context_desktop.go - twitchapon-anim - Basic Twitchapon Receiver/Visuals

context_desktop.go (15481B)
      1 // Copyright 2014 Hajime Hoshi
      2 //
      3 // Licensed under the Apache License, Version 2.0 (the "License");
      4 // you may not use this file except in compliance with the License.
      5 // You may obtain a copy of the License at
      6 //
      7 //     http://www.apache.org/licenses/LICENSE-2.0
      8 //
      9 // Unless required by applicable law or agreed to in writing, software
     10 // distributed under the License is distributed on an "AS IS" BASIS,
     11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     12 // See the License for the specific language governing permissions and
     13 // limitations under the License.
     14 
     15 // +build darwin freebsd linux windows
     16 // +build !android
     17 // +build !ios
     18 
     19 package opengl
     20 
     21 import (
     22 	"errors"
     23 	"fmt"
     24 
     25 	"github.com/hajimehoshi/ebiten/v2/internal/driver"
     26 	"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver/opengl/gl"
     27 	"github.com/hajimehoshi/ebiten/v2/internal/shaderir"
     28 )
     29 
     30 type (
     31 	textureNative     uint32
     32 	framebufferNative uint32
     33 	shader            uint32
     34 	program           uint32
     35 	buffer            uint32
     36 )
     37 
     38 func (t textureNative) equal(rhs textureNative) bool {
     39 	return t == rhs
     40 }
     41 
     42 func (f framebufferNative) equal(rhs framebufferNative) bool {
     43 	return f == rhs
     44 }
     45 
     46 func (s shader) equal(rhs shader) bool {
     47 	return s == rhs
     48 }
     49 
     50 func (b buffer) equal(rhs buffer) bool {
     51 	return b == rhs
     52 }
     53 
     54 func (u uniformLocation) equal(rhs uniformLocation) bool {
     55 	return u == rhs
     56 }
     57 
     58 func (p program) equal(rhs program) bool {
     59 	return p == rhs
     60 }
     61 
     62 var InvalidTexture textureNative
     63 
     64 type (
     65 	uniformLocation int32
     66 	attribLocation  int32
     67 )
     68 
     69 type programID uint32
     70 
     71 const (
     72 	invalidTexture     = 0
     73 	invalidFramebuffer = (1 << 32) - 1
     74 	invalidUniform     = -1
     75 )
     76 
     77 func getProgramID(p program) programID {
     78 	return programID(p)
     79 }
     80 
     81 const (
     82 	vertexShader       = shaderType(gl.VERTEX_SHADER)
     83 	fragmentShader     = shaderType(gl.FRAGMENT_SHADER)
     84 	arrayBuffer        = bufferType(gl.ARRAY_BUFFER)
     85 	elementArrayBuffer = bufferType(gl.ELEMENT_ARRAY_BUFFER)
     86 	dynamicDraw        = bufferUsage(gl.DYNAMIC_DRAW)
     87 	short              = dataType(gl.SHORT)
     88 	float              = dataType(gl.FLOAT)
     89 
     90 	zero             = operation(gl.ZERO)
     91 	one              = operation(gl.ONE)
     92 	srcAlpha         = operation(gl.SRC_ALPHA)
     93 	dstAlpha         = operation(gl.DST_ALPHA)
     94 	oneMinusSrcAlpha = operation(gl.ONE_MINUS_SRC_ALPHA)
     95 	oneMinusDstAlpha = operation(gl.ONE_MINUS_DST_ALPHA)
     96 	dstColor         = operation(gl.DST_COLOR)
     97 )
     98 
     99 type contextImpl struct {
    100 	init bool
    101 }
    102 
    103 func (c *context) reset() error {
    104 	if err := c.t.Call(func() error {
    105 		if c.init {
    106 			return nil
    107 		}
    108 		// Note that this initialization must be done after Loop is called.
