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- package me.hammerle.snuviengine.api;
- import java.nio.ByteBuffer;
- import static org.lwjgl.opengl.GL11.*;
- import static org.lwjgl.opengl.GL15.*;
- import static org.lwjgl.opengl.GL20.*;
- import static org.lwjgl.opengl.GL30.*;
- public final class ColorRenderer {
- private final static int BUFFER_BYTE_LENGTH = 1024 * 1024; // 1 MiB
- private final static int OBJECT_LENGTH = 64; // 16 Floats
- private final int vertexArray;
- private final int vertexBuffer;
- private ByteBuffer buffer;
- private int offset = BUFFER_BYTE_LENGTH;
- private float depth = 0.0f;
- protected ColorRenderer() {
- vertexArray = glGenVertexArrays();
- vertexBuffer = glGenBuffers();
- GLHelper.glBindVertexArray(vertexArray);
- GLHelper.glBindBuffer(vertexBuffer);
- glEnableVertexAttribArray(0);
- glEnableVertexAttribArray(2);
- glVertexAttribPointer(0, 3, GL_FLOAT, false, 16, 0);
- glVertexAttribPointer(2, 4, GL_UNSIGNED_BYTE, true, 16, 12);
- }
- public void setDepth(float depth) {
- this.depth = depth;
- }
- public void drawRectangle(float minX, float minY, float maxX, float maxY, int color) {
- buffer = getNextBuffer();
- if(buffer == null) {
- return;
- }
- addToBuffer(minX, maxY, color);
- addToBuffer(minX, minY, color);
- addToBuffer(maxX, maxY, color);
- addToBuffer(maxX, minY, color);
- finishBuffer();
- drawBuffer();
- }
- private ByteBuffer getNextBuffer() {
- GLHelper.glBindBuffer(vertexBuffer);
- offset += OBJECT_LENGTH;
- if(offset + OBJECT_LENGTH >= BUFFER_BYTE_LENGTH) {
- offset = 0;
- glBufferData(GL_ARRAY_BUFFER, BUFFER_BYTE_LENGTH, GL_STREAM_DRAW);
- }
- return glMapBufferRange(GL_ARRAY_BUFFER, offset, OBJECT_LENGTH, GL_MAP_WRITE_BIT | GL_MAP_UNSYNCHRONIZED_BIT, buffer);
- }
- private void addToBuffer(float x, float y, int color) {
- buffer.putFloat(x);
- buffer.putFloat(y);
- buffer.putFloat(depth);
- buffer.putInt(color);
- }
- private void finishBuffer() {
- buffer.flip();
- glUnmapBuffer(GL_ARRAY_BUFFER);
- }
- private void drawBuffer() {
- GLHelper.glBindVertexArray(vertexArray);
- glDrawArrays(GL_TRIANGLE_STRIP, offset / 16, 4);
- }
- }
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