From 7228b2e1a2d0a8399facce3493d71a3569d250d5 Mon Sep 17 00:00:00 2001
From: mattkae <mattkae@protonmail.com>
Date: Fri, 23 Dec 2022 12:47:10 -0500
Subject: Improved the makefile considerably

---
 themes/src/Renderer2d.cpp | 132 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 132 insertions(+)
 create mode 100644 themes/src/Renderer2d.cpp

(limited to 'themes/src/Renderer2d.cpp')

diff --git a/themes/src/Renderer2d.cpp b/themes/src/Renderer2d.cpp
new file mode 100644
index 0000000..c303e83
--- /dev/null
+++ b/themes/src/Renderer2d.cpp
@@ -0,0 +1,132 @@
+#include "Renderer2d.h"
+#include "Shader.h"
+#include "WebglContext.h"
+#include "mathlib.h"
+#include <cstdio>
+
+// Note: In the 'transform' attribute, the transform.x is the scale,
+// transform.y is the rotation, and transform.zw is the translation.
+const char* Vertex2DShader = 
+"attribute vec2 position; \n"
+"attribute vec4 color; \n"
+"attribute mat4 vMatrix; \n"
+"uniform mat4 projection; \n"
+"uniform mat4 model; \n"
+"varying lowp vec4 VertexColor; \n"
+"void main() { \n"
+"    vec4 fragmentPosition = projection * model * vMatrix * vec4(position.x, position.y, 0, 1); \n"
+"    gl_Position = fragmentPosition; \n"
+"    VertexColor = color; \n"
+"}";
+
+const char* renderer2dFragmentShader = 
+"varying lowp vec4 VertexColor; \n"
+"void main() { \n"
+"    gl_FragColor = VertexColor; \n"
+"}";
+
+void Renderer2d::load(WebglContext* inContext) {
+	context = inContext;
+	printf("Compiling Renderer2d shader...\n");
+	shader = loadShader(Vertex2DShader, renderer2dFragmentShader);
+
+	useShader(shader);
+	attributes.position = getShaderAttribute(shader, "position");
+	attributes.color = getShaderAttribute(shader, "color");
+	attributes.vMatrix = getShaderAttribute(shader, "vMatrix");
+	uniforms.projection = getShaderUniform(shader, "projection");
+	uniforms.model = getShaderUniform(shader, "model");
+	projection = Mat4x4().getOrthographicMatrix(0, context->width, 0, context->height);
+
+	printf("Renderer2d shader compiled.\n");
+}
+	
+void Renderer2d::render() {
+	projection = Mat4x4().getOrthographicMatrix(0, context->width, 0, context->height);
+	
+	glEnable(GL_DEPTH_TEST);
+	glDepthFunc(GL_LEQUAL);
+	glDepthMask(GL_TRUE);
+	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+	glEnable(GL_BLEND);
+	glClearColor(clearColor.x, clearColor.y, clearColor.z, clearColor.w);
+	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.f, 0.f, 0.f, 0.f);
+    glClear(GL_COLOR_BUFFER_BIT);
+	glDeleteProgram(shader);
+}
+
+
+void Mesh2D::load(Vertex2D* inVertices, u32 inNumVertices, Renderer2d* renderer) {
+	ebo = 0;
+	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], GL_STATIC_DRAW);
+
+	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));
+
+	for (i32 idx = 0; idx < 4; idx++) {
+			glEnableVertexAttribArray(renderer->attributes.vMatrix + idx);
+			glVertexAttribPointer(renderer->attributes.vMatrix + idx, 4, GL_FLOAT, GL_FALSE, sizeof(Vertex2D), (GLvoid *)(offsetof(Vertex2D, vMatrix) + (idx * 16)));
+	}
+	
+	glBindBuffer(GL_ARRAY_BUFFER, 0);
+	glBindVertexArray(0);
+}
+
+
+void Mesh2D::load(Vertex2D* vertices,
+		  u32 numVertices,
+		  u32* indices,
+		  u32 inNumIndices,
+		  Renderer2d* renderer) {
+	load(vertices, numVertices, renderer);
+	glBindVertexArray(vao);
+	glGenBuffers(1, &ebo);
+	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ebo);
+    glBufferData(GL_ELEMENT_ARRAY_BUFFER, inNumIndices * sizeof(u32), &indices[0], GL_STATIC_DRAW);
+	numIndices = inNumIndices;
+	glBindVertexArray(0);
+}
+
+void Mesh2D::render(Renderer2d* renderer, GLenum drawType) {
+	setShaderMat4(renderer->uniforms.model, model);
+
+	if (ebo == 0) {
+		glBindVertexArray(vao);
+		glDrawArrays(drawType, 0, numVertices);
+		glBindVertexArray(0);
+	}
+	else {
+		glBindVertexArray(vao);
+		glDrawElements(GL_TRIANGLES, numIndices, GL_UNSIGNED_INT, 0);
+		glBindVertexArray(0);
+	}
+}
+
+void Mesh2D::unload() {
+	glDeleteVertexArrays(1, &vao);
+	glDeleteBuffers(1, &vbo);
+	if (ebo != 0) {
+		glDeleteBuffers(1, &ebo);
+		ebo = 0;
+	}
+	vao = 0;
+	vbo = 0;
+}
-- 
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