refactor all the rendering code

13 files changed, 352 insertions, 83 deletions

diff --git a/src/objects/effect.c b/src/objects/effect.c
index 7458f62..f90fad8 100644
--- a/src/objects/effect.c
+++ b/src/objects/effect.c
@@ -1,5 +1,13 @@
 #include "effect.h"
+
+#include "../engine.h"
 #include "../json.h"
+#include "../log.h"
+
+#include "cglm/mat4.h"
+#include "src/objects/pass.h"
+#include "src/objects/types.h"
+#include <jansson.h>
 
 void mri_effect_parse(mri_effect *effect, json_t *root) {
   mvec_init(effect->passes0);
@@ -20,6 +28,8 @@ void mri_effect_parse(mri_effect *effect, json_t *root) {
 
     json_t *_root = json_load_mstr(mri_asset_as_str(effect_asset));
 
+    effect->name = mstr_from(json_string_value(json_object_get(_root, "name")));
+
     json_t *pass1;
     json_t *passes1 = json_object_get(_root, "passes");
     json_array(pass1, passes1) {
@@ -28,16 +38,43 @@ void mri_effect_parse(mri_effect *effect, json_t *root) {
   }
 }
 
+mri_render_pass *mri_effect_next_pass(mri_effect *effect) {
+  mri_render_pass *pass = mvec_next(effect->passes);
+  mvec_init(pass->uniforms);
+  mvec_init(pass->combos);
+  return pass;
+}
+
 void mri_effect_load(mri_engine *engine, mri_effect *effect) {
-  mri_engine_next_effect(engine);
-  for (int i = 0; i < mvec_size(effect->passes0); i++) {
-    mri_engine_next_pass(engine);
-    mri_pass_load(engine, mvec_at(effect->passes0, i), EFFECT0_PASS);
-    mri_pass_load(engine, mvec_at(effect->passes1, i), EFFECT1_PASS);
+  for (unsigned int i = 0; i < mvec_size(effect->passes0); i++) {
+    mri_render_pass *pass = mri_effect_next_pass(effect);
+
+    if (i == mvec_size(effect->passes0) - 1) {
+      pass->combine = true;
+    }
+
+    pass->object = engine->current_object;
+    pass->gl_object = &engine->default_gl_object;
+
+    glm_mat4_identity(pass->model);
+
+    mri_pass_load(engine, mvec_at(effect->passes0, i), EFFECT0_PASS, pass);
+    mri_pass_load(engine, mvec_at(effect->passes1, i), EFFECT1_PASS, pass);
+  }
+}
+
+void mri_effect_draw(mri_engine *engine, mri_effect *effect) {
+  mri_render_pass *pass;
+  mvec_loop_ptr(effect->passes, pass, i) {
+    log_debug("effect (%.*s): %.*s %i", pass->object->name->len, pass->object->name->ptr,
+      effect->name->len, effect->name->ptr, i + 1);
+    mri_render_pass_draw(engine, pass);
   }
 }
 
 void mri_effect_unload(mri_effect *effect) {
+  mstr_free(effect->name);
+
   mri_pass *pass;
 
   mvec_loop_ptr(effect->passes0, pass, i) {
diff --git a/src/objects/effect.h b/src/objects/effect.h
index 76af254..9570fde 100644
--- a/src/objects/effect.h
+++ b/src/objects/effect.h
@@ -7,12 +7,16 @@
 #include "pass.h"
 
 struct mri_effect {
+  mstr *name;
+
   mvec(mri_pass) passes0;
   mvec(mri_pass) passes1;
+  mvec(mri_render_pass) passes;
 };
 
 void mri_effect_parse(mri_effect *effect, json_t *root);
 void mri_effect_load(mri_engine *engine, mri_effect *effect);
+void mri_effect_draw(mri_engine *engine, mri_effect *effect);
 void mri_effect_unload(mri_effect *effect);
 
 #endif // _EFFECT_H
diff --git a/src/objects/material.c b/src/objects/material.c
index d934970..2076274 100644
--- a/src/objects/material.c
+++ b/src/objects/material.c
@@ -1,10 +1,13 @@
 #include "material.h"
+#include "cglm/mat4.h"
 #include "pass.h"
 
