in practice chapter

1 files changed, 62 insertions, 0 deletions

diff --git a/in_practice/debug/debug.c b/in_practice/debug/debug.c
new file mode 100644
index 0000000..8cddc16
--- /dev/null
+++ b/in_practice/debug/debug.c
@@ -0,0 +1,62 @@
+#include <GL/glew.h>
+#include <GLFW/glfw3.h>
+
+#include "common.h"
+
+int main(void)
+{
+	state_t state = init_state(1600, 800, 1);
+	init_glfw(&state);
+	init_gl();
+
+	F32 vertices[] = {
+		-0.5f, -0.5f,
+		 0.0f,  0.5f,
+		 0.5f, -0.5f
+	};
+	U32 indices[] = {
+		0, 1, 2
+	};
+	U32 vao = 0, vbo = 0, ebo = 0;
+	glGenVertexArrays(1, &vao);
+	glGenBuffers(1, &ebo);
+	glGenBuffers(1, &vbo);
+	glBindVertexArray(vao);
+	glBindBuffer(GL_ARRAY_BUFFER, vbo);
+	glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
+	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ebo);
+	glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW);
+	glEnableVertexAttribArray(0);
+	glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 2 * sizeof(F32), 0);
+	glBindVertexArray(0);
+
+	add_shader("shader.vert", "shader.frag", 0);
+	U32 shader = find_shader("shader");
+	glUseProgram(shader);
+
+	glClearColor(0.16f, 0.16f, 0.16f, 1.0f);
+	glBindVertexArray(vao);
+
+	V2F offset = v2f(0.0f, 0.0f);
+	F32 time = 0.0f;
+
+	while (!glfwWindowShouldClose(state.window)) {
+		handle_glfw_events(state.window, &state.input);
+		F32 dt = lock_framerate(60);
+
+		/* update */
+		offset.x += 0.5f * dt;
+
+		/* render */
+		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+		glUniform2fv(glGetUniformLocation(shader, "offset"), 1, (F32 *)&offset);
+		glUniform1f(glGetUniformLocation(shader, "time"), time);
+		glDrawElements(GL_TRIANGLES, 3,  GL_UNSIGNED_INT, 0);
+
+		glfwSwapBuffers(state.window);
+
+		time += dt;
+	}
+
+	return 0;
+}