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graphicscommand: Adjust texels

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This commit is contained in:
Hajime Hoshi 2020-05-30 22:39:39 +09:00
parent 1da6dbcb29
commit eb1b06c326
1 changed files with 27 additions and 15 deletions
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42
internal/graphicscommand/command.go
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@ -207,6 +207,11 @@ func fract(x float32) float32 {
return x - float32(math.Floor(float64(x)))
}
const (
dstAdjustmentFactor = 1.0 / 256.0
texelAdjustmentFactor = 1.0 / 512.0
)
// Flush flushes the command queue.
func (q *commandQueue) Flush() error {
if len(q.commands) == 0 {
@ -220,9 +225,6 @@ func (q *commandQueue) Flush() error {
}
if theGraphicsDriver.HasHighPrecisionFloat() {
const dstAdjustmentFactor = 1.0 / 256.0
const texelAdjustmentFactor = 1.0 / 512.0
n := q.nvertices / graphics.VertexFloatNum
for i := 0; i < n; i++ {
s := q.srcSizes[i]
@ -424,19 +426,29 @@ func (c *drawTrianglesCommand) Exec(indexOffset int) error {
switch v := c.uniforms[i].(type) {
case *Image:
us[i] = v.image.ID()
if !firstImage {
// Convert pixels to texels.
w, h := v.InternalSize()
i++
region := c.uniforms[i].([]float32)
us[i] = []float32{
region[0] / float32(w),
region[1] / float32(h),
region[2] / float32(w),
region[3] / float32(h),
}
if firstImage {
firstImage = false
continue
}
firstImage = false
// Convert pixels to texels.
w, h := v.InternalSize()
i++
region := c.uniforms[i].([]float32)
vs := []float32{
region[0] / float32(w),
region[1] / float32(h),
region[2] / float32(w),
region[3] / float32(h),
}
// Adjust regions not to violate neighborhoods (#317, #558, #724).
if theGraphicsDriver.HasHighPrecisionFloat() {
vs[2] -= 1.0 / float32(w) * texelAdjustmentFactor
vs[3] -= 1.0 / float32(h) * texelAdjustmentFactor
}
us[i] = vs
default:
us[i] = v
}