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package makamys.neodymium.renderer;
import static org.lwjgl.opengl.GL15.*;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import makamys.neodymium.Config;
import makamys.neodymium.Neodymium;
import makamys.neodymium.renderer.Mesh.GPUStatus;
import makamys.neodymium.util.GuiHelper;
import makamys.neodymium.util.MCUtil;
import net.minecraft.util.EnumChatFormatting;
/** Manages dynamic memory allocation inside a fixed buffer on the GPU. */
public class GPUMemoryManager {
private int bufferSize;
public int VBO;
private int nextMesh;
private List<Mesh> sentMeshes = new ArrayList<>();
private int usedVRAM;
private long lastUsedVRAMUpdate;
private static final long USED_VRAM_UPDATE_RATE = 1_000_000_000;
public GPUMemoryManager() {
VBO = glGenBuffers();
bufferSize = Config.VRAMSize * 1024 * 1024;
glBindBuffer(GL_ARRAY_BUFFER, VBO);
glBufferData(GL_ARRAY_BUFFER, bufferSize, GL_DYNAMIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);
}
public void runGC(boolean full) {
glBindBuffer(GL_ARRAY_BUFFER, VBO);
int moved = 0;
int timesReachedEnd = 0;
int checksLeft = sentMeshes.size();
final int MB256 = 256 * 1024 * 1024;
int panicRate = (int)(((float)Math.max(MB256 - (bufferSize - end()), 0) / (float)MB256) * 64f);
while((!full && (moved < (4 + panicRate) && checksLeft-- > 0)) || (full && timesReachedEnd < 2) && !sentMeshes.isEmpty()) {
nextMesh++;
if(nextMesh >= sentMeshes.size()) {
nextMesh = 0;
timesReachedEnd++;
}
Mesh mesh = sentMeshes.get(nextMesh);
if(mesh.gpuStatus == GPUStatus.SENT) {
int offset = nextMesh == 0 ? 0 : sentMeshes.get(nextMesh - 1).getEnd();
if(mesh.offset != offset) {
glBufferSubData(GL_ARRAY_BUFFER, offset, mesh.buffer);
moved++;
}
mesh.iFirst = offset / mesh.getStride();
mesh.offset = offset;
} else if(mesh.gpuStatus == GPUStatus.PENDING_DELETE) {
mesh.iFirst = mesh.offset = -1;
mesh.visible = false;
mesh.gpuStatus = GPUStatus.UNSENT;
sentMeshes.remove(nextMesh);
mesh.destroyBuffer();
if(nextMesh > 0) {
nextMesh--;
}
}
}
glBindBuffer(GL_ARRAY_BUFFER, 0);
}
private int malloc(int size) {
int nextBase = 0;
if(!sentMeshes.isEmpty()) {
if(nextMesh < sentMeshes.size() - 1) {
Mesh next = sentMeshes.get(nextMesh);
Mesh nextnext = sentMeshes.get(nextMesh + 1);
if(nextnext.offset - next.getEnd() >= size) {
return next.getEnd();
}
}
nextBase = sentMeshes.get(sentMeshes.size() - 1).getEnd();
}
if(nextBase + size >= bufferSize) {
return -1;
} else {
return nextBase;
}
}
private int end() {
return (sentMeshes.isEmpty() ? 0 : sentMeshes.get(sentMeshes.size() - 1).getEnd());
}
public void sendMeshToGPU(Mesh mesh) {
if(mesh == null || mesh.buffer == null) {
return;
}
if(end() + mesh.bufferSize() >= bufferSize) {
runGC(true);
}
if(end() + mesh.bufferSize() >= bufferSize) {
MCUtil.showChatMessage("" + "[" + EnumChatFormatting.LIGHT_PURPLE + Neodymium.MODID + EnumChatFormatting.RESET + "/" + EnumChatFormatting.RED + "ERROR" + EnumChatFormatting.RESET + "] VRAM is full! Reverting to vanilla renderer. Try increasing the VRAM buffer size in the config, if possible.");
Neodymium.renderer.destroyPending = true;
// TODO restart renderer with more VRAM allocated when this happens.