    109 		if err := gl.Init(); err != nil {
    110 			return fmt.Errorf("opengl: initializing error %v", err)
    111 		}
    112 		c.init = true
    113 		return nil
    114 	}); err != nil {
    115 		return err
    116 	}
    117 	c.locationCache = newLocationCache()
    118 	c.lastTexture = invalidTexture
    119 	c.lastFramebuffer = invalidFramebuffer
    120 	c.lastViewportWidth = 0
    121 	c.lastViewportHeight = 0
    122 	c.lastCompositeMode = driver.CompositeModeUnknown
    123 	_ = c.t.Call(func() error {
    124 		gl.Enable(gl.BLEND)
    125 		return nil
    126 	})
    127 	c.blendFunc(driver.CompositeModeSourceOver)
    128 	_ = c.t.Call(func() error {
    129 		f := int32(0)
    130 		gl.GetIntegerv(gl.FRAMEBUFFER_BINDING, &f)
    131 		c.screenFramebuffer = framebufferNative(f)
    132 		return nil
    133 	})
    134 	return nil
    135 }
    136 
    137 func (c *context) blendFunc(mode driver.CompositeMode) {
    138 	_ = c.t.Call(func() error {
    139 		if c.lastCompositeMode == mode {
    140 			return nil
    141 		}
    142 		c.lastCompositeMode = mode
    143 		s, d := mode.Operations()
    144 		s2, d2 := convertOperation(s), convertOperation(d)
    145 		gl.BlendFunc(uint32(s2), uint32(d2))
    146 		return nil
    147 	})
    148 }
    149 
    150 func (c *context) newTexture(width, height int) (textureNative, error) {
    151 	var texture textureNative
    152 	if err := c.t.Call(func() error {
    153 		var t uint32
    154 		gl.GenTextures(1, &t)
    155 		// TODO: Use gl.IsTexture
    156 		if t <= 0 {
    157 			return errors.New("opengl: creating texture failed")
    158 		}
    159 		gl.PixelStorei(gl.UNPACK_ALIGNMENT, 4)
    160 		texture = textureNative(t)
    161 		return nil
    162 	}); err != nil {
    163 		return 0, err
    164 	}
    165 	c.bindTexture(texture)
    166 	_ = c.t.Call(func() error {
    167 		gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST)
    168 		gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST)
    169 		gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE)
    170 		gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE)
    171 		// If data is nil, this just allocates memory and the content is undefined.
    172 		// https://www.khronos.org/registry/OpenGL-Refpages/gl4/html/glTexImage2D.xhtml
    173 		gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, int32(width), int32(height), 0, gl.RGBA, gl.UNSIGNED_BYTE, nil)
    174 		return nil
    175 	})
    176 	return texture, nil
    177 }
    178 
    179 func (c *context) bindFramebufferImpl(f framebufferNative) {
    180 	_ = c.t.Call(func() error {
    181 		gl.BindFramebufferEXT(gl.FRAMEBUFFER, uint32(f))
    182 		return nil
    183 	})
    184 }
    185 
    186 func (c *context) framebufferPixels(f *framebuffer, width, height int) ([]byte, error) {
    187 	var pixels []byte
    188 	_ = c.t.Call(func() error {
    189 		gl.Flush()
    190 		return nil
    191 	})
    192 	c.bindFramebuffer(f.native)
    193 	if err := c.t.Call(func() error {
    194 		pixels = make([]byte, 4*width*height)
    195 		gl.ReadPixels(0, 0, int32(width), int32(height), gl.RGBA, gl.UNSIGNED_BYTE, gl.Ptr(pixels))
    196 		return nil
    197 	}); err != nil {
    198 		return nil, err
    199 	}
    200 	return pixels, nil
    201 }
    202 
    203 func (c *context) activeTexture(idx int) {
    204 	_ = c.t.Call(func() error {
    205 		gl.ActiveTexture(gl.TEXTURE0 + uint32(idx))
    206 		return nil
    207 	})
    208 }
    209 
    210 func (c *context) bindTextureImpl(t textureNative) {
    211 	_ = c.t.Call(func() error {
    212 		gl.BindTexture(gl.TEXTURE_2D, uint32(t))
    213 		return nil