 #include <moro_str.h>
 
 #include "../log.h"
 #include "../json.h"
+#include "../engine.h"
+#include "src/objects/types.h"
 
 void mri_material_parse(mri_material *material, json_t *value) {
   mvec_init(material->passes);
@@ -20,32 +23,54 @@ void mri_material_parse(mri_material *material, json_t *value) {
     json_t *pass;
     json_t *passes = json_object_get(root, "passes");
     json_array(pass, passes) {
-      mri_pass_parse(mvec_next(material->passes), pass, MATERIAL_PASS);
+      mri_pass_parse(mvec_next(material->passes0), pass, MATERIAL_PASS);
     }
 
     json_decref(root);
   }
 }
 
-void mri_material_load(mri_engine *engine, mri_material *material, mri_material_type t) {
-  mri_pass *pass;
-  mvec_loop_ptr(material->passes, pass, i) {
+mri_render_pass *mri_material_next_pass(mri_material *material) {
+  mri_render_pass *pass = mvec_next(material->passes);
+  mvec_init(pass->uniforms);
+  mvec_init(pass->combos);
+  return pass;
+}
+
+void mri_material_load(mri_engine *engine, mri_material *material, mri_material_type t,
+  mri_render_pass *pass) {
+  mri_pass *pass0;
+  mvec_loop_ptr(material->passes0, pass0, i) {
     switch (t) {
     case MATERIAL_EFFECT:
-      mri_pass_load(engine, pass, MATERIAL_PASS);
+      mri_pass_load(engine, pass0, MATERIAL_PASS, pass);
       break;
     case MATERIAL_MODEL:
-      mri_engine_next_pass(engine);
-      mri_pass_load(engine, pass, MATERIAL_ONLY_PASS);
+      pass = mri_material_next_pass(material);
+
+      pass->object = engine->current_object;
+      pass->gl_object = &engine->current_object->gl_uv_object;
+
+      glm_mat4_copy(engine->current_object->ortho, pass->model);
+
+      mri_pass_load(engine, pass0, MATERIAL_ONLY_PASS, pass);
       break;
     }
   }
 }
 
-void mri_material_unload(mri_material *material) {
-  mri_pass *pass;
+void mri_material_draw(mri_engine *engine, mri_material *material) {
+  mri_render_pass *pass;
   mvec_loop_ptr(material->passes, pass, i) {
-    mri_pass_unload(pass);
+    log_debug("background (%.*s): %i", pass->object->name->len, pass->object->name->ptr, i);
+    mri_render_pass_draw(engine, pass);
+  }
+}
+
+void mri_material_unload(mri_material *material) {
+  mri_pass *pass0;
+  mvec_loop_ptr(material->passes0, pass0, i) {
+    mri_pass_unload(pass0);
   }
   mvec_free(material->passes);
 }
diff --git a/src/objects/material.h b/src/objects/material.h
index 805a198..5c8f7b5 100644
--- a/src/objects/material.h
+++ b/src/objects/material.h
@@ -12,11 +12,13 @@ typedef enum {
 } mri_material_type;
 
 struct mri_material {
-  mvec(mri_pass) passes;
+  mvec(mri_pass) passes0;
+  mvec(mri_render_pass) passes;
 };
 
 void mri_material_parse(mri_material *material, json_t *value);
-void mri_material_load(mri_engine *engine, mri_material *material, mri_material_type t);
+void mri_material_load(mri_engine *engine, mri_material *material, mri_material_type t, mri_render_pass *pass);
+void mri_material_draw(mri_engine *engine, mri_material *material);
 void mri_material_unload(mri_material *material);
 
 #endif // MATERIAL_H
diff --git a/src/objects/model.c b/src/objects/model.c
index 3fe8e1d..81cd0b0 100644
--- a/src/objects/model.c
+++ b/src/objects/model.c
@@ -4,8 +4,10 @@
 #include "../json.h"
 #include "../assets.h"
 #include "../log.h"
+#include "../engine.h"
 
