mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-25 03:08:54 +01:00
409 lines
10 KiB
Go
409 lines
10 KiB
Go
// 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 android ios darwin,arm darwin,arm64
|
|
|
|
package opengl
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
|
|
mgl "golang.org/x/mobile/gl"
|
|
)
|
|
|
|
type Texture mgl.Texture
|
|
type Framebuffer mgl.Framebuffer
|
|
type Shader mgl.Shader
|
|
type Program mgl.Program
|
|
type Buffer mgl.Buffer
|
|
|
|
type uniformLocation mgl.Uniform
|
|
type attribLocation mgl.Attrib
|
|
|
|
type programID uint32
|
|
|
|
var invalidFramebuffer = Framebuffer(mgl.Framebuffer{(1 << 32) - 1})
|
|
|
|
func (p Program) id() programID {
|
|
return programID(p.Value)
|
|
}
|
|
|
|
func init() {
|
|
Nearest = mgl.NEAREST
|
|
Linear = mgl.LINEAR
|
|
VertexShader = mgl.VERTEX_SHADER
|
|
FragmentShader = mgl.FRAGMENT_SHADER
|
|
ArrayBuffer = mgl.ARRAY_BUFFER
|
|
ElementArrayBuffer = mgl.ELEMENT_ARRAY_BUFFER
|
|
DynamicDraw = mgl.DYNAMIC_DRAW
|
|
StaticDraw = mgl.STATIC_DRAW
|
|
Triangles = mgl.TRIANGLES
|
|
Lines = mgl.LINES
|
|
|
|
zero = mgl.ZERO
|
|
one = mgl.ONE
|
|
srcAlpha = mgl.SRC_ALPHA
|
|
dstAlpha = mgl.DST_ALPHA
|
|
oneMinusSrcAlpha = mgl.ONE_MINUS_SRC_ALPHA
|
|
oneMinusDstAlpha = mgl.ONE_MINUS_DST_ALPHA
|
|
}
|
|
|
|
type context struct {
|
|
gl mgl.Context
|
|
worker mgl.Worker
|
|
}
|
|
|
|
func NewContext() (*Context, error) {
|
|
c := &Context{}
|
|
c.gl, c.worker = mgl.NewContext()
|
|
return c, nil
|
|
}
|
|
|
|
func (c *Context) DoWork(chError <-chan error, chDone <-chan struct{}) error {
|
|
// TODO: Check this is called on the rendering thread
|
|
loop:
|
|
for {
|
|
select {
|
|
case err := <-chError:
|
|
return err
|
|
case <-c.worker.WorkAvailable():
|
|
c.worker.DoWork()
|
|
default:
|
|
select {
|
|
case <-chDone:
|
|
break loop
|
|
default:
|
|
}
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (c *Context) Reset() error {
|
|
c.locationCache = newLocationCache()
|
|
c.lastFramebuffer = invalidFramebuffer
|
|
c.lastViewportWidth = 0
|
|
c.lastViewportHeight = 0
|
|
c.lastCompositeMode = CompositeModeUnknown
|
|
c.gl.Enable(mgl.BLEND)
|
|
c.BlendFunc(CompositeModeSourceOver)
|
|
f := c.gl.GetInteger(mgl.FRAMEBUFFER_BINDING)
|
|
c.screenFramebuffer = Framebuffer(mgl.Framebuffer{uint32(f)})
|
|
// TODO: Need to update screenFramebufferWidth/Height?