    214 	})
    215 }
    216 
    217 func (c *context) deleteTexture(t textureNative) {
    218 	_ = c.t.Call(func() error {
    219 		tt := uint32(t)
    220 		if !gl.IsTexture(tt) {
    221 			return nil
    222 		}
    223 		if c.lastTexture == t {
    224 			c.lastTexture = invalidTexture
    225 		}
    226 		gl.DeleteTextures(1, &tt)
    227 		return nil
    228 	})
    229 }
    230 
    231 func (c *context) isTexture(t textureNative) bool {
    232 	panic("opengl: isTexture is not implemented")
    233 }
    234 
    235 func (c *context) newFramebuffer(texture textureNative) (framebufferNative, error) {
    236 	var framebuffer framebufferNative
    237 	var f uint32
    238 	if err := c.t.Call(func() error {
    239 		gl.GenFramebuffersEXT(1, &f)
    240 		// TODO: Use gl.IsFramebuffer
    241 		if f <= 0 {
    242 			return errors.New("opengl: creating framebuffer failed: gl.IsFramebuffer returns false")
    243 		}
    244 		return nil
    245 	}); err != nil {
    246 		return 0, err
    247 	}
    248 	c.bindFramebuffer(framebufferNative(f))
    249 	if err := c.t.Call(func() error {
    250 		gl.FramebufferTexture2DEXT(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, uint32(texture), 0)
    251 		s := gl.CheckFramebufferStatusEXT(gl.FRAMEBUFFER)
    252 		if s != gl.FRAMEBUFFER_COMPLETE {
    253 			if s != 0 {
    254 				return fmt.Errorf("opengl: creating framebuffer failed: %v", s)
    255 			}
    256 			if e := gl.GetError(); e != gl.NO_ERROR {
    257 				return fmt.Errorf("opengl: creating framebuffer failed: (glGetError) %d", e)
    258 			}
    259 			return fmt.Errorf("opengl: creating framebuffer failed: unknown error")
    260 		}
    261 		framebuffer = framebufferNative(f)
    262 		return nil
    263 	}); err != nil {
    264 		return 0, err
    265 	}
    266 	return framebuffer, nil
    267 }
    268 
    269 func (c *context) setViewportImpl(width, height int) {
    270 	_ = c.t.Call(func() error {
    271 		gl.Viewport(0, 0, int32(width), int32(height))
    272 		return nil
    273 	})
    274 }
    275 
    276 func (c *context) deleteFramebuffer(f framebufferNative) {
    277 	_ = c.t.Call(func() error {
    278 		ff := uint32(f)
    279 		if !gl.IsFramebufferEXT(ff) {
    280 			return nil
    281 		}
    282 		if c.lastFramebuffer == f {
    283 			c.lastFramebuffer = invalidFramebuffer
    284 			c.lastViewportWidth = 0
    285 			c.lastViewportHeight = 0
    286 		}
    287 		gl.DeleteFramebuffersEXT(1, &ff)
    288 		return nil
    289 	})
    290 }
    291 
    292 func (c *context) newShader(shaderType shaderType, source string) (shader, error) {
    293 	var sh shader
    294 	if err := c.t.Call(func() error {
    295 		s := gl.CreateShader(uint32(shaderType))
    296 		if s == 0 {
    297 			return fmt.Errorf("opengl: glCreateShader failed: shader type: %d", shaderType)
    298 		}
    299 		cSources, free := gl.Strs(source + "\x00")
    300 		gl.ShaderSource(uint32(s), 1, cSources, nil)
    301 		free()
    302 		gl.CompileShader(s)
    303 
    304 		var v int32
    305 		gl.GetShaderiv(s, gl.COMPILE_STATUS, &v)
    306 		if v == gl.FALSE {
    307 			var l int32
    308 			var log []byte
    309 			gl.GetShaderiv(uint32(s), gl.INFO_LOG_LENGTH, &l)
    310 			if l != 0 {
    311 				log = make([]byte, l)
    312 				gl.GetShaderInfoLog(s, l, nil, (*uint8)(gl.Ptr(log)))
    313 			}
    314 			return fmt.Errorf("opengl: shader compile failed: %s", log)
    315 		}
    316 		sh = shader(s)
    317 		return nil
    318 	}); err != nil {
    319 		return 0, err
    320 	}
    321 	return sh, nil
    322 }
    323 
    324 func (c *context) deleteShader(s shader) {
