shapes.cc

#include <memory>
#include <cstdio>
#include <iostream>

#include <ux/shapes.h>

ColorQuad::ColorQuad() {
    vertexArray = new VertexArray((const GLfloat *)quadVertices, sizeof(quadVertices));
}

void ColorQuad::bindData(ColorShaderProgram *shaderProgram) {
    vertexArray->bindBuffer();

    vertexArray->setVertexAttribPointer(
            0,
            shaderProgram->getPositionAttributeLocation(),
            4,
            0);
}

void ColorQuad::draw() {
    glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
    
    for (GLenum err = glGetError(); err != GL_NO_ERROR; err = glGetError()) {
        fprintf(stderr, "%d: %s\n", err, gluErrorString(err));
    }

    vertexArray->unbindBuffer();
    glUseProgram(0);
}

TextureQuad::TextureQuad() {
    vertexArray = new VertexArray((const GLfloat *)textureQuadVertices, sizeof(textureQuadVertices));
}

void TextureQuad::bindData(TextureShaderProgram *shaderProgram) {
    vertexArray->bindBuffer();

    int positionComponentCount = 2;
    int textureComponentCount = 2;
    int stride = (positionComponentCount + textureComponentCount) * 4;


    vertexArray->setVertexAttribPointer(
            0,
            shaderProgram->getPositionAttributeLocation(),
            2,
            stride);
    
    // vertexArray->setVertexAttribPointer(
    //         0,
    //         shaderProgram->getTextureCoordinatesAttributeLocation(),
    //         2,
    //         stride);

    vertexArray->setVertexAttribPointer(
            (void *)8, //positionComponentCount
            shaderProgram->getTextureCoordinatesAttributeLocation(),
            textureComponentCount,
            stride);
}

void TextureQuad::draw() {
    glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
    
    for (GLenum err = glGetError(); err != GL_NO_ERROR; err = glGetError()) {
        fprintf(stderr, "%d: %s\n", err, gluErrorString(err));
    }

    vertexArray->unbindBuffer();
    glUseProgram(0);
}