From 40a924db3664318615a9a3f11ee25c206cb77fe1 Mon Sep 17 00:00:00 2001
From: mattkae <mattkae@protonmail.com>
Date: Sun, 1 May 2022 21:44:04 -0400
Subject: Renderer3d basics

---
 themes/Renderer3d.cpp | 73 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 73 insertions(+)
 create mode 100644 themes/Renderer3d.cpp

(limited to 'themes/Renderer3d.cpp')

diff --git a/themes/Renderer3d.cpp b/themes/Renderer3d.cpp
new file mode 100644
index 0000000..0106f10
--- /dev/null
+++ b/themes/Renderer3d.cpp
@@ -0,0 +1,73 @@
+#include "Renderer3d.h"
+#include "Shader.h"
+#include "mathlib.h"
+#include "WebglContext.h"
+#include "Logger.h"
+
+// Note: In the 'transform' attribute, the transform.x is the scale,
+// transform.y is the rotation, and transform.zw is the translatiob.
+const char* vertexShader = 
+"attribute vec4 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 * position; \n"
+"    gl_Position = fragmentPosition; \n"
+"    VertexColor = color; \n"
+"}";
+
+const char* fragmentShader = 
+"varying lowp vec4 VertexColor; \n"
+"void main() { \n"
+"    gl_FragColor = VertexColor; \n"
+"}";
+
+EM_BOOL onScreenSizeChanged_3D(int eventType, const EmscriptenUiEvent *uiEvent, void *userData) {
+    Renderer3D* renderer = (Renderer3D*)userData;
+    
+	EMSCRIPTEN_RESULT result = emscripten_set_canvas_element_size( renderer->context->query, uiEvent->documentBodyClientWidth, uiEvent->documentBodyClientHeight);
+	if (result != EMSCRIPTEN_RESULT_SUCCESS) {
+		logger_error("Failed to resize element at query: %s\n", renderer->context->query);
+	}
+	//renderer->projection = Mat4x4().getOrthographicMatrix(0, renderer->context->width, 0, renderer->context->height);
+
+    return true;
+}
+
+void Renderer3D::load(WebglContext* inContext) {
+	context = inContext;
+	printf("Compiling Renderer2d shader...\n");
+	shader = loadShader(vertexShader, fragmentShader);
+
+	useShader(shader);
+	attributes.position = getShaderAttribute(shader, "position");
+	attributes.color = getShaderAttribute(shader, "color");
+	uniforms.projection = getShaderUniform(shader, "projection");
+	uniforms.model = getShaderUniform(shader, "model");
+	projection = Mat4x4().getPerspectiveProjection(0.1, 100.f, DEG_TO_RAD(60.f), static_cast<f32>(context->width) / static_cast<f32>(context->height));
+
+	logger_info("Renderer2d shader compiled.\n");
+
+	emscripten_set_resize_callback(EMSCRIPTEN_EVENT_TARGET_WINDOW, this, false, onScreenSizeChanged_3D);
+}
+	
+void Renderer3D::render() {
+	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 Renderer3D::unload() {
+	glClearColor(0.f, 0.f, 0.f, 0.f);
+    glClear(GL_COLOR_BUFFER_BIT);
+	glDeleteProgram(shader);
+}
-- 
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