    325 	_ = c.t.Call(func() error {
    326 		gl.DeleteShader(uint32(s))
    327 		return nil
    328 	})
    329 }
    330 
    331 func (c *context) newProgram(shaders []shader, attributes []string) (program, error) {
    332 	var pr program
    333 	if err := c.t.Call(func() error {
    334 		p := gl.CreateProgram()
    335 		if p == 0 {
    336 			return errors.New("opengl: glCreateProgram failed")
    337 		}
    338 
    339 		for _, shader := range shaders {
    340 			gl.AttachShader(p, uint32(shader))
    341 		}
    342 
    343 		for i, name := range attributes {
    344 			l, free := gl.Strs(name + "\x00")
    345 			gl.BindAttribLocation(p, uint32(i), *l)
    346 			free()
    347 		}
    348 
    349 		gl.LinkProgram(p)
    350 		var v int32
    351 		gl.GetProgramiv(p, gl.LINK_STATUS, &v)
    352 		if v == gl.FALSE {
    353 			var l int32
    354 			var log []byte
    355 			gl.GetProgramiv(p, gl.INFO_LOG_LENGTH, &l)
    356 			if l != 0 {
    357 				log = make([]byte, l)
    358 				gl.GetProgramInfoLog(p, l, nil, (*uint8)(gl.Ptr(log)))
    359 			}
    360 			return fmt.Errorf("opengl: program error: %s", log)
    361 		}
    362 		pr = program(p)
    363 		return nil
    364 	}); err != nil {
    365 		return 0, err
    366 	}
    367 	return pr, nil
    368 }
    369 
    370 func (c *context) useProgram(p program) {
    371 	_ = c.t.Call(func() error {
    372 		gl.UseProgram(uint32(p))
    373 		return nil
    374 	})
    375 }
    376 
    377 func (c *context) deleteProgram(p program) {
    378 	_ = c.t.Call(func() error {
    379 		if !gl.IsProgram(uint32(p)) {
    380 			return nil
    381 		}
    382 		gl.DeleteProgram(uint32(p))
    383 		return nil
    384 	})
    385 }
    386 
    387 func (c *context) getUniformLocationImpl(p program, location string) uniformLocation {
    388 	l, free := gl.Strs(location + "\x00")
    389 	uniform := uniformLocation(gl.GetUniformLocation(uint32(p), *l))
    390 	free()
    391 	return uniform
    392 }
    393 
    394 func (c *context) uniformInt(p program, location string, v int) bool {
    395 	var r bool
    396 	_ = c.t.Call(func() error {
    397 		l := int32(c.locationCache.GetUniformLocation(c, p, location))
    398 		if l == invalidUniform {
    399 			return nil
    400 		}
    401 		r = true
    402 		gl.Uniform1i(l, int32(v))
    403 		return nil
    404 	})
    405 	return r
    406 }
    407 
    408 func (c *context) uniformFloat(p program, location string, v float32) bool {
    409 	var r bool
    410 	_ = c.t.Call(func() error {
    411 		l := int32(c.locationCache.GetUniformLocation(c, p, location))
    412 		if l == invalidUniform {
    413 			return nil
    414 		}
    415 		r = true
    416 		gl.Uniform1f(l, v)
    417 		return nil
    418 	})
    419 	return r
    420 }
    421 
    422 func (c *context) uniformFloats(p program, location string, v []float32, typ shaderir.Type) bool {
    423 	var r bool
    424 	_ = c.t.Call(func() error {
    425 		l := int32(c.locationCache.GetUniformLocation(c, p, location))
    426 		if l == invalidUniform {
    427 			return nil
    428 		}
    429 		r = true
    430 
    431 		base := typ.Main
    432 		len := int32(1)
    433 		if base == shaderir.Array {
    434 			base = typ.Sub[0].Main
    435 			len = int32(typ.Length)
    436 		}
    437 
    438 		switch base {
    439 		case shaderir.Float:
    440 			gl.Uniform1fv(l, len, (*float32)(gl.Ptr(v)))
    441 		case shaderir.Vec2:
    442 			gl.Uniform2fv(l, len, (*float32)(gl.Ptr(v)))
    443 		case shaderir.Vec3:
    444 			gl.Uniform3fv(l, len, (*float32)(gl.Ptr(v)))
    445 		case shaderir.Vec4:
    446 			gl.Uniform4fv(l, len, (*float32)(gl.Ptr(v)))