 #include "model.h"
+#include "src/objects/types.h"
 
 void mri_model_parse(mri_model *model, json_t *value) {
   if (json_is_string(value)) {
@@ -29,8 +31,11 @@ void mri_model_parse(mri_model *model, json_t *value) {
 }
 
 void mri_model_load(mri_engine *engine, mri_model *model) {
-  engine->current_effect = &engine->current_object->background;
-  mri_material_load(engine, &model->material, MATERIAL_MODEL);
+  mri_material_load(engine, &model->material, MATERIAL_MODEL, NULL);
+}
+
+void mri_model_draw(mri_engine *engine, mri_model *model) {
+  mri_material_draw(engine, &model->material);
 }
 
 void mri_model_unload(mri_model *model) {
diff --git a/src/objects/model.h b/src/objects/model.h
index 38f4405..4d17c72 100644
--- a/src/objects/model.h
+++ b/src/objects/model.h
@@ -7,8 +7,6 @@
 #include "pass.h"
 #include "material.h"
 
-#include "../engine.h"
-
 struct mri_model {
   bool autosize;
   bool fullscreen;
@@ -18,6 +16,7 @@ struct mri_model {
 
 void mri_model_parse(mri_model *model, json_t *value);
 void mri_model_load(mri_engine *engine, mri_model *model);
+void mri_model_draw(mri_engine *engine, mri_model *model);
 void mri_model_unload(mri_model *model);
 
 #endif // _MODEL_H
diff --git a/src/objects/object.c b/src/objects/object.c
index ee96a9e..b3b57c2 100644
--- a/src/objects/object.c
+++ b/src/objects/object.c
@@ -1,17 +1,25 @@
 #include <jansson.h>
 #include <cglm/cglm.h>
 
+#include "moro_str.h"
+#include "src/shader.h"
+#include "src/texture.h"
+
 #include "types.h"
 #include "object.h"
 #include "model.h"
+#include "scene.h"
 
 #include "../log.h"
 #include "../gl.h"
+#include "../engine.h"
 #include "../json.h"
 
 void mri_object_parse(mri_object *object, json_t *root) {
   json_get_int(&object->id, root, "id");
 
+  object->name = mstr_from(json_string_value(json_object_get(root, "name")));
+
   mvec_init(object->deps);
 
   json_t *dep;
@@ -39,25 +47,7 @@ void mri_object_parse(mri_object *object, json_t *root) {
     json_get_bool(&object->passthrough, config, "passthrough");
   }
 
-  char *abuffer, *bbuffer;
-
-  asprintf(&abuffer, "_rt_imageLayerComposite_%i_a", object->id);
-  asprintf(&bbuffer, "_rt_imageLayerComposite_%i_b", object->id);
-
-  object->abuffer = mstr_from(abuffer);
-  object->bbuffer = mstr_from(bbuffer);
-
-  free(abuffer);
-  free(bbuffer);
-
-  json_t *image = json_object_get(root, "image");
-
-  if (json_is_string(image)) {
-    mri_model_parse(&object->image, image);
-    object->has_image = true;
-  } else {
-    object->has_image = false;
-  }
+  mri_model_parse(&object->image, json_object_get(root, "image"));
 
   mvec_init(object->effects);
 
@@ -92,7 +82,41 @@ void mri_object_get_model(mri_object *object, mat4 model, float width, float hei
 }
   
 void mri_object_load(mri_engine *engine, mri_object *object) {
-  mri_engine_next_object(engine, object);
+  engine->current_object = object;
+
+  float width = object->size[0];
+  float height = object->size[1];
+
+  // mstr_sprintf
+  char *abuffer, *bbuffer;
+
+  asprintf(&abuffer, "_rt_imageLayerComposite_%i_a", object->id);
+  asprintf(&bbuffer, "_rt_imageLayerComposite_%i_b", object->id);
+
+  object->abuffer = mri_engine_get_or_new_framebuffer(engine,
+    mstr_c(abuffer), width, height, 1.f,
+    engine->scene->clear_color);
+
+  object->bbuffer = mri_engine_get_or_new_framebuffer(engine,
+    mstr_c(bbuffer), width, height, 1.f,
+    engine->scene->clear_color);
+
+  free(abuffer);
+  free(bbuffer);
+
+  object->buffer_switch = false;
+
+  mri_object_get_model(object, engine->current_object->model,
+    engine->width, engine->height);
+
+  glm_ortho(-width, width, -height, height, 0.f, 1.f,
+    engine->current_object->ortho);
+
+  create_gl_object(&engine->current_object->gl_uv_object,
+    UV_SCALE, width, height);
+
+  create_gl_object(&engine->current_object->gl_object,
+    OBJECT, width, height);
 
