Shaders are objects;

src/graphics.c

@@ -50,8 +50,8 @@ int lovrGraphicsSetClearColor(lua_State* L) {
 
 // TODO default shader
 int lovrGraphicsSetShader(lua_State* L) {
-  GLuint shader = (GLuint) luaL_checknumber(L, 1);
-  glUseProgram(shader);
+  Shader* shader = (Shader*) luax_checkshader(L, 1);
+  glUseProgram(shader->id);
 
   return 0;
 }
@@ -94,10 +94,13 @@ int lovrGraphicsNewShader(lua_State* L) {
 
   GLuint vertexShader = compileShader(GL_VERTEX_SHADER, vertexShaderSource);
   GLuint fragmentShader = compileShader(GL_FRAGMENT_SHADER, fragmentShaderSource);
-  GLuint shader = linkShaders(vertexShader, fragmentShader);
+  GLuint id = linkShaders(vertexShader, fragmentShader);
+
+  Shader* shader = (Shader*) malloc(sizeof(Shader));
+  shader->id = id;
 
   if (shader) {
-    lua_pushnumber(L, shader);
+    luax_pushshader(L, shader);
   } else {
     lua_pushnil(L);
   }
@@ -122,5 +125,6 @@ int lovrPushGraphics(lua_State* L) {
   luaL_register(L, NULL, lovrGraphics);
   luaRegisterType(L, "Model", lovrModel);
   luaRegisterType(L, "Buffer", lovrBuffer);
+  luaRegisterType(L, "Shader", lovrShader);
   return 1;
 }

src/shader.c

@@ -2,6 +2,19 @@
 #include <stdlib.h>
 #include "util.h"
 
+void luax_pushshader(lua_State* L, Shader* shader) {
+  Shader** userdata = (Shader**) lua_newuserdata(L, sizeof(Shader*));
+
+  luaL_getmetatable(L, "Shader");
+  lua_setmetatable(L, -2);
+
+  *userdata = shader;
+}
+
+Shader* luax_checkshader(lua_State* L, int index) {
+  return *(Shader**) luaL_checkudata(L, index, "Shader");
+}
+
 GLuint compileShader(GLenum type, const char* source) {
   GLuint shader = glCreateShader(type);
 
@@ -51,3 +64,7 @@ GLuint linkShaders(GLuint vertexShader, GLuint fragmentShader) {
 
   return shader;
 }
+
+const luaL_Reg lovrShader[] = {
+  { NULL, NULL }
+};

src/shader.h

@@ -1,4 +1,16 @@
+#include <lua.h>
+#include <lauxlib.h>
+#include <lualib.h>
 #include "glfw.h"
 
+typedef struct {
+  GLuint id;
+} Shader;
+
+void luax_pushshader(lua_State* L, Shader* shader);
+Shader* luax_checkshader(lua_State* L, int index);
+
 GLuint compileShader(GLuint type, const char* filename);
 GLuint linkShaders(GLuint vertexShader, GLuint fragmentShader);
+
+extern const luaL_Reg lovrShader[];