|
|
return nil
|
|
}
|
|
|
|
func (c *Context) BlendFunc(mode CompositeMode) {
|
|
gl := c.gl
|
|
if c.lastCompositeMode == mode {
|
|
return
|
|
}
|
|
c.lastCompositeMode = mode
|
|
s, d := operations(mode)
|
|
gl.BlendFunc(mgl.Enum(s), mgl.Enum(d))
|
|
}
|
|
|
|
func (c *Context) NewTexture(width, height int, pixels []uint8, filter Filter) (Texture, error) {
|
|
gl := c.gl
|
|
t := gl.CreateTexture()
|
|
if t.Value <= 0 {
|
|
return Texture{}, errors.New("opengl: creating texture failed")
|
|
}
|
|
gl.PixelStorei(mgl.UNPACK_ALIGNMENT, 4)
|
|
gl.BindTexture(mgl.TEXTURE_2D, t)
|
|
|
|
gl.TexParameteri(mgl.TEXTURE_2D, mgl.TEXTURE_MAG_FILTER, int(filter))
|
|
gl.TexParameteri(mgl.TEXTURE_2D, mgl.TEXTURE_MIN_FILTER, int(filter))
|
|
|
|
var p []uint8
|
|
if pixels != nil {
|
|
p = pixels
|
|
}
|
|
gl.TexImage2D(mgl.TEXTURE_2D, 0, width, height, mgl.RGBA, mgl.UNSIGNED_BYTE, p)
|
|
|
|
return Texture(t), nil
|
|
}
|
|
|
|
func (c *Context) bindFramebufferImpl(f Framebuffer) error {
|
|
gl := c.gl
|
|
gl.BindFramebuffer(mgl.FRAMEBUFFER, mgl.Framebuffer(f))
|
|
return nil
|
|
}
|
|
|
|
func (c *Context) FramebufferPixels(f Framebuffer, width, height int) ([]uint8, error) {
|
|
gl := c.gl
|
|
gl.Flush()
|
|
|
|
c.bindFramebuffer(f)
|
|
|
|
pixels := make([]uint8, 4*width*height)
|
|
gl.ReadPixels(pixels, 0, 0, width, height, mgl.RGBA, mgl.UNSIGNED_BYTE)
|
|
if e := gl.GetError(); e != mgl.NO_ERROR {
|
|
return nil, fmt.Errorf("opengl: glReadPixels: %d", e)
|
|
}
|
|
return pixels, nil
|
|
}
|
|
|
|
func (c *Context) BindTexture(t Texture) {
|
|
gl := c.gl
|
|
gl.BindTexture(mgl.TEXTURE_2D, mgl.Texture(t))
|
|
}
|
|
|
|
func (c *Context) DeleteTexture(t Texture) {
|
|
gl := c.gl
|
|
if !gl.IsTexture(mgl.Texture(t)) {
|
|
return
|
|
}
|
|
gl.DeleteTexture(mgl.Texture(t))
|
|
}
|
|
|
|
func (c *Context) IsTexture(t Texture) bool {
|
|
gl := c.gl
|
|
return gl.IsTexture(mgl.Texture(t))
|
|
}
|
|
|
|
func (c *Context) TexSubImage2D(p []uint8, width, height int) {
|
|
gl := c.gl
|
|
gl.TexSubImage2D(mgl.TEXTURE_2D, 0, 0, 0, width, height, mgl.RGBA, mgl.UNSIGNED_BYTE, p)
|
|
}
|
|
|
|
func (c *Context) BindScreenFramebuffer() error {
|
|
return c.bindFramebuffer(c.screenFramebuffer)
|
|
}
|
|
|
|
func (c *Context) NewFramebuffer(texture Texture) (Framebuffer, error) {
|
|
gl := c.gl
|
|
f := gl.CreateFramebuffer()
|
|
if f.Value <= 0 {
|
|
return Framebuffer{}, errors.New("opengl: creating framebuffer failed: gl.IsFramebuffer returns false")
|
|
}
|
|
c.bindFramebuffer(Framebuffer(f))
|
|
|
|
gl.FramebufferTexture2D(mgl.FRAMEBUFFER, mgl.COLOR_ATTACHMENT0, mgl.TEXTURE_2D, mgl.Texture(texture), 0)
|
|
s := gl.CheckFramebufferStatus(mgl.FRAMEBUFFER)
|
|
if s != mgl.FRAMEBUFFER_COMPLETE {
|
|
if s != 0 {
|
|
return Framebuffer{}, fmt.Errorf("opengl: creating framebuffer failed: %v", s)
|
|
}
|
|
if e := gl.GetError(); e != mgl.NO_ERROR {
|
|
return Framebuffer{}, fmt.Errorf("opengl: creating framebuffer failed: (glGetError) %d", e)
|
|
}
|
|
return Framebuffer{}, fmt.Errorf("opengl: creating framebuffer failed: unknown error")
|
|
}
|
|
return Framebuffer(f), nil
|
|
}
|
|
|
|
func (c *Context) setViewportImpl(width, height int) error {
|
|
gl := c.gl
|
|
gl.Viewport(0, 0, width, height)
|
|
return nil
|
|
}
|
|
|
|
func (c *Context) FillFramebuffer(r, g, b, a float64) error {
|
|
gl := c.gl
|
|
gl.ClearColor(float32(r), float32(g), float32(b), float32(a))
|
|
gl.Clear(mgl.COLOR_BUFFER_BIT)
|
|
return nil
|
|
}
|
|
|
|
func (c *Context) DeleteFramebuffer(f Framebuffer) {
|
|
gl := c.gl
|
|
if !gl.IsFramebuffer(mgl.Framebuffer(f)) {
|
|
return
|
|
}
|
|
// If a framebuffer to be delted is bound, a newly bound framebuffer
|
|
// will be a default framebuffer.