return;
}
int size = mesh.bufferSize();
int insertIndex = -1;
int nextBase = -1;
if(!sentMeshes.isEmpty()) {
if(nextMesh < sentMeshes.size() - 1) {
Mesh next = sentMeshes.get(nextMesh);
Mesh nextnext = null;
for(int i = nextMesh + 1; i < sentMeshes.size(); i++) {
Mesh m = sentMeshes.get(i);
if(m.gpuStatus == Mesh.GPUStatus.SENT) {
nextnext = m;
break;
}
}
if(nextnext != null && nextnext.offset - next.getEnd() >= size) {
nextBase = next.getEnd();
insertIndex = nextMesh + 1;
}
}
if(nextBase == -1) {
nextBase = sentMeshes.get(sentMeshes.size() - 1).getEnd();
}
}
if(nextBase == -1) nextBase = 0;
if(mesh.gpuStatus == GPUStatus.UNSENT) {
mesh.prepareBuffer();
glBindBuffer(GL_ARRAY_BUFFER, VBO);
glBufferSubData(GL_ARRAY_BUFFER, nextBase, mesh.buffer);
mesh.iFirst = nextBase / mesh.getStride();
mesh.iCount = mesh.quadCount * 4;
mesh.offset = nextBase;
if(insertIndex == -1) {
sentMeshes.add(mesh);
} else {
sentMeshes.add(insertIndex, mesh);
nextMesh = insertIndex;
}
glBindBuffer(GL_ARRAY_BUFFER, 0);
}
mesh.gpuStatus = GPUStatus.SENT;
}
public void deleteMeshFromGPU(Mesh mesh) {
if(mesh == null || mesh.gpuStatus == GPUStatus.UNSENT) {
return;
}
mesh.gpuStatus = GPUStatus.PENDING_DELETE;
}
public void destroy() {
glDeleteBuffers(VBO);
}
public List<String> getDebugText() {
long t = System.nanoTime();
if(t - lastUsedVRAMUpdate > USED_VRAM_UPDATE_RATE) {
usedVRAM = 0;
for(Mesh mesh : sentMeshes) {
usedVRAM += mesh.bufferSize();
}
lastUsedVRAMUpdate = t;
}
return Arrays.asList("VRAM: " + (usedVRAM / 1024 / 1024) + "MB (" + (end() / 1024 / 1024) + "MB) / " + (bufferSize / 1024 / 1024) + "MB");
}
public void drawInfo() {
int scale = 10000;
int rowLength = 512;
int yOff = 20;
int height = (bufferSize / scale) / rowLength;
GuiHelper.drawRectangle(0, yOff, rowLength, height, 0x000000, 50);
int meshI = 0;
for(Mesh mesh : sentMeshes) {
int o = mesh.offset / 10000;
int o2 = (mesh.offset + mesh.bufferSize()) / 10000;
if(o / rowLength == o2 / rowLength) {
if(mesh.gpuStatus != Mesh.GPUStatus.PENDING_DELETE) {
GuiHelper.drawRectangle(o % rowLength, o / rowLength + yOff, mesh.buffer.limit() / scale + 1, 1, meshI == nextMesh ? 0x00FF00 : 0xFFFFFF);
}
} else {
for(int i = o; i < o2; i++) {
int x = i % rowLength;
int y = i / rowLength;
if(mesh.gpuStatus != Mesh.GPUStatus.PENDING_DELETE) {
GuiHelper.drawRectangle(x, y + yOff, 1, 1, 0xFFFFFF);
}
}
}
meshI++;
}
GuiHelper.drawRectangle(0 % rowLength, 0 + yOff, 4, 4, 0x00FF00);
GuiHelper.drawRectangle((bufferSize / scale) % rowLength, (bufferSize / scale) / rowLength + yOff, 4, 4, 0xFF0000);
}
public float getCoherenceRate() {
return (float)ChunkMesh.usedRAM / (float)end();
}
}
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