87 lines
3.1 KiB
Java
87 lines
3.1 KiB
Java
package com.github.hydos.ginger.engine.opengl.shadow;
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import java.util.*;
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import org.joml.Matrix4f;
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import org.lwjgl.opengl.*;
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import com.github.hydos.ginger.engine.common.elements.objects.GLRenderObject;
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import com.github.hydos.ginger.engine.common.math.Maths;
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import com.github.hydos.ginger.engine.opengl.render.GLRenderManager;
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import com.github.hydos.ginger.engine.opengl.render.models.*;
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public class ShadowMapEntityRenderer
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{
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private Matrix4f projectionViewMatrix;
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private ShadowShader shader;
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/** @param shader
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* - the simple shader program being used for the shadow render
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* pass.
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* @param projectionViewMatrix
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* - the orthographic projection matrix multiplied by the light's
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* "view" matrix. */
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protected ShadowMapEntityRenderer(ShadowShader shader, Matrix4f projectionViewMatrix)
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{
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this.shader = shader;
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this.projectionViewMatrix = projectionViewMatrix;
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}
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/** Binds a raw model before rendering. Only the attribute 0 is enabled here
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* because that is where the positions are stored in the VAO, and only the
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* positions are required in the vertex shader.
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*
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* @param rawModel
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* - the model to be bound. */
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private void bindModel(RawModel rawModel)
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{
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GL30.glBindVertexArray(rawModel.getVaoID());
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GL20.glEnableVertexAttribArray(0);
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GL20.glEnableVertexAttribArray(1);
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}
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/** Prepares an entity to be rendered. The model matrix is created in the
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* usual way and then multiplied with the projection and view matrix (often
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* in the past we've done this in the vertex shader) to create the
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* mvp-matrix. This is then loaded to the vertex shader as a uniform.
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*
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* @param entity
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* - the entity to be prepared for rendering. */
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private void prepareInstance(GLRenderObject entity)
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{
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Matrix4f modelMatrix = Maths.createTransformationMatrix(entity.getPosition(),
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entity.getRotX(), entity.getRotY(), entity.getRotZ(), entity.getScale());
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Matrix4f mvpMatrix = projectionViewMatrix.mul(modelMatrix);
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shader.loadMvpMatrix(mvpMatrix);
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}
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/** Renders entieis to the shadow map. Each model is first bound and then all
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* of the entities using that model are rendered to the shadow map.
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*
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* @param entities
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* - the entities to be rendered to the shadow map. */
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protected void render(Map<GLTexturedModel, List<GLRenderObject>> entities)
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{
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for (GLTexturedModel model : entities.keySet())
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{
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RawModel rawModel = model.getRawModel();
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bindModel(rawModel);
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GL13.glActiveTexture(GL13.GL_TEXTURE0);
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GL11.glBindTexture(GL11.GL_TEXTURE_2D, model.getTexture().getTextureID());
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if (model.getTexture().isTransparent())
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{ GLRenderManager.disableCulling(); }
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for (GLRenderObject entity : entities.get(model))
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{
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prepareInstance(entity);
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GL11.glDrawElements(GL11.GL_TRIANGLES, rawModel.getVertexCount(),
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GL11.GL_UNSIGNED_INT, 0);
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}
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if (model.getTexture().isTransparent())
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{ GLRenderManager.enableCulling(); }
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}
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GL20.glDisableVertexAttribArray(0);
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GL20.glDisableVertexAttribArray(1);
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GL30.glBindVertexArray(0);
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}
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}
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