1 files changed, 48 insertions, 0 deletions
diff --git a/shader.c b/shader.c
new file mode 100644
index 0000000..df17d5d
--- /dev/null
+++ b/shader.c
@@ -0,0 +1,48 @@
+#include "shader.h"
+
+#include "die.h"
+
+void check_shader(GLuint shader) {
+	int success;
+	char debug[LOG_MAX];
+	glGetShaderiv(shader, GL_COMPILE_STATUS, &success);
+	if (success) return;
+	glGetShaderInfoLog(shader, LOG_MAX, NULL, debug);
+	die("error: shader compilation failed:\n%s\n", debug);
+}
+
+void check_program(GLuint program) {
+	int success;
+	char debug[LOG_MAX];
+	glGetProgramiv(program, GL_LINK_STATUS, &success);
+	if (success) return;
+	glGetProgramInfoLog(program, LOG_MAX, NULL, debug);
+	die("error: shader linking failed:\n%s\n", debug);
+}
+
+GLuint load_shader(GLenum type, const char* const src, size_t src_size) {
+	GLuint shader = glCreateShader(type);
+	glShaderSource(shader, 1, &src, (const int*) &src_size);
+	glCompileShader(shader);
+	check_shader(shader);
+	return shader;
+}
+
+GLuint frag_shader(const char* const src, size_t src_size) {
+	return load_shader(GL_FRAGMENT_SHADER, src, src_size);
+}
+GLuint vert_shader(const char* const src, size_t src_size) {
+	return load_shader(GL_VERTEX_SHADER, src, src_size);
+}
+
+GLuint link_shaders(GLuint vert, GLuint frag) {
+	GLuint shader = glCreateProgram();
+	glAttachShader(shader, vert);
+	glAttachShader(shader, frag);
+	glLinkProgram(shader);
+	check_program(shader);
+	glDeleteShader(vert);
+	glDeleteShader(frag);
+	return shader;
+}
+