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clipping fixed

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This commit is contained in:
Thomas Friedel 2018-03-25 15:42:23 +02:00
parent f57765cdc5
commit 649cffa1e3
3 changed files with 22 additions and 11 deletions
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5
canvas.go
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@ -262,7 +262,10 @@ func LoadGL(glimpl GL) (err error) {
gli.Enable(gl_BLEND)
gli.BlendFunc(gl_SRC_ALPHA, gl_ONE_MINUS_SRC_ALPHA)
gli.Enable(gl_STENCIL_TEST)
gli.StencilFunc(gl_EQUAL, 1, 0x00)
gli.StencilMask(0xFF)
gli.Clear(gl_STENCIL_BUFFER_BIT)
gli.StencilOp(gl_KEEP, gl_KEEP, gl_KEEP)
gli.StencilFunc(gl_EQUAL, 0, 0xFF)
return
}

26
paths.go
View file

@ -465,17 +465,12 @@ func (cv *Canvas) Clip() {
func (cv *Canvas) clip(path []pathPoint) {
cv.activate()
gli.ColorMask(false, false, false, false)
gli.StencilFunc(gl_ALWAYS, 2, 0xFF)
gli.StencilOp(gl_REPLACE, gl_REPLACE, gl_REPLACE)
gli.StencilMask(0x02)
gli.Clear(gl_STENCIL_BUFFER_BIT)
var triBuf [1000]float32
tris := triBuf[:0]
tris = append(tris, 0, 0, float32(cv.fw), 0, float32(cv.fw), float32(cv.fh), 0, 0, float32(cv.fw), float32(cv.fh), 0, float32(cv.fh))
baseLen := len(tris)
tris = triangulatePath(path, tris)
if len(tris) > 0 {
if len(tris) <= baseLen {
return
}
@ -488,10 +483,23 @@ func (cv *Canvas) clip(path []pathPoint) {
gli.Uniform2f(sr.canvasSize, float32(cv.fw), float32(cv.fh))
gli.EnableVertexAttribArray(sr.vertex)
gli.DrawArrays(gl_TRIANGLES, 0, 6)
gli.StencilFunc(gl_ALWAYS, 0, 0xFF)
gli.ColorMask(false, false, false, false)
gli.StencilMask(0x04)
gli.StencilFunc(gl_ALWAYS, 4, 0x04)
gli.StencilOp(gl_REPLACE, gl_REPLACE, gl_REPLACE)
gli.DrawArrays(gl_TRIANGLES, 6, int32(len(tris)/2-6))
gli.StencilMask(0x02)
gli.StencilFunc(gl_EQUAL, 0, 0x06)
gli.StencilOp(gl_KEEP, gl_INVERT, gl_INVERT)
gli.DrawArrays(gl_TRIANGLES, 0, 6)
gli.StencilMask(0x04)
gli.StencilFunc(gl_ALWAYS, 0, 0x04)
gli.StencilOp(gl_ZERO, gl_ZERO, gl_ZERO)
gli.DrawArrays(gl_TRIANGLES, 0, 6)
gli.DisableVertexAttribArray(sr.vertex)
gli.ColorMask(true, true, true, true)

2
sdlcanvas/sdlcanvas.go
View file

@ -38,7 +38,7 @@ func CreateCanvasWindow(w, h int, title string) (*Window, *canvas.Canvas, error)
sdl.GL_SetAttribute(sdl.GL_BLUE_SIZE, 8)
sdl.GL_SetAttribute(sdl.GL_ALPHA_SIZE, 8)
sdl.GL_SetAttribute(sdl.GL_DEPTH_SIZE, 0)
sdl.GL_SetAttribute(sdl.GL_STENCIL_SIZE, 1)
sdl.GL_SetAttribute(sdl.GL_STENCIL_SIZE, 8)
sdl.GL_SetAttribute(sdl.GL_DOUBLEBUFFER, 1)
sdl.GL_SetAttribute(sdl.GL_MULTISAMPLEBUFFERS, 1)
sdl.GL_SetAttribute(sdl.GL_MULTISAMPLESAMPLES, 4)