    447 		case shaderir.Mat2:
    448 			gl.UniformMatrix2fv(l, len, false, (*float32)(gl.Ptr(v)))
    449 		case shaderir.Mat3:
    450 			gl.UniformMatrix3fv(l, len, false, (*float32)(gl.Ptr(v)))
    451 		case shaderir.Mat4:
    452 			gl.UniformMatrix4fv(l, len, false, (*float32)(gl.Ptr(v)))
    453 		default:
    454 			panic(fmt.Sprintf("opengl: unexpected type: %s", typ.String()))
    455 		}
    456 		return nil
    457 	})
    458 	return r
    459 }
    460 
    461 func (c *context) vertexAttribPointer(p program, index int, size int, dataType dataType, stride int, offset int) {
    462 	_ = c.t.Call(func() error {
    463 		gl.VertexAttribPointer(uint32(index), int32(size), uint32(dataType), false, int32(stride), uintptr(offset))
    464 		return nil
    465 	})
    466 }
    467 
    468 func (c *context) enableVertexAttribArray(p program, index int) {
    469 	_ = c.t.Call(func() error {
    470 		gl.EnableVertexAttribArray(uint32(index))
    471 		return nil
    472 	})
    473 }
    474 
    475 func (c *context) disableVertexAttribArray(p program, index int) {
    476 	_ = c.t.Call(func() error {
    477 		gl.DisableVertexAttribArray(uint32(index))
    478 		return nil
    479 	})
    480 }
    481 
    482 func (c *context) newArrayBuffer(size int) buffer {
    483 	var bf buffer
    484 	_ = c.t.Call(func() error {
    485 		var b uint32
    486 		gl.GenBuffers(1, &b)
    487 		gl.BindBuffer(uint32(arrayBuffer), b)
    488 		gl.BufferData(uint32(arrayBuffer), size, nil, uint32(dynamicDraw))
    489 		bf = buffer(b)
    490 		return nil
    491 	})
    492 	return bf
    493 }
    494 
    495 func (c *context) newElementArrayBuffer(size int) buffer {
    496 	var bf buffer
    497 	_ = c.t.Call(func() error {
    498 		var b uint32
    499 		gl.GenBuffers(1, &b)
    500 		gl.BindBuffer(uint32(elementArrayBuffer), b)
    501 		gl.BufferData(uint32(elementArrayBuffer), size, nil, uint32(dynamicDraw))
    502 		bf = buffer(b)
    503 		return nil
    504 	})
    505 	return bf
    506 }
    507 
    508 func (c *context) bindBuffer(bufferType bufferType, b buffer) {
    509 	_ = c.t.Call(func() error {
    510 		gl.BindBuffer(uint32(bufferType), uint32(b))
    511 		return nil
    512 	})
    513 }
    514 
    515 func (c *context) arrayBufferSubData(data []float32) {
    516 	_ = c.t.Call(func() error {
    517 		gl.BufferSubData(uint32(arrayBuffer), 0, len(data)*4, gl.Ptr(data))
    518 		return nil
    519 	})
    520 }
    521 
    522 func (c *context) elementArrayBufferSubData(data []uint16) {
    523 	_ = c.t.Call(func() error {
    524 		gl.BufferSubData(uint32(elementArrayBuffer), 0, len(data)*2, gl.Ptr(data))
    525 		return nil
    526 	})
    527 }
    528 
    529 func (c *context) deleteBuffer(b buffer) {
    530 	_ = c.t.Call(func() error {
    531 		bb := uint32(b)
    532 		gl.DeleteBuffers(1, &bb)
    533 		return nil
    534 	})
    535 }
    536 
    537 func (c *context) drawElements(len int, offsetInBytes int) {
    538 	_ = c.t.Call(func() error {
    539 		gl.DrawElements(gl.TRIANGLES, int32(len), gl.UNSIGNED_SHORT, uintptr(offsetInBytes))
    540 		return nil
    541 	})
    542 }
    543 
    544 func (c *context) maxTextureSizeImpl() int {
    545 	size := 0
    546 	_ = c.t.Call(func() error {
    547 		s := int32(0)
    548 		gl.GetIntegerv(gl.MAX_TEXTURE_SIZE, &s)
    549 		size = int(s)
    550 		return nil
    551 	})
    552 	return size
    553 }
    554 
    555 func (c *context) getShaderPrecisionFormatPrecision() int {
    556 	// glGetShaderPrecisionFormat is not defined at OpenGL 2.0. Assume that desktop environments always have
    557 	// enough highp precision.
