Example usage for org.lwjgl.opengl ARBDrawInstanced glDrawArraysInstancedARB

Introduction

In this page you can find the example usage for org.lwjgl.opengl ARBDrawInstanced glDrawArraysInstancedARB.

Prototype

public static native void glDrawArraysInstancedARB(@NativeType("GLenum") int mode,
        @NativeType("GLint") int first, @NativeType("GLsizei") int count, @NativeType("GLsizei") int primcount);

Source Link

Document

Draw multiple instances of a range of elements.

Usage

From source file:org.lwjgl.demo.opengl.instancing.GrassDemo.java

License:Open Source License

private void render() {
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    // Render ground
    glUseProgram(groundProgram);//from  w  w w. ja va2 s  .  c o m
    glUniformMatrix4fv(groundVpMatrixUniform, false, vpMatrix.get(mat4Buffer));
    ARBVertexArrayObject.glBindVertexArray(groundVao);
    glDrawArrays(GL_TRIANGLES, 0, 6);
    ARBVertexArrayObject.glBindVertexArray(0);
    // Render grass patches
    glUseProgram(grassProgram);
    glActiveTexture(GL_TEXTURE0);
    glBindTexture(GL_TEXTURE_2D, grassTex0);
    glActiveTexture(GL_TEXTURE1);
    glBindTexture(GL_TEXTURE_2D, grassTex1);
    glActiveTexture(GL_TEXTURE2);
    glBindTexture(GL_TEXTURE_2D, grassTex2);
    glActiveTexture(GL_TEXTURE3);
    glBindTexture(GL_TEXTURE_2D, grassTex3);
    glUniformMatrix4fv(grassVpMatrixUniform, false, vpMatrix.get(mat4Buffer));
    ARBVertexArrayObject.glBindVertexArray(grassVao);
    ARBDrawInstanced.glDrawArraysInstancedARB(GL_TRIANGLES, 0, 6 * NUM_FACES_PER_PATCH, NUM_GRASS_PATCHES);
    ARBVertexArrayObject.glBindVertexArray(0);
    glUseProgram(0);
    glActiveTexture(GL_TEXTURE0);
}

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