   mri_model_load(engine, &object->image);
 
@@ -114,7 +138,51 @@ void mri_object_load(mri_engine *engine, mri_object *object) {
   }
 }
 
+static void center_scale(float w0, float h0, float w1, float h1) {
+  float w_scale = w1 / w0;
+  float h_scale = h1 / h0;
+
+  float scale = (w_scale > h_scale) ? w_scale : h_scale;
+
+  float width = w0 * scale;
+  float height = h0 * scale;
+
+  float wpad = (width - w1) / -2.f;
+  float hpad = (height - h1) / -2.f;
+
+  glViewport(wpad, hpad, width, height);
+}
+
+void mri_object_draw(mri_engine *engine, mri_object *object) {
+  mri_model_draw(engine, &object->image);
+
+  mri_effect *effect;
+  mvec_loop_ptr(object->effects, effect, i) {
+    mri_effect_draw(engine, effect);
+  }
+
+  mri_framebuffer_bind(engine->combine_buffer, false);
+
+  if (object->buffer_switch) {
+    mri_texture_bind(&object->bbuffer->texture, 0);
+  } else {
+    mri_texture_bind(&object->abuffer->texture, 0);
+  }
+
+  mri_shader_bind(engine, &engine->mininal_shader, object->model);
+
+  bind_gl_object(&object->gl_object);
+
+  center_scale(engine->width, engine->height, engine->context->width, engine->context->height);
+
+  glDrawArrays(GL_TRIANGLES, 0, 6);
+
+  log_debug("combine (%.*s)", object->name->len, object->name->ptr);
+}
+
 void mri_object_unload(mri_object *object) {
+  mstr_free(object->name);
+
   mri_effect *effect;
   mvec_loop_ptr(object->effects, effect, i) {
     mri_effect_unload(effect);
@@ -123,8 +191,8 @@ void mri_object_unload(mri_object *object) {
   mvec_free(object->effects);
   mvec_free(object->deps);
 
-  mstr_free(object->abuffer);
-  mstr_free(object->bbuffer);
+  mri_framebuffer_unload(object->abuffer);
+  mri_framebuffer_unload(object->bbuffer);
 
   mri_model_unload(&object->image);
 }
diff --git a/src/objects/object.h b/src/objects/object.h
index 7c6969b..c7bb883 100644
--- a/src/objects/object.h
+++ b/src/objects/object.h
@@ -6,6 +6,7 @@
 #include <stdbool.h>
 #include <cglm/cglm.h>
 
+#include "src/texture.h"
 #include "types.h"
 #include "model.h"
 #include "pass.h"
@@ -19,6 +20,7 @@ typedef enum {
 
 struct mri_object {
   int id;
+  mstr *name;
 
   mvec(int) deps;
 
@@ -34,7 +36,6 @@ struct mri_object {
   bool copy_background;
 
   mri_model image;
-  bool has_image;
 
   vec2 size;
   vec3 origin;
@@ -45,8 +46,16 @@ struct mri_object {
   bool passthrough;
   bool fullscreen;
 
-  mstr *abuffer;
-  mstr *bbuffer;
+  gl_object gl_uv_object;
+  gl_object gl_object;
+  
+  mat4 ortho;
+  mat4 model;
+
+  mri_framebuffer *abuffer;
+  mri_framebuffer *bbuffer;
+
+  bool buffer_switch;
 
   mvec(mri_effect) effects;
 };
@@ -55,6 +64,7 @@ void mri_object_get_model(mri_object *object, mat4 model, float width, float hei
 
 void mri_object_parse(mri_object *object, json_t *root);
 void mri_object_load(mri_engine *engine, mri_object *object);
+void mri_object_draw(mri_engine *engine, mri_object *object);
 void mri_object_unload(mri_object *object);
 
