Cycles render engine, initial commit. This is the engine itself, blender modifications and build instructions will follow later.

Cycles uses code from some great open source projects, many thanks them:

* BVH building and traversal code from NVidia's "Understanding the Efficiency of Ray Traversal on GPUs":
http://code.google.com/p/understanding-the-efficiency-of-ray-traversal-on-gpus/
* Open Shading Language for a large part of the shading system:
http://code.google.com/p/openshadinglanguage/
* Blender for procedural textures and a few other nodes.
* Approximate Catmull Clark subdivision from NVidia Mesh tools:
http://code.google.com/p/nvidia-mesh-tools/
* Sobol direction vectors from:
http://web.maths.unsw.edu.au/~fkuo/sobol/
* Film response functions from:
http://www.cs.columbia.edu/CAVE/software/softlib/dorf.php

1 files changed, 280 insertions, 0 deletions

diff --git a/intern/cycles/blender/blender_session.cpp b/intern/cycles/blender/blender_session.cpp
new file mode 100644
index 00000000000..8e8bba4e5b6
--- /dev/null
+++ b/intern/cycles/blender/blender_session.cpp
@@ -0,0 +1,280 @@
+/*
+ * Copyright 2011, Blender Foundation.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#include "background.h"
+#include "buffers.h"
+#include "camera.h"
+#include "device.h"
+#include "integrator.h"
+#include "light.h"
+#include "scene.h"
+#include "session.h"
+#include "shader.h"
+
+#include "util_color.h"
+#include "util_foreach.h"
+#include "util_function.h"
+#include "util_progress.h"
+#include "util_time.h"
+
+#include "blender_sync.h"
+#include "blender_session.h"
+#include "blender_util.h"
+
+CCL_NAMESPACE_BEGIN
+
+BlenderSession::BlenderSession(BL::RenderEngine b_engine_, BL::BlendData b_data_, BL::Scene b_scene_)
+: b_engine(b_engine_), b_data(b_data_), b_scene(b_scene_), b_v3d(PointerRNA_NULL), b_rv3d(PointerRNA_NULL)
+{
+	/* offline render */
+	BL::RenderSettings r = b_scene.render();
+
+	width = (int)(r.resolution_x()*r.resolution_percentage()*0.01f);
+	height = (int)(r.resolution_y()*r.resolution_percentage()*0.01f);
+	background = true;
+	last_redraw_time = 0.0f;
+
+	create_session();
+}
+
+BlenderSession::BlenderSession(BL::RenderEngine b_engine_, BL::BlendData b_data_, BL::Scene b_scene_,
+	BL::SpaceView3D b_v3d_, BL::RegionView3D b_rv3d_, int width_, int height_)
+: b_engine(b_engine_), b_data(b_data_), b_scene(b_scene_), b_v3d(b_v3d_), b_rv3d(b_rv3d_)
+{
+	/* 3d view render */
+	width = width_;
+	height = height_;
+	background = false;
+	last_redraw_time = 0.0f;
+
+	create_session();
+}
+
+BlenderSession::~BlenderSession()
+{
+	free_session();
+}
+
+void BlenderSession::create_session()
+{
+	SceneParams scene_params = BlenderSync::get_scene_params(b_scene);
+	SessionParams session_params = BlenderSync::get_session_params(b_scene, background);
+
+	/* create scene */
+	scene = new Scene(scene_params);
+
+	/* create sync */
+	sync = new BlenderSync(b_data, b_scene, scene, !background);
+	sync->sync_data(b_v3d);
+
+	if(b_rv3d)
+		sync->sync_view(b_v3d, b_rv3d, width, height);
+	else
+		sync->sync_camera(width, height);
+
+	/* create session */
+	session = new Session(session_params);
+	session->scene = scene;
+	session->progress.set_update_callback(function_bind(&BlenderSession::tag_redraw, this));
+	session->progress.set_cancel_callback(function_bind(&BlenderSession::test_cancel, this));
+
+	/* start rendering */
+	session->reset(width, height);
+	session->start();
+}
+
