diff options
Diffstat (limited to 'vendor/gioui.org/gpu/internal/driver/driver.go')
| -rw-r--r-- | vendor/gioui.org/gpu/internal/driver/driver.go | 237 |
1 files changed, 237 insertions, 0 deletions
diff --git a/vendor/gioui.org/gpu/internal/driver/driver.go b/vendor/gioui.org/gpu/internal/driver/driver.go new file mode 100644 index 0000000..58cb89b --- /dev/null +++ b/vendor/gioui.org/gpu/internal/driver/driver.go @@ -0,0 +1,237 @@ +// SPDX-License-Identifier: Unlicense OR MIT + +package driver + +import ( + "errors" + "image" + "time" + + "gioui.org/internal/f32color" + "gioui.org/shader" +) + +// Device represents the abstraction of underlying GPU +// APIs such as OpenGL, Direct3D useful for rendering Gio +// operations. +type Device interface { + BeginFrame(target RenderTarget, clear bool, viewport image.Point) Texture + EndFrame() + Caps() Caps + NewTimer() Timer + // IsContinuousTime reports whether all timer measurements + // are valid at the point of call. + IsTimeContinuous() bool + NewTexture(format TextureFormat, width, height int, minFilter, magFilter TextureFilter, bindings BufferBinding) (Texture, error) + NewImmutableBuffer(typ BufferBinding, data []byte) (Buffer, error) + NewBuffer(typ BufferBinding, size int) (Buffer, error) + NewComputeProgram(shader shader.Sources) (Program, error) + NewVertexShader(src shader.Sources) (VertexShader, error) + NewFragmentShader(src shader.Sources) (FragmentShader, error) + NewPipeline(desc PipelineDesc) (Pipeline, error) + + Viewport(x, y, width, height int) + DrawArrays(off, count int) + DrawElements(off, count int) + + BeginRenderPass(t Texture, desc LoadDesc) + EndRenderPass() + PrepareTexture(t Texture) + BindProgram(p Program) + BindPipeline(p Pipeline) + BindTexture(unit int, t Texture) + BindVertexBuffer(b Buffer, offset int) + BindIndexBuffer(b Buffer) + BindImageTexture(unit int, texture Texture) + BindUniforms(buf Buffer) + BindStorageBuffer(binding int, buf Buffer) + + BeginCompute() + EndCompute() + CopyTexture(dst Texture, dstOrigin image.Point, src Texture, srcRect image.Rectangle) + DispatchCompute(x, y, z int) + + Release() +} + +var ErrDeviceLost = errors.New("GPU device lost") + +type LoadDesc struct { + Action LoadAction + ClearColor f32color.RGBA +} + +type Pipeline interface { + Release() +} + +type PipelineDesc struct { + VertexShader VertexShader + FragmentShader FragmentShader + VertexLayout VertexLayout + BlendDesc BlendDesc + PixelFormat TextureFormat + Topology Topology +} + +type VertexLayout struct { + Inputs []InputDesc + Stride int +} + +// InputDesc describes a vertex attribute as laid out in a Buffer. +type InputDesc struct { + Type shader.DataType + Size int + + Offset int +} + +type BlendDesc struct { + Enable bool + SrcFactor, DstFactor BlendFactor +} + +type BlendFactor uint8 + +type Topology uint8 + +type TextureFilter uint8 +type TextureFormat uint8 + +type BufferBinding uint8 + +type LoadAction uint8 + +type Features uint + +type Caps struct { + // BottomLeftOrigin is true if the driver has the origin in the lower left + // corner. The OpenGL driver returns true. + BottomLeftOrigin bool + Features Features + MaxTextureSize int +} + +type VertexShader interface { + Release() +} + +type FragmentShader interface { + Release() +} + +type Program interface { + Release() +} + +type Buffer interface { + Release() + Upload(data []byte) + Download(data []byte) error +} + +type Timer interface { + Begin() + End() + Duration() (time.Duration, bool) + Release() +} + +type Texture interface { + RenderTarget + Upload(offset, size image.Point, pixels []byte, stride int) + ReadPixels(src image.Rectangle, pixels []byte, stride int) error + Release() +} + +const ( + BufferBindingIndices BufferBinding = 1 << iota + BufferBindingVertices + BufferBindingUniforms + BufferBindingTexture + BufferBindingFramebuffer + BufferBindingShaderStorageRead + BufferBindingShaderStorageWrite +) + +const ( + TextureFormatSRGBA TextureFormat = iota + TextureFormatFloat + TextureFormatRGBA8 + // TextureFormatOutput denotes the format used by the output framebuffer. + TextureFormatOutput +) + +const ( + FilterNearest TextureFilter = iota + FilterLinear +) + +const ( + FeatureTimers Features = 1 << iota + FeatureFloatRenderTargets + FeatureCompute + FeatureSRGB +) + +const ( + TopologyTriangleStrip Topology = iota + TopologyTriangles +) + +const ( + BlendFactorOne BlendFactor = iota + BlendFactorOneMinusSrcAlpha + BlendFactorZero + BlendFactorDstColor +) + +const ( + LoadActionKeep LoadAction = iota + LoadActionClear + LoadActionInvalidate +) + +var ErrContentLost = errors.New("buffer content lost") + +func (f Features) Has(feats Features) bool { + return f&feats == feats +} + +func DownloadImage(d Device, t Texture, img *image.RGBA) error { + r := img.Bounds() + if err := t.ReadPixels(r, img.Pix, img.Stride); err != nil { + return err + } + if d.Caps().BottomLeftOrigin { + // OpenGL origin is in the lower-left corner. Flip the image to + // match. + flipImageY(r.Dx()*4, r.Dy(), img.Pix) + } + return nil +} + +func flipImageY(stride, height int, pixels []byte) { + // Flip image in y-direction. OpenGL's origin is in the lower + // left corner. + row := make([]uint8, stride) + for y := 0; y < height/2; y++ { + y1 := height - y - 1 + dest := y1 * stride + src := y * stride + copy(row, pixels[dest:]) + copy(pixels[dest:], pixels[src:src+len(row)]) + copy(pixels[src:], row) + } +} + +func UploadImage(t Texture, offset image.Point, img *image.RGBA) { + var pixels []byte + size := img.Bounds().Size() + min := img.Rect.Min + start := img.PixOffset(min.X, min.Y) + end := img.PixOffset(min.X+size.X, min.Y+size.Y-1) + pixels = img.Pix[start:end] + t.Upload(offset, size, pixels, img.Stride) +} |