|
|
// https://www.khronos.org/opengles/sdk/docs/man/xhtml/glDeleteFramebuffers.xml
|
|
if c.lastFramebuffer == f {
|
|
c.lastFramebuffer = invalidFramebuffer
|
|
c.lastViewportWidth = 0
|
|
c.lastViewportHeight = 0
|
|
}
|
|
gl.DeleteFramebuffer(mgl.Framebuffer(f))
|
|
}
|
|
|
|
func (c *Context) NewShader(shaderType ShaderType, source string) (Shader, error) {
|
|
gl := c.gl
|
|
s := gl.CreateShader(mgl.Enum(shaderType))
|
|
if s.Value == 0 {
|
|
return Shader{}, errors.New("opengl: glCreateShader failed")
|
|
}
|
|
gl.ShaderSource(s, source)
|
|
gl.CompileShader(s)
|
|
|
|
v := gl.GetShaderi(s, mgl.COMPILE_STATUS)
|
|
if v == mgl.FALSE {
|
|
log := gl.GetShaderInfoLog(s)
|
|
return Shader{}, fmt.Errorf("opengl: shader compile failed: %s", log)
|
|
}
|
|
return Shader(s), nil
|
|
}
|
|
|
|
func (c *Context) DeleteShader(s Shader) {
|
|
gl := c.gl
|
|
gl.DeleteShader(mgl.Shader(s))
|
|
}
|
|
|
|
func (c *Context) GlslHighpSupported() bool {
|
|
gl := c.gl
|
|
_, _, precision := gl.GetShaderPrecisionFormat(mgl.FRAGMENT_SHADER, mgl.HIGH_FLOAT)
|
|
// On Android emulators, precision might be a wrong value (#239).
|
|
// TODO: If possible, check if this is running on an emulator.
|
|
if 64 <= precision {
|
|
return false
|
|
}
|
|
return precision != 0
|
|
}
|
|
|
|
func (c *Context) NewProgram(shaders []Shader) (Program, error) {
|
|
gl := c.gl
|
|
p := gl.CreateProgram()
|
|
if p.Value == 0 {
|
|
return Program{}, errors.New("opengl: glCreateProgram failed")
|
|
}
|
|
|
|
for _, shader := range shaders {
|
|
gl.AttachShader(p, mgl.Shader(shader))
|
|
}
|
|
gl.LinkProgram(p)
|
|
v := gl.GetProgrami(p, mgl.LINK_STATUS)
|
|
if v == mgl.FALSE {
|
|
return Program{}, errors.New("opengl: program error")
|
|
}
|
|
return Program(p), nil
|
|
}
|
|
|
|
func (c *Context) UseProgram(p Program) {
|
|
gl := c.gl
|
|
gl.UseProgram(mgl.Program(p))
|
|
}
|
|
|
|
func (c *Context) DeleteProgram(p Program) {
|
|
gl := c.gl
|
|
gl.DeleteProgram(mgl.Program(p))
|
|
}
|
|
|
|
func (c *Context) getUniformLocationImpl(p Program, location string) uniformLocation {
|
|
gl := c.gl
|
|
u := uniformLocation(gl.GetUniformLocation(mgl.Program(p), location))
|
|
if u.Value == -1 {
|
|
panic("invalid uniform location: " + location)
|
|
}
|
|
return u
|
|
}
|
|
|
|
func (c *Context) UniformInt(p Program, location string, v int) {
|
|
gl := c.gl
|
|
gl.Uniform1i(mgl.Uniform(c.locationCache.GetUniformLocation(c, p, location)), v)
|
|
}
|
|
|
|
func (c *Context) UniformFloats(p Program, location string, v []float32) {
|
|
gl := c.gl
|
|
l := mgl.Uniform(c.locationCache.GetUniformLocation(c, p, location))
|
|
