#include <GL/gl.h> #include <emscripten/emscripten.h> void draw() glClear(GL_COLOR_BUFFER_BIT); glBegin(GL_TRIANGLES); glColor3f(1.0, 0.0, 0.0); glVertex2f(-0.5, -0.5); glColor3f(0.0, 1.0, 0.0); glVertex2f(0.5, -0.5); glColor3f(0.0, 0.0, 1.0); glVertex2f(0.0, 0.5); glEnd();
Instead of standard Emscripten, use the Rexo compiler:
npm install -g rexo-web-cli Create a file called triangle.cpp : opengl by rexo web
rexo compile triangle.cpp -o triangle.html Rexo Web includes a development server:
int main() // Rexo Web will hook into this loop automatically emscripten_set_main_loop(draw, 0, 1); return 0; #include <GL/gl
WebGPU is the future—it is modern, fast, and designed for the web. However, WebGPU is a new API. offers immediate value for legacy codebases . Furthermore, the Rexo team has announced "Rexo Next," which will act as a translation layer from OpenGL to WebGPU. This means your existing OpenGL code will eventually run even faster on future browsers without changing a single line of code. Conclusion: Is OpenGL by Rexo Web Right for You? OpenGL by Rexo Web represents a paradigm shift. For too long, web graphics have been the "second-class citizen" compared to desktop Vulkan, DirectX, or OpenGL. This technology bridges the gap.
This article dives deep into what is, how it differs from standard web graphics APIs, its core architecture, practical use cases, and a step-by-step guide to getting started. What is OpenGL by Rexo Web? At its core, OpenGL by Rexo Web is a specialized, optimized implementation of the OpenGL (Open Graphics Library) specification tailored for web environments. OpenGL itself is a cross-language, cross-platform application programming interface for rendering 2D and 3D vector graphics. Typically, OpenGL communicates directly with the Graphics Processing Unit (GPU). Furthermore, the Rexo team has announced "Rexo Next,"
The biggest gains are seen in scenes and shader management . Because Rexo Web batches OpenGL commands asynchronously, the CPU overhead per draw call is massively reduced. Potential Drawbacks and Considerations While OpenGL by Rexo Web is powerful, it isn't a silver bullet. Security & Sandboxing Browsers are designed to isolate web pages. Because Rexo Web uses SharedArrayBuffer and OffscreenCanvas, your site must be cross-origin isolated (requiring specific COOP/COEP headers). Without these, the multi-threading features will fail. Debugging Complexity Standard browser DevTools are optimized for JavaScript and WebGL. Debugging a WebAssembly app that uses OpenGL commands passed to a worker is harder. You often need to use rexo inspect commands rather than Chrome's native graphics inspector. Learning Curve If you are a pure JavaScript developer, learning classic OpenGL (which uses state machines and pointers) is a steeper curve than learning Three.js (which abstracts WebGL). Rexo Web is best for teams migrating from C++ or needing raw performance. The Future: OpenGL, WebGPU, and Rexo You might be wondering: "WebGPU is coming, why do I need OpenGL by Rexo Web?"