From 481e582be02385271f87524bfe46d6c41654e23c Mon Sep 17 00:00:00 2001
From: Sebastian Park <SebPark03@gmail.com>
Date: Thu, 9 May 2024 22:02:12 -0400
Subject: "raytraced" caustics.

---
 src/glwidget.cpp | 61 ++++++++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 57 insertions(+), 4 deletions(-)

(limited to 'src/glwidget.cpp')

diff --git a/src/glwidget.cpp b/src/glwidget.cpp
index bac695c..62d8482 100755
--- a/src/glwidget.cpp
+++ b/src/glwidget.cpp
@@ -67,7 +67,7 @@ void GLWidget::initializeGL()
     glClearColor(1, 0.98f, 0.85f, 1);
 
     // Enable depth-testing and backface culling
-    glEnable(GL_DEPTH_TEST);
+//    glEnable(GL_DEPTH_TEST);
 //    glEnable(GL_CULL_FACE);
 //    glCullFace(GL_BACK);
 //    glShadeModel(GL_SMOOTH);
@@ -78,7 +78,7 @@ void GLWidget::initializeGL()
     m_pointShader   = new Shader(":resources/shaders/anchorPoint.vert", ":resources/shaders/anchorPoint.geom", ":resources/shaders/anchorPoint.frag");
 //    m_texture_shader = new Shader(":/resources/shaders/texture.vert", ":/resources/shaders/texture.frag");
     m_colorShader   = new Shader(":resources/shaders/color.vert",      ":resources/shaders/color.frag");
-
+    m_causticsShader = new Shader(":resources/shaders/caustics.vert",      ":resources/shaders/caustics.frag");
 
     initCaustics();
     // INITIALIZE TEXTURE STUFF
@@ -103,11 +103,12 @@ void GLWidget::initializeGL()
 
     m_devicePixelRatio = this->devicePixelRatio();
 
-    m_defaultFBO = 2;
+    m_defaultFBO = 3;
     m_fbo_width = size().width() * m_devicePixelRatio;
     m_fbo_height = size().height() * m_devicePixelRatio;
 
     makeFBO();
+    makeFBO1();
 
     // FBO STUFF END
 
@@ -171,7 +172,7 @@ void GLWidget::paintCaustics() {
     glClearColor(0.68f, 0.58f, 0.38f, 1);
 //    glClearColor(0., 0., 0., 1);
 
-    glBindFramebuffer(GL_FRAMEBUFFER, m_fbo);
+    glBindFramebuffer(GL_FRAMEBUFFER, m_fbo1);
 //    glBindFramebuffer(GL_FRAMEBUFFER, m_defaultFBO);
 
     // Clear Screen
@@ -189,6 +190,7 @@ void GLWidget::paintCaustics() {
 ////    // Draw the VAO
 //    glDrawArrays(GL_TRIANGLES, 0, 3);
 
+
     m_colorShader->bind();
     //
     m_colorShader->setUniform("proj", m_camera.getProjection());
@@ -205,6 +207,23 @@ void GLWidget::paintCaustics() {
 
     // Unbind the shader
     glUseProgram(0);
+
+    m_causticsShader->bind();
+
+//    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+    glBindFramebuffer(GL_FRAMEBUFFER, m_fbo_texture);
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+    glEnable( GL_BLEND );
+
+    glActiveTexture(GL_TEXTURE2);
+    glBindTexture(GL_TEXTURE_2D, m_fbo_texture1);
+    glUniform1i(glGetUniformLocation(m_causticsShader ->id(), "normSamp"), 2);
+
+    m_arap.m_causticsShape.draw(m_causticsShader, GL_TRIANGLES);
+    glBindVertexArray(0);
+    glUseProgram(0);
 }
 
 void GLWidget::initCaustics() {
@@ -307,7 +326,37 @@ void GLWidget::makeFBO() {
 
     // Task 22
     glBindFramebuffer(GL_FRAMEBUFFER, m_defaultFBO);
+}
 
+void GLWidget::makeFBO1() {
+    // Task 19
+    glActiveTexture(GL_TEXTURE2);
+    glGenTextures(1, &m_fbo_texture1);
+    glBindTexture(GL_TEXTURE_2D, m_fbo_texture1);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, m_fbo_width, m_fbo_height, 0, GL_RGB, GL_UNSIGNED_BYTE, NULL);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+    glBindTexture(GL_TEXTURE_2D, 0);
+
+    // Task 20
+    glGenRenderbuffers(1, &m_fbo_renderbuffer1);
+    glBindRenderbuffer(GL_RENDERBUFFER, m_fbo_renderbuffer1);
+    glRenderbufferStorage(GL_RENDERBUFFER,
+                          GL_DEPTH24_STENCIL8,
+                          m_fbo_width,
+                          m_fbo_height);
+    glBindRenderbuffer(GL_RENDERBUFFER, 0);
+
+    // Task 18
+    glGenFramebuffers(1, &m_fbo1);
+    glBindFramebuffer(GL_FRAMEBUFFER, m_fbo1);
+
+    // Task 21
+    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, m_fbo_texture1, 0);
+    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_RENDERBUFFER, m_fbo_renderbuffer1);
+
+    // Task 22
+    glBindFramebuffer(GL_FRAMEBUFFER, m_defaultFBO);
 }
 
 void GLWidget::paintGL()
@@ -356,7 +405,11 @@ void GLWidget::resizeGL(int w, int h)
     glDeleteTextures(1, &m_fbo_texture);
     glDeleteRenderbuffers(1, &m_fbo_renderbuffer);
     glDeleteFramebuffers(1, &m_fbo);
+    glDeleteTextures(1, &m_fbo_texture1);
+    glDeleteRenderbuffers(1, &m_fbo_renderbuffer1);
+    glDeleteFramebuffers(1, &m_fbo1);
     makeFBO();
+    makeFBO1();
 }
 
 // ================== Event Listeners
-- 
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