switch len(v) {
|
|
case 4:
|
|
gl.Uniform4fv(l, v)
|
|
case 16:
|
|
gl.UniformMatrix4fv(l, v)
|
|
default:
|
|
panic("not reach")
|
|
}
|
|
}
|
|
|
|
func (c *Context) getAttribLocationImpl(p Program, location string) attribLocation {
|
|
gl := c.gl
|
|
a := attribLocation(gl.GetAttribLocation(mgl.Program(p), location))
|
|
if a.Value == ^uint(0) {
|
|
panic("invalid attrib location: " + location)
|
|
}
|
|
return a
|
|
}
|
|
|
|
func (c *Context) VertexAttribPointer(p Program, location string, normalize bool, stride int, size int, v int) {
|
|
gl := c.gl
|
|
l := c.locationCache.GetAttribLocation(c, p, location)
|
|
gl.VertexAttribPointer(mgl.Attrib(l), size, mgl.SHORT, normalize, stride, v)
|
|
}
|
|
|
|
func (c *Context) EnableVertexAttribArray(p Program, location string) {
|
|
gl := c.gl
|
|
l := c.locationCache.GetAttribLocation(c, p, location)
|
|
gl.EnableVertexAttribArray(mgl.Attrib(l))
|
|
}
|
|
|
|
func (c *Context) DisableVertexAttribArray(p Program, location string) {
|
|
gl := c.gl
|
|
l := c.locationCache.GetAttribLocation(c, p, location)
|
|
gl.DisableVertexAttribArray(mgl.Attrib(l))
|
|
}
|
|
|
|
func uint16ToBytes(v []uint16) []byte {
|
|
b := make([]byte, len(v)*2)
|
|
for i, x := range v {
|
|
b[2*i] = byte(x)
|
|
b[2*i+1] = byte(x >> 8)
|
|
}
|
|
return b
|
|
}
|
|
|
|
func int16ToBytes(v []int16) []byte {
|
|
b := make([]byte, len(v)*2)
|
|
for i, x := range v {
|
|
b[2*i] = byte(uint16(x))
|
|
b[2*i+1] = byte(uint16(x) >> 8)
|
|
}
|
|
return b
|
|
}
|
|
|
|
func (c *Context) NewBuffer(bufferType BufferType, v interface{}, bufferUsage BufferUsage) Buffer {
|
|
gl := c.gl
|
|
b := gl.CreateBuffer()
|
|
gl.BindBuffer(mgl.Enum(bufferType), b)
|
|
switch v := v.(type) {
|
|
case int:
|
|
gl.BufferInit(mgl.Enum(bufferType), v, mgl.Enum(bufferUsage))
|
|
case []uint16:
|
|
gl.BufferData(mgl.Enum(bufferType), uint16ToBytes(v), mgl.Enum(bufferUsage))
|
|
default:
|
|
panic("not reach")
|
|
}
|
|
return Buffer(b)
|
|
}
|
|
|
|
func (c *Context) BindElementArrayBuffer(b Buffer) {
|
|
gl := c.gl
|
|
gl.BindBuffer(mgl.ELEMENT_ARRAY_BUFFER, mgl.Buffer(b))
|
|
}
|
|
|
|
func (c *Context) BufferSubData(bufferType BufferType, data []int16) {
|
|
gl := c.gl
|
|
gl.BufferSubData(mgl.Enum(bufferType), 0, int16ToBytes(data))
|
|
}
|
|
|
|
func (c *Context) DeleteBuffer(b Buffer) {
|
|
gl := c.gl
|
|
gl.DeleteBuffer(mgl.Buffer(b))
|
|
}
|
|
|
|
func (c *Context) DrawElements(mode Mode, len int, offsetInBytes int) {
|
|
gl := c.gl
|
|
gl.DrawElements(mgl.Enum(mode), len, mgl.UNSIGNED_SHORT, offsetInBytes)
|
|
}
|
|
|
|
func (c *Context) Flush() {
|
|
gl := c.gl
|
|
gl.Flush()
|
|
}
|