move opengl to renderer dir

src/renderer/opengl/Shader.zig

@@ -0,0 +1,56 @@
+const Shader = @This();
+
+const std = @import("std");
+const assert = std.debug.assert;
+const log = std.log.scoped(.opengl);
+
+const c = @import("c.zig");
+const errors = @import("errors.zig");
+const glad = @import("glad.zig");
+
+id: c.GLuint,
+
+pub inline fn create(typ: c.GLenum) errors.Error!Shader {
+    const id = glad.context.CreateShader.?(typ);
+    if (id == 0) {
+        try errors.mustError();
+        unreachable;
+    }
+
+    log.debug("shader created id={}", .{id});
+    return Shader{ .id = id };
+}
+
+/// Set the source and compile a shader.
+pub inline fn setSourceAndCompile(s: Shader, source: [:0]const u8) !void {
+    glad.context.ShaderSource.?(s.id, 1, &@ptrCast([*c]const u8, source), null);
+    glad.context.CompileShader.?(s.id);
+
+    // Check if compilation succeeded
+    var success: c_int = undefined;
+    glad.context.GetShaderiv.?(s.id, c.GL_COMPILE_STATUS, &success);
+    if (success == c.GL_TRUE) return;
+    log.err("shader compilation failure id={} message={s}", .{
+        s.id,
+        std.mem.sliceTo(&s.getInfoLog(), 0),
+    });
+    return error.CompileFailed;
+}
+
+/// getInfoLog returns the info log for this shader. This attempts to
+/// keep the log fully stack allocated and is therefore limited to a max
+/// amount of elements.
+//
+// NOTE(mitchellh): we can add a dynamic version that uses an allocator
+// if we ever need it.
+pub inline fn getInfoLog(s: Shader) [512]u8 {
+    var msg: [512]u8 = undefined;
+    glad.context.GetShaderInfoLog.?(s.id, msg.len, null, &msg);
+    return msg;
+}
+
+pub inline fn destroy(s: Shader) void {
+    assert(s.id != 0);
+    glad.context.DeleteShader.?(s.id);
+    log.debug("shader destroyed id={}", .{s.id});
+}