 #endif // _OBJECT_H
diff --git a/src/objects/pass.c b/src/objects/pass.c
index fadac16..f0cac99 100644
--- a/src/objects/pass.c
+++ b/src/objects/pass.c
@@ -1,3 +1,5 @@
+#include <unistd.h>
+
 #include "pass.h"
 #include "material.h"
 #include "model.h"
@@ -5,8 +7,11 @@
 
 #include "../json.h"
 #include "../texture.h"
+#include "../engine.h"
 #include "../assets.h"
 #include "../gl.h"
+#include "src/objects/types.h"
+#include "src/shader.h"
 
 void mri_pass_parse(mri_pass *pass, json_t *root, mri_pass_stage stage) {
   memset(pass, 0, sizeof(mri_pass));
@@ -42,21 +47,18 @@ void mri_pass_parse(mri_pass *pass, json_t *root, mri_pass_stage stage) {
     }
     case EFFECT1_PASS: {
       json_t *material = json_object_get(root, "material");
-
       if (json_is_string(material)) {
         pass->material = (mri_material *)calloc(1, sizeof(mri_material));
         mri_material_parse(pass->material, material);
       }
 
       json_t *target = json_object_get(root, "target");
-
       if (json_is_string(target)) {
         pass->target = mstr_from(json_string_value(target));
       }
 
       json_t *bind;
       json_t *binds = json_object_get(root, "bind");
-
       json_array(bind, binds) {
         int index = json_integer_value(json_object_get(bind, "index"));
         pass->binds[index] = mstr_from(json_string_value(json_object_get(bind, "name")));
@@ -67,24 +69,22 @@ void mri_pass_parse(mri_pass *pass, json_t *root, mri_pass_stage stage) {
     case MATERIAL_ONLY_PASS:
     case MATERIAL_PASS: {
       json_t *shader = json_object_get(root, "shader");
-
       if (json_is_string(shader)) {
         pass->shader = (mri_shader *)calloc(1, sizeof(mri_shader));
         mri_shader_load(pass->shader, mstr_c(json_string_value(shader)));
       }
-
       break;
     }
   }
 
   json_t *texture;
   json_t *textures = json_object_get(root, "textures");
-
   json_array(texture, textures) {
     if (json_is_string(texture)) {
-      mri_asset *_a = mri_asset_manager_get(mstr_c(json_string_value(texture)), TEXTURE);
-      if (_a->type != ASSET_VOID) {
-        pass->textures[i] = mri_texture_load(_a);
+      mri_asset *texture_asset = mri_asset_manager_get(
+        mstr_c(json_string_value(texture)), TEXTURE);
+      if (texture_asset->type != ASSET_VOID) {
+        pass->textures[i] = mri_texture_load(texture_asset);
       }
     }
   }
@@ -113,9 +113,8 @@ void mri_pass_parse(mri_pass *pass, json_t *root, mri_pass_stage stage) {
   }
 }
 
-void mri_pass_load(mri_engine *engine, mri_pass *pass, mri_pass_stage stage) {
-  mri_render_object *robject = engine->current_object;
-  mri_render_pass *rpass = engine->current_pass;
+void mri_pass_load(mri_engine *engine, mri_pass *pass, mri_pass_stage stage, mri_render_pass *rpass) {
+  mri_object *object = engine->current_object;
 
