From cc05fdc7396532b329f30decde5583853da92a44 Mon Sep 17 00:00:00 2001
From: Matthew Kosarek <mattkae@protonmail.com>
Date: Sat, 27 Mar 2021 20:54:27 -0400
Subject: Drawing an ellipse

---
 frontend/shared_cpp/OrthographicRenderer.cpp | 47 +++++++++++++++++++++++++++-
 1 file changed, 46 insertions(+), 1 deletion(-)

(limited to 'frontend/shared_cpp/OrthographicRenderer.cpp')

diff --git a/frontend/shared_cpp/OrthographicRenderer.cpp b/frontend/shared_cpp/OrthographicRenderer.cpp
index b6bd5b6..1d62c04 100644
--- a/frontend/shared_cpp/OrthographicRenderer.cpp
+++ b/frontend/shared_cpp/OrthographicRenderer.cpp
@@ -1,4 +1,6 @@
 #include "OrthographicRenderer.h"
+#include "WebglContext.h"
+#include "mathlib.h"
 
 const char* orthographicVertex = 
 "attribute vec2 position; \n"
@@ -18,7 +20,7 @@ const char* orthographicFragment =
 "    gl_FragColor = VertexColor; \n"
 "}";
 
-void OrthographicRenderer::load() {
+void OrthographicRenderer::load(WebglContext* context) {
 	printf("Compiling orthographic shader...\n");
 	shader = loadShader(orthographicVertex, orthographicFragment);
 
@@ -27,6 +29,7 @@ void OrthographicRenderer::load() {
 	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");
 }
@@ -47,3 +50,45 @@ void OrthographicRenderer::unload() {
     glClear(GL_COLOR_BUFFER_BIT);
 	glDeleteProgram(shader);
 }
+
+
+void OrthographicShape::load(OrthographicVertex* inVertices, uint32 inNumVertices, OrthographicRenderer* renderer) {
+	vertices = inVertices;
+	numVertices = inNumVertices;
+	useShader(renderer->shader);
+
+	glGenVertexArrays(1, &vao);
+	glBindVertexArray(vao);
+
+	glGenBuffers(1, &vbo);
+	glBindBuffer(GL_ARRAY_BUFFER, vbo);
+	glBufferData(GL_ARRAY_BUFFER, inNumVertices * sizeof(OrthographicVertex), &vertices[0], GL_STATIC_DRAW);
+
+	glEnableVertexAttribArray(renderer->attributes.position);
+	glVertexAttribPointer(renderer->attributes.position, 2, GL_FLOAT, GL_FALSE, sizeof(OrthographicVertex), (GLvoid *)0);
+
+	glEnableVertexAttribArray(renderer->attributes.color);
+	glVertexAttribPointer(renderer->attributes.color, 4, GL_FLOAT, GL_FALSE, sizeof(OrthographicVertex), (GLvoid *)offsetof(OrthographicVertex, color));
+
+	glBindBuffer(GL_ARRAY_BUFFER, 0);
+	glBindVertexArray(0);
+}
+
+void OrthographicShape::render(OrthographicRenderer* renderer) {
+	setShaderMat4(renderer->uniforms.model, model);
+
+	glBindVertexArray(vao);
+	glDrawArrays(GL_TRIANGLES, 0, numVertices);
+	glBindVertexArray(0);
+}
+
+void OrthographicShape::unload() {
+	glDeleteVertexArrays(1, &vao);
+	glDeleteBuffers(1, &vbo);
+
+	if (vertices != NULL) {
+		delete vertices;
+	}
+
+	vertices = NULL;
+}
\ No newline at end of file
-- 
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