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package moe.nea.firmament.util.render
import com.mojang.blaze3d.buffers.GpuBuffer
import com.mojang.blaze3d.systems.RenderSystem
import com.mojang.blaze3d.textures.GpuTexture
import java.io.File
import net.minecraft.client.texture.NativeImage
fun dumpTexture(gpuTexture: GpuTexture, name: String) {
val w = gpuTexture.getWidth(0)
val h = gpuTexture.getHeight(0)
val buffer = RenderSystem.getDevice()
.createBuffer(
{ "Dump Buffer" },
GpuBuffer.USAGE_COPY_DST or GpuBuffer.USAGE_MAP_READ,
w * h * gpuTexture.getFormat().pixelSize()
)
val commandEncoder = RenderSystem.getDevice().createCommandEncoder()
commandEncoder.copyTextureToBuffer(
gpuTexture, buffer, 0, {
val nativeImage = NativeImage(w, h, false)
commandEncoder.mapBuffer(buffer, true, false).use { mappedView ->
for (i in 0..<w) {
for (j in 0..<h) {
val color = mappedView.data().getInt((j + i * w) * gpuTexture.format.pixelSize())
nativeImage.setColor(j, h - i - 1, color)
}
}
}
buffer.close()
nativeImage.writeTo(File("$name.png"))
}, 0
)
}
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