   for (int i = 1; i < 7; i++) {
     if (pass->textures[i]) rpass->textures[i] = pass->textures[i];
@@ -135,44 +134,74 @@ void mri_pass_load(mri_engine *engine, mri_pass *pass, mri_pass_stage stage) {
       break;
     }
     case EFFECT1_PASS:
+      // If there is an explicit target framebuffer, set it.
       if (pass->target) {
         rpass->target = mri_engine_get_or_new_framebuffer(engine,
           pass->target, engine->width, engine->height, 2.f,
-         (vec4){0.f, 0.f, 0.f, 1.0f});
+          (vec4){0.f, 0.f, 0.f, 0.2f});
       } else {
-        if (!robject->buffer_switch) {
-          rpass->target = robject->bbuffer;
-          rpass->textures[0] = &robject->abuffer->texture;
+        // If no target was specified pick the next buffer in the
+        // alternating AB buffers.
+        if (object->buffer_switch) {
+          rpass->target = object->abuffer;
+          rpass->textures[0] = &object->bbuffer->texture;
         } else {
-          rpass->target = robject->abuffer;
-          rpass->textures[0] = &robject->bbuffer->texture;
+          rpass->target = object->bbuffer;
+          rpass->textures[0] = &object->abuffer->texture;
         }
-        robject->buffer_switch = !robject->buffer_switch;
       }
       for (int i = 0; i < 7; i++) {
         if (!pass->binds[i]) continue;
+        // If there are explicit binds given for this pass, set them.
         if (mstr_eq(pass->binds[i], mstr_c("previous"))) {
-          if (!robject->buffer_switch) {
-            rpass->textures[i] = &robject->bbuffer->texture;
+          if (object->buffer_switch) {
+            rpass->textures[i] = &object->bbuffer->texture;
           } else {
-            rpass->textures[i] = &robject->abuffer->texture;
+            rpass->textures[i] = &object->abuffer->texture;
           }
         } else {
           rpass->textures[i] = &mri_engine_get_framebuffer(engine, pass->binds[i])->texture;
         }
       }
-      mri_material_load(engine, pass->material, MATERIAL_EFFECT);
+      // If we selected one of the AB buffers, switch the flag after
+      // setting binds to keep the ordering correct.
+      if (!pass->target) 
+        object->buffer_switch = !object->buffer_switch;
+      mri_material_load(engine, pass->material, MATERIAL_EFFECT, rpass);
       break;
     case MATERIAL_ONLY_PASS:
-      rpass->target = robject->abuffer;
+      // This object has no effects so Texture0 is an image and draw on the A buffer.
+      rpass->target = object->abuffer;
       rpass->textures[0] = pass->textures[0];
     case MATERIAL_PASS: {
       memcpy(&rpass->shader, pass->shader, sizeof(mri_shader));
 
+      // mvec_clone
+      mvec_ptr(rpass->shader.uniforms) = (mri_uniform *)malloc(
+        sizeof(mri_uniform) * mvec_alloc(pass->shader->uniforms));
+      memcpy(mvec_ptr(rpass->shader.uniforms), mvec_ptr(pass->shader->uniforms),
+        sizeof(mri_uniform) * mvec_alloc(pass->shader->uniforms));
+
+      mvec_ptr(rpass->shader.combos) = (mri_combo *)malloc(
+        sizeof(mri_combo) * mvec_alloc(pass->shader->combos));
+      memcpy(mvec_ptr(rpass->shader.combos), mvec_ptr(pass->shader->combos),
+        sizeof(mri_combo) * mvec_alloc(pass->shader->combos));
+
       for (int i = 0; i < 7; i++) {
+        // As the last step for shaders, set any unset texture slots
+        // with the default textures from the shader is there is any.
         if (!rpass->textures[i] && rpass->shader.textures[i]) {
           rpass->textures[i] = rpass->shader.textures[i];
         }
+        // Set TEX0FORMAT incase extra steps are needed when sampling,
+        // see "common_fragment.h".
+        if (rpass->textures[i] && i == 0) {
+          mri_combo c = {
+            .name = mstr_from("TEX0FORMAT"),
+            .value = rpass->textures[i]->format
+          };       
+          mvec_push(rpass->shader.combos, c);
+        }
       }
 
