1 files changed, 143 insertions, 0 deletions
diff --git a/gltest.c b/gltest.c
new file mode 100644
index 0000000..e40ee0f
--- /dev/null
+++ b/gltest.c
@@ -0,0 +1,143 @@
+/*
+ * Copyright (C) 2018 Tomasz Kramkowski <tk@the-tk.com>
+ * SPDX-License-Identifier: MIT
+ */
+#include <GLFW/glfw3.h>
+#include <stdbool.h>
+
+#include "eprintf.h"
+#include "gldefs.h"
+#include "linmath.h"
+#include "loadgl.h"
+#include "shaders.h"
+
+enum {
+	WIDTH = 800,
+	HEIGHT = 600,
+	LOGSIZE = 1024,
+};
+
+void fb_size_cb(GLFWwindow *win, int width, int height)
+{
+	(void)win;
+	gl_viewport(0, 0, width, height);
+}
+
+void take_input(GLFWwindow *win)
+{
+	if (glfwGetKey(win, GLFW_KEY_ESCAPE) == GLFW_PRESS)
+		glfwSetWindowShouldClose(win, true);
+}
+
+GLuint load_shader(GLenum type, const char *data, GLint size)
+{
+	GLuint shdr;
+	GLint success;
+	char log[LOGSIZE];
+
+	shdr = gl_shdr_create(type);
+	gl_shdr_source(shdr, 1, &data, &size);
+	gl_shdr_compile(shdr);
+	gl_shdr_param(shdr, GL_COMPILE_STATUS, &success);
+
+	if (!success) {
+		gl_shdr_infolog(shdr, sizeof log, NULL, log);
+		eprintf("Failed to compile shader:\n%s", log);
+	}
+
+	return shdr;
+}
+
+GLuint load_prog(void)
+{
+	GLuint vert, frag, prog;
+	GLuint success;
+	char log[LOGSIZE];
+
+	vert = load_shader(GL_VERTEX_SHADER, shader_vert_data, shader_vert_size);
+	frag = load_shader(GL_FRAGMENT_SHADER, shader_frag_data, shader_frag_size);
+	prog = gl_prog_create();
+	gl_prog_attachshdr(prog, vert);
+	gl_prog_attachshdr(prog, frag);
+	gl_prog_link(prog);
+	gl_prog_param(prog, GL_COMPILE_STATUS, &success);
+	if (!success) {
+		gl_prog_infolog(prog, sizeof log, NULL, log);
+		eprintf("Failed to link program:\n%s", log);
+	}
+	gl_shdr_del(vert);
+	gl_shdr_del(frag);
+
+	return prog;
+}
+
+int main(int argc, char **argv)
+{
+	GLFWwindow *win;
+	int ret;
+	GLuint ebo, vbo, vao, prog;
+	vec3 verts[] = {
+		{  0.5f,  0.5f, 0.0f },
+		{  0.5f, -0.5f, 0.0f },
+		{ -0.5f, -0.5f, 0.0f },
+		{ -0.5f,  0.5f, 0.0f },
+	};
+	GLuint idxs[] = {
+		0, 1, 3,
+		1, 2, 3,
+	};
+
+	setprogname(argc >= 1 && argv[0] != NULL ? argv[0] : "gltest");
+
+	glfwInit();
+
+	glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
+	glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
+	glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+
+	win = glfwCreateWindow(WIDTH, HEIGHT, "gltest", NULL, NULL);
+	if (win == NULL)
+		eprintf("Failed to create GLFW window");
+	glfwMakeContextCurrent(win);
+
+	ret = lgl_load((lgl_loadfunc *)glfwGetProcAddress);
+	if (ret != 0)
+		eprintf("Failed to load GL: %s", lgl_strerror(ret));
+	glfwSetFramebufferSizeCallback(win, &fb_size_cb);
+	fb_size_cb(win, WIDTH, HEIGHT);
+
+	gl_buf_gen(1, &vbo);
+	gl_buf_gen(1, &ebo);
+	gl_va_gen(1, &vao);
+
+	gl_va_bind(vao);
+
+	gl_buf_bind(GL_ARRAY_BUFFER, vbo);
+	gl_buf_data(GL_ARRAY_BUFFER, sizeof verts, verts, GL_STATIC_DRAW);
+
+	gl_buf_bind(GL_ELEMENT_ARRAY_BUFFER, ebo);
+	gl_buf_data(GL_ELEMENT_ARRAY_BUFFER, sizeof idxs, idxs, GL_STATIC_DRAW);
+
+	gl_va_define(0, 3, GL_FLOAT, GL_FALSE, sizeof *verts, 0);
+	gl_va_enable(0);
+
+	prog = load_prog();
+
+	gl_poly_mode(GL_FRONT_AND_BACK, GL_LINE);
+
+	while (!glfwWindowShouldClose(win)) {
+		take_input(win);
+
+		gl_clearcolor(0.2, 0.3, 0.3, 1.0);
+		gl_clear(GL_COLOR_BUFFER_BIT);
+		gl_prog_use(prog);
+		gl_va_bind(vao);
+		gl_draw_elems(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
+		gl_va_bind(0);
+
+		glfwSwapBuffers(win);
+		glfwPollEvents();
+	}
+
+	glfwTerminate();
+}