From 290ac3489b6074d185fbd8ac7c0a79aedb7fa8c1 Mon Sep 17 00:00:00 2001
From: Elderme <talsi.elderme@gmail.com>
Date: Mon, 4 Jan 2016 22:19:19 +0100
Subject: [PATCH] Added render to texture support for legacy OpenGL (but
 rendering with legacy GL is currently bugged)

---
 src/graphics/fixed_pipeline_renderer.cpp    |  6 +---
 src/graphics/irr_driver.cpp                 |  1 +
 src/graphics/render_target.cpp              | 40 +++++++++++++++++++--
 src/graphics/render_target.hpp              |  6 +++-
 src/guiengine/widgets/model_view_widget.cpp |  3 --
 src/tracks/quad_graph.cpp                   |  3 --
 6 files changed, 45 insertions(+), 14 deletions(-)

diff --git a/src/graphics/fixed_pipeline_renderer.cpp b/src/graphics/fixed_pipeline_renderer.cpp
index 9798b30b0..d73862d59 100644
--- a/src/graphics/fixed_pipeline_renderer.cpp
+++ b/src/graphics/fixed_pipeline_renderer.cpp
@@ -110,10 +110,6 @@ void FixedPipelineRenderer::render(float dt)
 std::unique_ptr<RenderTarget> FixedPipelineRenderer::createRenderTarget(const irr::core::dimension2du &dimension,
                                                                         const std::string &name)
 {
-    /*GL1RenderTarget *render_target = new GL1RenderTarget(dimension, name);
-    if (m_render_targets.find("name") != m_render_targets.end())
-        delete m_render_targets[name];
-    m_render_targets[name] = render_target;
-    return render_target;*/
+    return std::unique_ptr<RenderTarget>(new GL1RenderTarget(dimension, name));
 }
 
diff --git a/src/graphics/irr_driver.cpp b/src/graphics/irr_driver.cpp
index aebc5abcf..df13d9bd6 100644
--- a/src/graphics/irr_driver.cpp
+++ b/src/graphics/irr_driver.cpp
@@ -160,6 +160,7 @@ IrrDriver::~IrrDriver()
         Shaders::destroy();
     }
     delete m_wind;
+    delete m_renderer;
 }   // ~IrrDriver
 
 // ----------------------------------------------------------------------------
diff --git a/src/graphics/render_target.cpp b/src/graphics/render_target.cpp
index b4de73800..4e6fc8c82 100644
--- a/src/graphics/render_target.cpp
+++ b/src/graphics/render_target.cpp
@@ -25,7 +25,16 @@
 GL1RenderTarget::GL1RenderTarget(const irr::core::dimension2du &dimension,
                                  const std::string &name)
 {
-    
+    m_render_target_texture =
+        irr_driver->getVideoDriver()->addRenderTargetTexture(dimension,
+                                                             name.c_str(),
+                                                             video::ECF_A8R8G8B8);
+    if (m_render_target_texture != NULL)
+    {
+        irr_driver->getVideoDriver()->setRenderTarget(m_render_target_texture);
+    }
+
+    m_rtt_main_node = NULL;
 }
 
 GL1RenderTarget::~GL1RenderTarget()
@@ -44,7 +53,34 @@ irr::core::dimension2du GL1RenderTarget::getTextureSize() const
 //-----------------------------------------------------------------------------
 void GL1RenderTarget::renderToTexture(irr::scene::ICameraSceneNode* camera, float dt)
 {
-    
+    // m_render_target_texture will be NULL if RTT doesn't work on this computer
+    if (m_render_target_texture == NULL)
+    {
+        Log::error("GL1RenderTarget", "Cannot render to texture.");
+        return;
+    }
+
+    irr_driver->getVideoDriver()->setRenderTarget(m_render_target_texture);
+
+    irr::video::SOverrideMaterial &overridemat = irr_driver->getVideoDriver()->getOverrideMaterial();
+    overridemat.EnablePasses = scene::ESNRP_SOLID;
+    overridemat.EnableFlags = video::EMF_MATERIAL_TYPE;
+    overridemat.Material.MaterialType = video::EMT_SOLID;
+
+    if (m_rtt_main_node == NULL)
+    {
+        irr_driver->getSceneManager()->drawAll();
+    }
+    else
+    {
+        m_rtt_main_node->setVisible(true);
+        irr_driver->getSceneManager()->drawAll();
+        m_rtt_main_node->setVisible(false);
+    }
+
+    overridemat.EnablePasses = 0;
+
+    irr_driver->getVideoDriver()->setRenderTarget(0, false, false);
 }
 
 //-----------------------------------------------------------------------------
diff --git a/src/graphics/render_target.hpp b/src/graphics/render_target.hpp
index fa1e6feb3..5a00453f6 100644
--- a/src/graphics/render_target.hpp
+++ b/src/graphics/render_target.hpp
@@ -41,8 +41,12 @@ public:
 class GL1RenderTarget: public RenderTarget
 {
 private:
-    irr::video::ITexture *m_render_target_texture;
+    /** A pointer to texture on which a scene is rendered. Only used
+     *  in between beginRenderToTexture() and endRenderToTexture calls. */
+    irr::video::ITexture            *m_render_target_texture;
     
+    /** Main node of the RTT scene */
+    irr::scene::ISceneNode          *m_rtt_main_node;
     
 public:
     GL1RenderTarget(const irr::core::dimension2du &dimension,
diff --git a/src/guiengine/widgets/model_view_widget.cpp b/src/guiengine/widgets/model_view_widget.cpp
index 954604195..743b8ae41 100644
--- a/src/guiengine/widgets/model_view_widget.cpp
+++ b/src/guiengine/widgets/model_view_widget.cpp
@@ -154,9 +154,6 @@ void ModelViewWidget::update(float delta)
         // stop rotating when target reached
         if (fabsf(angle - m_rotation_target) < 2.0f) m_rotation_mode = ROTATE_OFF;
     }
-    
-    if (!CVS->isGLSL())
-        return;
 
     if (m_render_target == NULL)
     {
diff --git a/src/tracks/quad_graph.cpp b/src/tracks/quad_graph.cpp
index 483711cb1..029c8a388 100644
--- a/src/tracks/quad_graph.cpp
+++ b/src/tracks/quad_graph.cpp
@@ -73,9 +73,6 @@ QuadGraph::~QuadGraph()
     }
     if(UserConfigParams::m_track_debug)
         cleanupDebugMesh();
-    //if (m_render_target != NULL)
-    //    delete m_render_target;
-    //irr_driver->removeRenderTarget(name); //TODO
 }   // ~QuadGraph
 
 // -----------------------------------------------------------------------------