4jcraft/Minecraft.Client/Rendering/EntityRenderers/PaintingRenderer.cpp

#include "../../Platform/stdafx.h"
#include "PaintingRenderer.h"
#include "EntityRenderDispatcher.h"
#include "../../../Minecraft.World/Headers/net.minecraft.world.entity.h"
#include "../../../Minecraft.World/Headers/net.minecraft.world.level.h"
#include "../../../Minecraft.World/Util/Random.h"
#include "../../../Minecraft.World/Util/Mth.h"

PaintingRenderer::PaintingRenderer() { random = new Random(); }

void PaintingRenderer::render(std::shared_ptr<Entity> _painting, double x,
                              double y, double z, float rot, float a) {
    // 4J - dynamic cast required because we aren't using templates/generics in
    // our version
    std::shared_ptr<Painting> painting =
        std::dynamic_pointer_cast<Painting>(_painting);

    random->setSeed(187);

    glPushMatrix();
    glTranslatef((float)x, (float)y, (float)z);
    glRotatef(rot, 0, 1, 0);
    glEnable(GL_RESCALE_NORMAL);
    bindTexture(TN_ART_KZ);  // 4J was L"/art/kz.png"

    Painting::Motive* motive = painting->motive;

    float s = 1 / 16.0f;
    glScalef(s, s, s);
    renderPainting(painting, motive->w, motive->h, motive->uo, motive->vo);
    glDisable(GL_RESCALE_NORMAL);
    glPopMatrix();
}

void PaintingRenderer::renderPainting(std::shared_ptr<Painting> painting, int w,
                                      int h, int uo, int vo) {
    float xx0 = -w / 2.0f;
    float yy0 = -h / 2.0f;

    float z0 = -0.5f;
    float z1 = +0.5f;

    for (int xs = 0; xs < w / 16; xs++)
        for (int ys = 0; ys < h / 16; ys++) {
            float x0 = xx0 + (xs + 1) * 16;
            float x1 = xx0 + (xs) * 16;
            float y0 = yy0 + (ys + 1) * 16;
            float y1 = yy0 + (ys) * 16;

            setBrightness(painting, (x0 + x1) / 2, (y0 + y1) / 2);

            float fu0 = (uo + w - (xs) * 16) / 256.0f;
            float fu1 = (uo + w - (xs + 1) * 16) / 256.0f;
            float fv0 = (vo + h - (ys) * 16) / 256.0f;
            float fv1 = (vo + h - (ys + 1) * 16) / 256.0f;

            float bu0 = (12 * 16) / 256.0f;
            float bu1 = (12 * 16 + 16) / 256.0f;
            float bv0 = (0) / 256.0f;
            float bv1 = (0 + 16) / 256.0f;

            float uu0 = (12 * 16) / 256.0f;
            float uu1 = (12 * 16 + 16) / 256.0f;
            float uv0 = (0.5f) / 256.0f;
            float uv1 = (0.5f) / 256.0f;

            float su0 = (12 * 16 + 0.5f) / 256.0f;
            float su1 = (12 * 16 + 0.5f) / 256.0f;
            float sv0 = (0) / 256.0f;
            float sv1 = (0 + 16) / 256.0f;

            Tesselator* t = Tesselator::getInstance();
            t->begin();
            t->normal(0, 0, -1);
            t->vertexUV((float)(x0), (float)(y1), (float)(z0), (float)(fu1),
                        (float)(fv0));
            t->vertexUV((float)(x1), (float)(y1), (float)(z0), (float)(fu0),
                        (float)(fv0));
            t->vertexUV((float)(x1), (float)(y0), (float)(z0), (float)(fu0),
                        (float)(fv1));
            t->vertexUV((float)(x0), (float)(y0), (float)(z0), (float)(fu1),
                        (float)(fv1));

            t->normal(0, 0, 1);
            t->vertexUV((float)(x0), (float)(y0), (float)(z1), (float)(bu0),
                        (float)(bv0));
            t->vertexUV((float)(x1), (float)(y0), (float)(z1), (float)(bu1),
                        (float)(bv0));
            t->vertexUV((float)(x1), (float)(y1), (float)(z1), (float)(bu1),
                        (float)(bv1));
            t->vertexUV((float)(x0), (float)(y1), (float)(z1), (float)(bu0),
                        (float)(bv1));

            t->normal(0, 1, 0);
            t->vertexUV((float)(x0), (float)(y0), (float)(z0), (float)(uu0),
                        (float)(uv0));
            t->vertexUV((float)(x1), (float)(y0), (float)(z0), (float)(uu1),
                        (float)(uv0));
            t->vertexUV((float)(x1), (float)(y0), (float)(z1), (float)(uu1),
                        (float)(uv1));
            t->vertexUV((float)(x0), (float)(y0), (float)(z1), (float)(uu0),
                        (float)(uv1));

            t->normal(0, -1, 0);
            t->vertexUV((float)(x0), (float)(y1), (float)(z1), (float)(uu0),
                        (float)(uv0));
            t->vertexUV((float)(x1), (float)(y1), (float)(z1), (float)(uu1),
                        (float)(uv0));
            t->vertexUV((float)(x1), (float)(y1), (float)(z0), (float)(uu1),
                        (float)(uv1));
            t->vertexUV((float)(x0), (float)(y1), (float)(z0), (float)(uu0),
                        (float)(uv1));

            t->normal(-1, 0, 0);
            t->vertexUV((float)(x0), (float)(y0), (float)(z1), (float)(su1),
                        (float)(sv0));
            t->vertexUV((float)(x0), (float)(y1), (float)(z1), (float)(su1),
                        (float)(sv1));
            t->vertexUV((float)(x0), (float)(y1), (float)(z0), (float)(su0),
                        (float)(sv1));
            t->vertexUV((float)(x0), (float)(y0), (float)(z0), (float)(su0),
                        (float)(sv0));

            t->normal(1, 0, 0);
            t->vertexUV((float)(x1), (float)(y0), (float)(z0), (float)(su1),
                        (float)(sv0));
            t->vertexUV((float)(x1), (float)(y1), (float)(z0), (float)(su1),
                        (float)(sv1));
            t->vertexUV((float)(x1), (float)(y1), (float)(z1), (float)(su0),
                        (float)(sv1));
            t->vertexUV((float)(x1), (float)(y0), (float)(z1), (float)(su0),
                        (float)(sv0));
            t->end();
        }
}

void PaintingRenderer::setBrightness(std::shared_ptr<Painting> painting,
                                     float ss, float ya) {
    int x = Mth::floor(painting->x);
    int y = Mth::floor(painting->y + ya / 16.0f);
    int z = Mth::floor(painting->z);
    if (painting->dir == 0) x = Mth::floor(painting->x + ss / 16.0f);
    if (painting->dir == 1) z = Mth::floor(painting->z - ss / 16.0f);
    if (painting->dir == 2) x = Mth::floor(painting->x - ss / 16.0f);
    if (painting->dir == 3) z = Mth::floor(painting->z + ss / 16.0f);

    int col = this->entityRenderDispatcher->level->getLightColor(x, y, z, 0);
    int u = col % 65536;
    int v = col / 65536;
    glMultiTexCoord2f(0, u, v);
    glColor3f(1, 1, 1);
}