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go-opengl-pixel
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fix Picture drawing in Canvas

This commit is contained in:
faiface 2017-03-06 16:09:09 +01:00
parent 17d1731d66
commit 53066d4759
1 changed files with 35 additions and 6 deletions
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41
pixelgl/canvas.go
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@ -96,6 +96,8 @@ func (c *Canvas) MakePicture(p pixel.Picture) pixel.TargetPicture {
return &canvasPicture{
tex: tex,
orig: pixel.V(float64(bx), float64(by)),
size: pixel.V(float64(bw), float64(bh)),
bounds: bounds,
c: c,
}
@ -216,9 +218,19 @@ func (ct *canvasTriangles) draw(cp *canvasPicture) {
} else {
cp.tex.Begin()
ct.c.s.SetUniformAttr(canvasTexOrig, mgl32.Vec2{
float32(cp.orig.X()),
float32(cp.orig.Y()),
})
ct.c.s.SetUniformAttr(canvasTexSize, mgl32.Vec2{
float32(cp.tex.Width()),
float32(cp.tex.Height()),
float32(cp.size.X()),
float32(cp.size.Y()),
})
ct.c.s.SetUniformAttr(canvasTexBounds, mgl32.Vec4{
float32(cp.bounds.X()),
float32(cp.bounds.Y()),
float32(cp.bounds.W()),
float32(cp.bounds.H()),
})
if cp.tex.Smooth() != ct.c.smooth {
@ -242,8 +254,9 @@ func (ct *canvasTriangles) Draw() {
}
type canvasPicture struct {
tex *glhf.Texture
bounds pixel.Rect
tex *glhf.Texture
orig, size pixel.Vec
bounds pixel.Rect
c *Canvas
}
@ -254,6 +267,8 @@ func (cp *canvasPicture) Bounds() pixel.Rect {
func (cp *canvasPicture) Slice(r pixel.Rect) pixel.Picture {
return &canvasPicture{
orig: cp.orig,
size: cp.size,
bounds: r,
c: cp.c,
}
@ -284,7 +299,10 @@ var canvasVertexFormat = glhf.AttrFormat{
const (
canvasTransform int = iota
canvasColorMask
canvasTexOrig
canvasTexSize
canvasTexBounds
canvasTexSubBounds
canvasOrig
canvasSize
)
@ -292,7 +310,9 @@ const (
var canvasUniformFormat = glhf.AttrFormat{
canvasTransform: {Name: "transform", Type: glhf.Mat3},
canvasColorMask: {Name: "colorMask", Type: glhf.Vec4},
canvasTexOrig: {Name: "texOrig", Type: glhf.Vec2},
canvasTexSize: {Name: "texSize", Type: glhf.Vec2},
canvasTexBounds: {Name: "texBounds", Type: glhf.Vec4},
canvasOrig: {Name: "orig", Type: glhf.Vec2},
canvasSize: {Name: "size", Type: glhf.Vec2},
}
@ -333,17 +353,26 @@ in float Intensity;
out vec4 color;
uniform vec4 colorMask;
uniform vec2 texOrig;
uniform vec2 texSize;
uniform vec4 texBounds;
uniform sampler2D tex;
void main() {
if (Intensity == 0) {
color = colorMask * Color;
} else {
vec2 t = Texture / texSize;
color = vec4(0, 0, 0, 0);
color += (1 - Intensity) * colorMask * Color;
color += Intensity * colorMask * Color * texture(tex, t);
float bx = texBounds.x;
float by = texBounds.y;
float bw = texBounds.z;
float bh = texBounds.w;
if (bx <= Texture.x && Texture.x <= bx + bw && by <= Texture.y && Texture.y <= by + bh) {
vec2 t = (Texture - texOrig) / texSize;
color += Intensity * colorMask * Color * texture(tex, t);
}
}
}
`