       mri_uniform *pass_uniform, *shader_uniform;
@@ -183,11 +212,13 @@ void mri_pass_load(mri_engine *engine, mri_pass *pass, mri_pass_stage stage) {
           mstr_cmp(shader_uniform->uname, mstr_c("Resolution"), 10, 10) == 0) {
           int index = shader_uniform->uname->ptr[9] - '0';
           if (rpass->textures[index]) {
-            vec4 *texture_res = &rpass->textures[index]->texture_resolution;
-            memcpy(shader_uniform->value, texture_res, sizeof(vec4));
+            memcpy(shader_uniform->value,
+              &rpass->textures[index]->texture_resolution, sizeof(vec4));
           }
         }
       }
+
+      // Handle uniform value overrides.
       mvec_loop_ptr(rpass->uniforms, pass_uniform, i) 
       mvec_loop_ptr(rpass->shader.uniforms, shader_uniform, s) {
         if (!shader_uniform->name) continue;
@@ -196,6 +227,7 @@ void mri_pass_load(mri_engine *engine, mri_pass *pass, mri_pass_stage stage) {
         }
       }
 
+      // Handle combo value overrides.
       mri_combo *pass_combo, *shader_combo;
       mvec_loop_ptr(rpass->combos, pass_combo, i) 
       mvec_loop_ptr(rpass->shader.combos, shader_combo, s) {
@@ -204,6 +236,7 @@ void mri_pass_load(mri_engine *engine, mri_pass *pass, mri_pass_stage stage) {
         }
       }
 
+      // compile the shader with the new combo values.
       mri_shader_compile(&rpass->shader);
 
       break;
@@ -211,7 +244,37 @@ void mri_pass_load(mri_engine *engine, mri_pass *pass, mri_pass_stage stage) {
   }
 }
 
+void mri_render_pass_draw(mri_engine *engine, mri_render_pass *pass) {
+  mri_framebuffer_bind(pass->target, pass->combine);
+  mri_shader_bind(engine, &pass->shader, pass->model);
+
+  bind_gl_object(pass->gl_object);
+
+  for (int i = 0; i < pass->shader.texture_count; i++) {
+    if (pass->textures[i]) mri_texture_bind(pass->textures[i], i);
+  }
+
+  glViewport(0, 0, pass->target->width, pass->target->height);
+  glDrawArrays(GL_TRIANGLES, 0, 6);
+
+  if (0) {
+    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
+    glBindFramebuffer(GL_READ_FRAMEBUFFER, pass->target->buffer.id);
+
+    // Drawing past the dimensions of the read buffer is an error.
+    glBlitFramebuffer(0, engine->context->height, engine->context->width, 0, 0, 0,
+      engine->context->width, engine->context->height,
+      GL_COLOR_BUFFER_BIT, GL_NEAREST);
+
+    engine->context->swap_buffers(engine->context);
+
+    usleep(1000000);
+  }
+}
+
 void mri_pass_unload(mri_pass *pass) {
+  // TODO render pass unloading
+
   for (int i = 0; i < 7; i++) {
     if (pass->textures[i]) mri_texture_unload(pass->textures[i]);
   }
diff --git a/src/objects/pass.h b/src/objects/pass.h
index 116f91d..37c0997 100644
--- a/src/objects/pass.h
+++ b/src/objects/pass.h
@@ -3,14 +3,32 @@
 
 #include <jansson.h>
 
+#include "src/gl.h"
 #include "types.h"
 
 #include "../context.h"
 #include "../shader.h"
-#include "../engine.h"
 #include "../texture.h"
 
+typedef enum {
+  EFFECT0_PASS,
+  EFFECT1_PASS,
+  MATERIAL_PASS,
+  MATERIAL_ONLY_PASS
+} mri_pass_stage;
+
+typedef enum {
+  BACKGROUND,
+  BACKGROUND_ONLY,
+  TRANSFORM,
+  COMBINE,
+  PASS,
+} mri_render_pass_stage;
+
+
 struct mri_pass {
+  int id;
+
   mri_material *material;
 
   mri_shader *shader;
@@ -23,15 +41,29 @@ struct mri_pass {
   mvec(mri_combo) combos;
 };
 
