1 files changed, 103 insertions, 0 deletions
diff --git a/chisel/backends/opengl/gl_window.cpp b/chisel/backends/opengl/gl_window.cpp
new file mode 100644
index 0000000..66b8681
--- /dev/null
+++ b/chisel/backends/opengl/gl_window.cpp
@@ -0,0 +1,103 @@
+#include "gl_window.h"
+
+#include <string>
+#include "gfx.h"
+#include "program.h"
+#include "shader.h"
+
+namespace chisel {
+    const std::string vertex_shader = 
+	"#version 330\n"
+	"in vec3 pos;\n"
+	"out vec3 pos_barycentric;\n"
+	"\n"
+	"void main() {\n"
+		"gl_Position = vec4(pos, 1.0);\n"
+		"int m = int(mod(gl_VertexID, 3));\n"
+		"float t[3] = float[](0.0, 0.0, 0.0);\n"
+		"t[m] = 1.0;\n"
+		"pos_barycentric = vec3(t[0], t[1], t[2]);\n"
+	"}\n";
+
+    const std::string fragment_shader =
+    "#version 330\n"
+    "out vec4 color;\n"
+    "in vec3 pos_barycentric;\n"
+    "void main() {\n"
+        "float trigger = pos_barycentric.x/2 + pos_barycentric.y;\n"
+        "float criteria = trigger*trigger - pos_barycentric.y;\n"
+        "float delta = 3*fwidth(criteria)/5;\n"
+        "float alpha = 1 - smoothstep(-delta, delta, criteria);\n"
+        "color = vec4(pos_barycentric, alpha);\n"
+    "}\n";
+
+    void glfw_init() {
+        // Initialize glfw
+        glfwInit();
+
+        // Set OpenGL version
+        glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
+        glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
+    }
+
+    void glfw_finish() {
+        glfwTerminate();
+    }
+
+    int GLWindow::gl_window_count = 0;
+
+    GLWindow::GLWindow() {
+        if (gl_window_count++ == 0)
+            glfw_init();
+
+        // Create the window
+        glfw_window = glfwCreateWindow(600, 400, "gl", nullptr, nullptr);
+
+        // Create OpenGL context
+        glfwMakeContextCurrent(glfw_window);
+        gladLoadGLLoader((GLADloadproc)glfwGetProcAddress);
+    
+        auto program = gfx::Program();
+        {
+            auto vs = gfx::Shader(vertex_shader, gfx::VERTEX_SHADER);
+            auto fs = gfx::Shader(fragment_shader, gfx::FRAGMENT_SHADER);
+
+            program.attach(vs);
+            program.attach(fs);
+            program.link();
+        }
+        program.use();
+
+        while (true) {
+            glfwPollEvents();
+
+            if (glfwWindowShouldClose(glfw_window))
+                break;
+            
+            int w, h;
+            glfwGetWindowSize(glfw_window, &w, &h);
+
+            width = (float)w;
+            height = (float)h;
+
+            glViewport(0, 0, w, h);
+            glClearColor(1.0, 1.0, 1.0, 1.0);
+            glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+            float b[] = {
+
+
+            };
+
+            glfwSwapInterval(1);
+            glfwSwapBuffers(glfw_window);
+        }
+    }
+
+    GLWindow::~GLWindow() {
+        glfwDestroyWindow(glfw_window);
+
+        if (--gl_window_count == 0)
+            glfw_finish();
+    }
+}
+\ No newline at end of file