void VelocityBallRenderer::renderBalls(Gengine::SpriteBatch& spriteBatch, const std::vector<Ball>& balls,
const glm::mat4& projectionMatrix) {
glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
// Lazily initialize the program
if (m_program == nullptr) {
m_program = std::make_unique<Gengine::GLSLProgram>();
m_program->compileShaders("Shaders/textureShading.vert", "Shaders/textureShading.frag");
m_program->addAttribute("vertexPosition");
m_program->addAttribute("vertexColor");
m_program->addAttribute("vertexUV");
m_program->linkShaders();
}
m_program->use();
spriteBatch.begin();
// Make sure the shader uses texture 0
glActiveTexture(GL_TEXTURE0);
GLint textureUniform = m_program->getUniformLocation("mySampler");
glUniform1i(textureUniform, 0);
// Grab the camera matrix
GLint pUniform = m_program->getUniformLocation("P");
glUniformMatrix4fv(pUniform, 1, GL_FALSE, &projectionMatrix[0][0]);
// Render all the balls
for (auto& ball : balls) {
const glm::vec4 uvRect(0.0f, 0.0f, 1.0f, 1.0f);
const glm::vec4 destRect(ball.position.x - ball.radius, ball.position.y - ball.radius,
ball.radius * 2.0f, ball.radius * 2.0f);
Gengine::ColorRGBA8 color;
float mult = 100.0f;
GLubyte colorVal = (GLubyte)(glm::clamp(ball.velocity.x * mult, 0.0f, 255.0f));
color.r = 128;
color.g = (GLubyte)((ball.position.x / m_screenWidth) * 255.0f);
color.b = (GLubyte)((ball.position.y / m_screenHeight) * 255.0f);;
color.a = colorVal;
spriteBatch.draw(destRect, uvRect, ball.textureId, 0.0f, color);
}
spriteBatch.end();
spriteBatch.renderBatch();
m_program->unuse();
}
void TrippyBallRenderer::renderBalls(Gengine::SpriteBatch& spriteBatch, const std::vector<Ball>& balls, const glm::mat4& projectionMatrix) {
glClearColor(0.1f, 0.0f, 0.0f, 1.0f);
// Lazily initialize the program
if (m_program == nullptr) {
m_program = std::make_unique<Gengine::GLSLProgram>();
m_program->compileShaders("Shaders/textureShading.vert", "Shaders/textureShading.frag");
m_program->addAttribute("vertexPosition");
m_program->addAttribute("vertexColor");
m_program->addAttribute("vertexUV");
m_program->linkShaders();
}
m_program->use();
spriteBatch.begin();
// Make sure the shader uses texture 0
glActiveTexture(GL_TEXTURE0);
GLint textureUniform = m_program->getUniformLocation("mySampler");
glUniform1i(textureUniform, 0);
// Grab the camera matrix
GLint pUniform = m_program->getUniformLocation("P");
glUniformMatrix4fv(pUniform, 1, GL_FALSE, &projectionMatrix[0][0]);
// Change these constants to get cool stuff
float TIME_SPEED = 0.01f;
float DIVISOR = 4.0f; // Increase to get more arms
float SPIRAL_INTENSITY = 10.0f; // Increase to make it spiral more
m_time += TIME_SPEED;
// Render all the balls
for (auto& ball : balls) {
const glm::vec4 uvRect(0.0f, 0.0f, 1.0f, 1.0f);
const glm::vec4 destRect(ball.position.x - ball.radius, ball.position.y - ball.radius,
ball.radius * 2.0f, ball.radius * 2.0f);
Gengine::ColorRGBA8 color;
// Get vector from center point
glm::vec2 centerVec = ball.position - glm::vec2(m_screenWidth / 2, m_screenHeight / 2);
float centerDist = glm::length(centerVec);
// Get angle from the horizontal
float angle = atan2(centerVec.x, centerVec.y) / (3.1415926 / DIVISOR);
// Move with time
angle -= m_time;
// Add the spiral
angle += (centerDist / m_screenWidth) * SPIRAL_INTENSITY;
color.r = (GLubyte)(angle * 255.0f);
color.g = (GLubyte)(angle * 255.0f * cos(m_time));
color.b = (GLubyte)(angle * 255.0f * sin(m_time));
color.a = (GLubyte)(glm::clamp(1.0f - (centerDist / (m_screenWidth / 2.0f)), 0.0f, 1.0f) * 255.0f);
spriteBatch.draw(destRect, uvRect, ball.textureId, 0.0f, color);
}
spriteBatch.end();
spriteBatch.renderBatch();
m_program->unuse();
}