-typedef enum {
-  EFFECT0_PASS,
-  EFFECT1_PASS,
-  MATERIAL_PASS,
-  MATERIAL_ONLY_PASS
-} mri_pass_stage;
+struct mri_render_pass {
+  mri_shader shader;
+
+  mri_object *object;
+
+  mat4 model;
+  gl_object *gl_object;
+
+  mri_texture *textures[7];
+  mri_framebuffer *target;
+
+  bool combine;
+
+  mri_render_pass_stage stage;
+
+  mvec(mri_uniform) uniforms;
+  mvec(mri_combo) combos;
+};
 
 void mri_pass_parse(mri_pass *pass, json_t *root, mri_pass_stage stage);
-void mri_pass_load(mri_engine *engine, mri_pass *pass, mri_pass_stage stage);
+void mri_pass_load(mri_engine *engine, mri_pass *pass, mri_pass_stage stage, mri_render_pass *rpass);
 void mri_pass_unload(mri_pass *pass);
 
+void mri_render_pass_draw(mri_engine *engine, mri_render_pass *pass);
+
 #endif // _PASS_H
diff --git a/src/objects/scene.c b/src/objects/scene.c
index f887f13..db6656f 100644
--- a/src/objects/scene.c
+++ b/src/objects/scene.c
@@ -6,6 +6,8 @@
 
 #include "../json.h"
 #include "../log.h"
+#include "../engine.h"
+#include "src/objects/types.h"
 
 void mri_scene_parse(mri_scene *scene) {
   mri_asset *scene_asset = mri_asset_manager_get(mstr_c("scene.json"), NONE);
@@ -28,7 +30,7 @@ void mri_scene_parse(mri_scene *scene) {
   json_get_bool(&scene->clear_enabled, general, "clearenabled");
 
   json_get_vec3((vec3 *)&scene->clear_color, general, "clearcolor");
-  scene->clear_color[3] = 1.f;
+  scene->clear_color[3] = 0.f;
 
   json_get_vec3(&scene->ambient_color, general, "ambientcolor");
   json_get_vec3(&scene->skylight_color, general, "skylightcolor");
@@ -43,7 +45,7 @@ void mri_scene_parse(mri_scene *scene) {
   json_array(object, objects) {
     bool visible;
     json_get_bool(&visible, object, "visible");
-    if (visible)
+    if (visible && !(json_is_null(json_object_get(object, "image"))))
       mri_object_parse(mvec_next(scene->objects), object);
   }
 
@@ -80,6 +82,22 @@ void mri_scene_load(mri_engine *engine, mri_scene *scene) {
   }
 }
 
+void mri_scene_draw(mri_engine *engine, mri_scene *scene) {
+  mri_object *object;
+  mvec_loop_ptr(scene->objects, object, i) {
+    int dep;
+    mvec_loop(object->deps, dep, s) {
+      mri_object *dep_object;
+      mvec_loop_ptr(scene->objects, dep_object, j) {
+        if (dep_object->id == dep) {
+          mri_object_draw(engine, dep_object);
+        }
+      }
+    }
+    mri_object_draw(engine, object);
+  }
+}
+
 void mri_scene_unload(mri_scene *scene) {
   mri_object *object;
   mvec_loop_ptr(scene->objects, object, i) {
diff --git a/src/objects/scene.h b/src/objects/scene.h
index dee6d50..9514580 100644
--- a/src/objects/scene.h
+++ b/src/objects/scene.h
@@ -38,8 +38,10 @@ struct mri_scene {
 };
 
 void mri_scene_parse(mri_scene *scene);
-int mri_scene_framebuffer_count(mri_scene *scene);
 void mri_scene_load(mri_engine *engine, mri_scene *scene);
+void mri_scene_draw(mri_engine *engine, mri_scene *scene);
 void mri_scene_unload(mri_scene *scene);
 
+int mri_scene_framebuffer_count(mri_scene *scene);
+
 #endif // _SCENE_H
diff --git a/src/objects/types.h b/src/objects/types.h
index 9701cb0..76fd8eb 100644
--- a/src/objects/types.h
+++ b/src/objects/types.h
@@ -8,4 +8,8 @@ typedef struct mri_material mri_material;
 typedef struct mri_pass     mri_pass;
 typedef struct mri_effect   mri_effect;
 
+typedef struct mri_render_pass   mri_render_pass;
+
+typedef struct mri_engine mri_engine;
+
 #endif // _TYPES_H