    558 	return highpPrecision
    559 }
    560 
    561 func (c *context) flush() {
    562 	_ = c.t.Call(func() error {
    563 		gl.Flush()
    564 		return nil
    565 	})
    566 }
    567 
    568 func (c *context) needsRestoring() bool {
    569 	return false
    570 }
    571 
    572 func (c *context) canUsePBO() bool {
    573 	var available bool
    574 	_ = c.t.Call(func() error {
    575 		available = isPBOAvailable()
    576 		return nil
    577 	})
    578 
    579 	return available
    580 }
    581 
    582 func (c *context) texSubImage2D(t textureNative, width, height int, args []*driver.ReplacePixelsArgs) {
    583 	c.bindTexture(t)
    584 	_ = c.t.Call(func() error {
    585 		for _, a := range args {
    586 			gl.TexSubImage2D(gl.TEXTURE_2D, 0, int32(a.X), int32(a.Y), int32(a.Width), int32(a.Height), gl.RGBA, gl.UNSIGNED_BYTE, gl.Ptr(a.Pixels))
    587 		}
    588 		return nil
    589 	})
    590 }
    591 
    592 func (c *context) newPixelBufferObject(width, height int) buffer {
    593 	var bf buffer
    594 	_ = c.t.Call(func() error {
    595 		var b uint32
    596 		gl.GenBuffers(1, &b)
    597 		gl.BindBuffer(gl.PIXEL_UNPACK_BUFFER, b)
    598 		gl.BufferData(gl.PIXEL_UNPACK_BUFFER, 4*width*height, nil, gl.STREAM_DRAW)
    599 		gl.BindBuffer(gl.PIXEL_UNPACK_BUFFER, 0)
    600 		bf = buffer(b)
    601 		return nil
    602 	})
    603 	return bf
    604 }
    605 
    606 func (c *context) replacePixelsWithPBO(buffer buffer, t textureNative, width, height int, args []*driver.ReplacePixelsArgs) {
    607 	c.bindTexture(t)
    608 	_ = c.t.Call(func() error {
    609 		gl.BindBuffer(gl.PIXEL_UNPACK_BUFFER, uint32(buffer))
    610 
    611 		stride := 4 * width
    612 		for _, a := range args {
    613 			offset := 4 * (a.Y*width + a.X)
    614 			for j := 0; j < a.Height; j++ {
    615 				gl.BufferSubData(gl.PIXEL_UNPACK_BUFFER, offset+stride*j, 4*a.Width, gl.Ptr(a.Pixels[4*a.Width*j:4*a.Width*(j+1)]))
    616 			}
    617 		}
    618 
    619 		gl.TexSubImage2D(gl.TEXTURE_2D, 0, 0, 0, int32(width), int32(height), gl.RGBA, gl.UNSIGNED_BYTE, nil)
    620 		gl.BindBuffer(gl.PIXEL_UNPACK_BUFFER, 0)
    621 		return nil
    622 	})
    623 }
	twitchapon-anim Basic Twitchapon Receiver/Visuals
	git clone git://bsandro.tech/twitchapon-anim
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