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package makamys.lodmod.renderer;
import static org.lwjgl.opengl.GL15.*;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import makamys.lodmod.renderer.Mesh.GPUStatus;
import makamys.lodmod.util.GuiHelper;
public class GPUMemoryManager {
private static int BUFFER_SIZE = 1024 * 1024 * 1024;
public int VBO;
private int nextMesh;
private List<Mesh> sentMeshes = new ArrayList<>();
public GPUMemoryManager() {
VBO = glGenBuffers();
glBindBuffer(GL_ARRAY_BUFFER, VBO);
glBufferData(GL_ARRAY_BUFFER, BUFFER_SIZE, GL_DYNAMIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);
}
public void runGC() {
glBindBuffer(GL_ARRAY_BUFFER, VBO);
int deletedNum = 0;
int deletedRAM = 0;
long t0 = System.nanoTime();
int moved = 0;
Mesh startMesh = null;
while(moved < 5 && !sentMeshes.isEmpty()) {
if(nextMesh >= sentMeshes.size()) {
nextMesh = 0;
}
Mesh mesh = sentMeshes.get(nextMesh);
if(mesh == startMesh) {
break; // we have wrapped around
} else if(startMesh == null) {
startMesh = mesh;
}
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;
nextMesh++;
} else if(mesh.gpuStatus == GPUStatus.PENDING_DELETE) {
mesh.iFirst = mesh.offset = -1;
mesh.visible = false;
mesh.gpuStatus = GPUStatus.UNSENT;
mesh.destroyBuffer();
sentMeshes.remove(nextMesh);
deletedNum++;
deletedRAM += mesh.bufferSize();
}
}
long t1 = System.nanoTime();
//System.out.println("Deleted " + deletedNum + " meshes in " + ((t1 - t0) / 1_000_000.0) + " ms, freeing up " + (deletedRAM / 1024 / 1024) + "MB of VRAM");
glBindBuffer(GL_ARRAY_BUFFER, 0);
}
private int malloc(int size) {
int nextBase = 0;
if(!sentMeshes.isEmpty()) {
nextBase = sentMeshes.get(sentMeshes.size() - 1).getEnd();
}
if(nextBase + size >= BUFFER_SIZE) {
return -1;
} else {
return nextBase;
}
}
public void sendMeshToGPU(Mesh mesh) {
if(mesh == null) {
return;
}
int nextMeshOffset = malloc(mesh.buffer.limit());
if(nextMeshOffset == -1) {
return;
}
if(mesh.gpuStatus == GPUStatus.UNSENT) {
mesh.prepareBuffer();
glBindBuffer(GL_ARRAY_BUFFER, VBO);
glBufferSubData(GL_ARRAY_BUFFER, nextMeshOffset, mesh.buffer);
mesh.iFirst = nextMeshOffset / mesh.getStride();
mesh.iCount = mesh.quadCount * 6;
mesh.offset = nextMeshOffset;
sentMeshes.add(mesh);
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() {
return Arrays.asList("VRAM: " + (malloc(0) / 1024 / 1024) + "MB / " + (BUFFER_SIZE / 1024 / 1024) + "MB");
}
public void drawInfo() {
int scale = 10000;
int rowLength = 512;
int yOff = 20;
int meshI = 0;
for(Mesh mesh : sentMeshes) {
int o = mesh.offset / 10000;
int o2 = (mesh.offset + mesh.buffer.limit()) / 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((BUFFER_SIZE / scale) % rowLength, (BUFFER_SIZE / scale) / rowLength + yOff, 4, 4, 0xFF0000);
}
}
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