From 5c613a10364f30bd6add25f7950433f0c482c3ca Mon Sep 17 00:00:00 2001
From: Matthew Kosarek <mattkae@protonmail.com>
Date: Sun, 31 Oct 2021 13:54:11 -0400
Subject: (mkosarek) Working undamped spring motion

---
 shared_cpp/Renderer2d.cpp | 87 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 87 insertions(+)
 create mode 100644 shared_cpp/Renderer2d.cpp

(limited to 'shared_cpp/Renderer2d.cpp')

diff --git a/shared_cpp/Renderer2d.cpp b/shared_cpp/Renderer2d.cpp
new file mode 100644
index 0000000..f91ed08
--- /dev/null
+++ b/shared_cpp/Renderer2d.cpp
@@ -0,0 +1,87 @@
+#include "Renderer2d.h"
+#include "WebglContext.h"
+#include "mathlib.h"
+
+const char* orthographicVertex = 
+"attribute vec2 position; \n"
+"attribute vec4 color; \n"
+"uniform mat4 projection; \n"
+"uniform mat4 model; \n"
+"varying lowp vec4 VertexColor; \n"
+"void main() { \n"
+"    vec4 fragmentPosition = projection * model * vec4(position, 1, 1); \n"
+"    gl_Position = fragmentPosition; \n"
+"    VertexColor = color; \n"
+"}";
+
+const char* orthographicFragment = 
+"varying lowp vec4 VertexColor; \n"
+"void main() { \n"
+"    gl_FragColor = VertexColor; \n"
+"}";
+
+void Renderer2d::load(WebglContext* context) {
+	printf("Compiling orthographic shader...\n");
+	shader = loadShader(orthographicVertex, orthographicFragment);
+
+	useShader(shader);
+	attributes.position = getShaderAttribute(shader, "position");
+	attributes.color = getShaderAttribute(shader, "color");
+	uniforms.projection = getShaderUniform(shader, "projection");
+	uniforms.model = getShaderUniform(shader, "model");
+	projection = Mat4x4().getOrthographicMatrix(0, context->width, 0, context->height);
+
+	printf("Orthographic shader compiled.\n");
+}
+	
+void Renderer2d::render() {
+	glEnable(GL_DEPTH_TEST);
+	glDepthFunc(GL_LEQUAL);
+	glDepthMask(GL_TRUE);
+	glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
+	glClearDepth(1.0f);
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
+	useShader(shader);
+	setShaderMat4(uniforms.projection, projection);
+}
+
+void Renderer2d::unload() {
+	glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
+    glClear(GL_COLOR_BUFFER_BIT);
+	glDeleteProgram(shader);
+}
+
+
+void Mesh2d::load(Vertex2d* inVertices, uint32 inNumVertices, Renderer2d* renderer, GLenum loadType) {
+	numVertices = inNumVertices;
+	useShader(renderer->shader);
+
+	glGenVertexArrays(1, &vao);
+	glBindVertexArray(vao);
+
+	glGenBuffers(1, &vbo);
+	glBindBuffer(GL_ARRAY_BUFFER, vbo);
+	glBufferData(GL_ARRAY_BUFFER, inNumVertices * sizeof(Vertex2d), &inVertices[0], loadType);
+
+	glEnableVertexAttribArray(renderer->attributes.position);
+	glVertexAttribPointer(renderer->attributes.position, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex2d), (GLvoid *)0);
+
+	glEnableVertexAttribArray(renderer->attributes.color);
+	glVertexAttribPointer(renderer->attributes.color, 4, GL_FLOAT, GL_FALSE, sizeof(Vertex2d), (GLvoid *)offsetof(Vertex2d, color));
+
+	glBindBuffer(GL_ARRAY_BUFFER, 0);
+	glBindVertexArray(0);
+}
+
+void Mesh2d::render(Renderer2d* renderer, GLenum drawType) {
+	setShaderMat4(renderer->uniforms.model, model);
+
+	glBindVertexArray(vao);
+	glDrawArrays(drawType, 0, numVertices);
+	glBindVertexArray(0);
+}
+
+void Mesh2d::unload() {
+	glDeleteVertexArrays(1, &vao);
+	glDeleteBuffers(1, &vbo);
+}
-- 
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