Shader, first drawing

1 files changed, 64 insertions, 0 deletions

diff --git a/src/shader.c b/src/shader.c
new file mode 100644
index 0000000..4934dcd
--- /dev/null
+++ b/src/shader.c
@@ -0,0 +1,64 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   shader.c                                           :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: charles <charles.cabergs@gmail.com>        +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2020/05/11 09:35:54 by charles           #+#    #+#             */
+/*   Updated: 2020/05/11 10:54:14 by charles          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "scop.h"
+
+#define SHADER_VERTEX_FILEPATH   "shader/vertex.glsl"
+#define SHADER_FRAGMENT_FILEPATH "shader/fragment.glsl"
+
+static unsigned int	st_compile(char *filepath, unsigned int type)
+{
+	char			*src;
+	unsigned int	id;
+	int				result;
+	int				len;
+	char			*msg;
+
+	if ((src = ft_getfile(open(filepath, O_RDONLY))) == NULL)
+		return (0);
+	GL_CALL(id = glCreateShader(type));
+	GL_CALL(glShaderSource(id, 1, (const char**)&src, NULL));
+	free(src);
+	GL_CALL(glCompileShader(id));
+	GL_CALL(glGetShaderiv(id, GL_COMPILE_STATUS, &result));
+	if (result == GL_FALSE)
+	{
+		GL_CALL(glGetShaderiv(id, GL_INFO_LOG_LENGTH, &len));
+		if ((msg = malloc(sizeof(char) * (len + 1))) == NULL)
+			return (0);
+		GL_CALL(glGetShaderInfoLog(id, len, &len, msg));
+		ft_putendl(msg);
+		free(msg);
+		GL_CALL(glDeleteShader(id));
+		return (0);
+	}
+	return (id);
+}
+
+unsigned int	shader_new(void)
+{
+	unsigned int	shader_vertex;
+	unsigned int	shader_fragment;
+	unsigned int	program;
+
+	if ((shader_vertex = st_compile(SHADER_VERTEX_FILEPATH, GL_VERTEX_SHADER)) == 0
+		|| (shader_fragment = st_compile(SHADER_FRAGMENT_FILEPATH, GL_FRAGMENT_SHADER)) == 0)
+		return (0);
+	GL_CALL(program = glCreateProgram());
+	GL_CALL(glAttachShader(program, shader_vertex));
+	GL_CALL(glAttachShader(program, shader_fragment));
+	GL_CALL(glLinkProgram(program));
+	GL_CALL(glValidateProgram(program));
+	GL_CALL(glDeleteShader(shader_vertex));
+	GL_CALL(glDeleteShader(shader_fragment));
+	return (program);
+}