader(p, uint32(shader))
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}
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gl.LinkProgram(p)
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var v int32
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gl.GetProgramiv(p, gl.LINK_STATUS, &v)
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if v == gl.FALSE {
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return errors.New("opengl: program error")
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}
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program = Program(p)
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return nil
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}); err != nil {
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return 0, err
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}
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return program, nil
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}
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func (c *Context) UseProgram(p Program) {
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_ = c.runOnContextThread(func() error {
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gl.UseProgram(uint32(p))
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return nil
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})
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}
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func (c *Context) DeleteProgram(p Program) {
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_ = c.runOnContextThread(func() error {
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if !gl.IsProgram(uint32(p)) {
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return nil
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}
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gl.DeleteProgram(uint32(p))
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return nil
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})
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}
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func (c *Context) getUniformLocationImpl(p Program, location string) uniformLocation {
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uniform := uniformLocation(gl.GetUniformLocation(uint32(p), gl.Str(location+"\x00")))
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if uniform == -1 {
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panic("opengl: invalid uniform location: " + location)
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}
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return uniform
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}
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func (c *Context) UniformInt(p Program, location string, v int) {
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_ = c.runOnContextThread(func() error {
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l := int32(c.locationCache.GetUniformLocation(c, p, location))
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gl.Uniform1i(l, int32(v))
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return nil
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})
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}
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func (c *Context) UniformFloat(p Program, location string, v float32) {
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_ = c.runOnContextThread(func() error {
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l := int32(c.locationCache.GetUniformLocation(c, p, location))
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gl.Uniform1f(l, v)
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return nil
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})
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}
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func (c *Context) UniformFloats(p Program, location string, v []float32) {
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_ = c.runOnContextThread(func() error {
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l := int32(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, 1, (*float32)(gl.Ptr(v)))
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case 4:
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gl.Uniform4fv(l, 1, (*float32)(gl.Ptr(v)))
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case 16:
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gl.UniformMatrix4fv(l, 1, false, (*float32)(gl.Ptr(v)))
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default:
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panic("not reached")
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}
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return nil
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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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attrib := attribLocation(gl.GetAttribLocation(uint32(p), gl.Str(location+"\x00")))
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if attrib == -1 {
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panic("opengl: invalid attrib location: " + location)
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}
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return attrib
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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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_ = c.runOnContextThread(func() error {
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l := c.locationCache.GetAttribLocation(c, p, location)
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gl.VertexAttribPointer(uint32(l), int32(size), uint32(dataType), false, int32(stride), gl.PtrOffset(offset))
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return nil
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})
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}
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func (c *Context) EnableVertexAttribArray(p Program, location string) {
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_ = c.runOnContextThread(func() error {
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l := c.locationCache.GetAttribLocation(c, p, location)
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gl.EnableVertexAttribArray(uint32(l))
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return nil
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})
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}
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func (c *Context) DisableVertexAttribArray(p Program, location string) {
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_ = c.runOnContextThread(func() error {
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l := c.locationCache.GetAttribLocation(c, p, location)
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gl.DisableVertexAttribArray(uint32(l))
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return nil
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})
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}
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func (c *Context) NewArrayBuffer(size int) Buffer {
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var buffer Buffer
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_ = c.runOnContextThread(func() error {
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var b uint32
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gl.GenBuffers(1, &b)
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gl.BindBuffer(uint32(ArrayBuffer), b)
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gl.BufferData(uint32(ArrayBuffer), size, nil, uint32(DynamicDraw))
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buffer = Buffer(b)
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return nil
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})
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return buffer
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}
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func (c *Context) NewElementArrayBuffer(indices []uint16) Buffer {
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var buffer Buffer
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_ = c.runOnContextThread(func() error {
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var b uint32
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gl.GenBuffers(1, &b)
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gl.BindBuffer(uint32(ElementArrayBuffer), b)
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gl.BufferData(uint32(ElementArrayBuffer), 2*len(indices), gl.Ptr(indices), uint32(StaticDraw))
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buffer = Buffer(b)
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return nil
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})
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return buffer
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}
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func (c *Context) BindElementArrayBuffer(b Buffer) {
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_ = c.runOnContextThread(func() error {
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gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, uint32(b))
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return nil
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})
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}
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func (c *Context) BufferSubData(bufferType BufferType, data []float32) {
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_ = c.runOnContextThread(func() error {
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gl.BufferSubData(uint32(bufferType), 0, len(data)*4, gl.Ptr(data))
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return nil
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})
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}
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func (c *Context) DeleteBuffer(b Buffer) {
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_ = c.runOnContextThread(func() error {
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bb := uint32(b)
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gl.DeleteBuffers(1, &bb)
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return nil
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})
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}
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func (c *Context) DrawElements(mode Mode, len int, offsetInBytes int) {
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_ = c.runOnContextThread(func() error {
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gl.DrawElements(uint32(mode), int32(len), gl.UNSIGNED_SHORT, gl.PtrOffset(offsetInBytes))
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return nil
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})
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}
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func (c *Context) maxTextureSizeImpl() int {
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size := 0
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_ = c.runOnContextThread(func() error {
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s := int32(0)
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gl.GetIntegerv(gl.MAX_TEXTURE_SIZE, &s)
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size = int(s)
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return nil
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})
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return size
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}
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func (c *Context) Flush() {
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_ = c.runOnContextThread(func() error {
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gl.Flush()
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return nil
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})
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}
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