+void BlenderSession::free_session()
+{
+	delete sync;
+	delete session;
+}
+
+void BlenderSession::render()
+{
+	session->wait();
+
+	if(session->progress.get_cancel())
+		return;
+
+	/* write result */
+	write_render_result();
+}
+
+void BlenderSession::write_render_result()
+{
+	/* get result */
+	DisplayBuffer *display = session->display;
+	Device *device = session->device;
+
+	if(!display->rgba.device_pointer)
+		return;
+
+	/* todo: get float buffer */
+	device->pixels_copy_from(display->rgba, 0, width, height);
+	uchar4 *rgba = (uchar4*)display->rgba.data_pointer;
+
+	vector<float4> buffer(width*height);
+	float fac = 1.0f/255.0f;
+
+	/* normalize */
+	for(int i = width*height - 1; i >= 0; i--) {
+		uchar4 f = rgba[i];
+		float r = color_srgb_to_scene_linear(f.x*fac);
+		float g = color_srgb_to_scene_linear(f.y*fac);
+		float b = color_srgb_to_scene_linear(f.z*fac);
+		buffer[i] = make_float4(r, g, b, 1.0f);
+	}
+
+	struct RenderResult *rrp = RE_engine_begin_result((RenderEngine*)b_engine.ptr.data, 0, 0, width, height);
+	PointerRNA rrptr;
+	RNA_pointer_create(NULL, &RNA_RenderResult, rrp, &rrptr);
+	BL::RenderResult rr(rrptr);
+
+	rna_RenderLayer_rect_set(&rr.layers.begin()->ptr, (float*)&buffer[0]);
+
+	RE_engine_end_result((RenderEngine*)b_engine.ptr.data, rrp);
+}
+
+void BlenderSession::synchronize()
+{
+	/* on session/scene parameter changes, we recreate session entirely */
+	SceneParams scene_params = BlenderSync::get_scene_params(b_scene);
+	SessionParams session_params = BlenderSync::get_session_params(b_scene, background);
+
+	if(session->params.modified(session_params) ||
+	   scene->params.modified(scene_params)) {
+		free_session();
+		create_session();
+		return;
+	}
+
+	/* copy recalc flags, outside of mutex so we can decide to do the real
+	   synchronization at a later time to not block on running updates */
+	sync->sync_recalc();
+
+	/* try to acquire mutex. if we don't want to or can't, come back later */
+	if(!session->ready_to_reset() || !session->scene->mutex.try_lock()) {
+		tag_update();
+		return;
+	}
+
+	/* data and camera synchronize */
+	sync->sync_data(b_v3d);
+
+	if(b_rv3d)
+		sync->sync_view(b_v3d, b_rv3d, width, height);
+	else
+		sync->sync_camera(width, height);
+
+	/* reset if needed */
+	if(scene->need_reset())
+		session->reset(width, height);
+
+	/* unlock */
+	session->scene->mutex.unlock();
+}
+
+bool BlenderSession::draw(int w, int h)
+{
+	/* before drawing, we verify camera and viewport size changes, because
+	   we do not get update callbacks for those, we must detect them here */
+	if(session->ready_to_reset()) {
+		bool reset = false;
+
+		/* try to acquire mutex. if we can't, come back later */
+		if(!session->scene->mutex.try_lock()) {
+			tag_update();
+		}
+		else {
+			/* update camera from 3d view */
+			bool need_update = scene->camera->need_update;
+
+			sync->sync_view(b_v3d, b_rv3d, w, h);
+
+			if(scene->camera->need_update && !need_update)
+				reset = true;
+
+			session->scene->mutex.unlock();
+		}
+
+		/* if dimensions changed, reset */
+		if(width != w || height != h) {
+			width = w;
+			height = h;
+			reset = true;
+		}
+
+		/* reset if requested */
+		if(reset)
+			session->reset(width, height);
+	}
+
+	/* draw */
+	return !session->draw(width, height);
+}
+
+bool BlenderSession::draw()
+{
+	return !session->draw(width, height);
+}
+
+void BlenderSession::get_status(string& status, string& substatus)
+{
+	session->progress.get_status(status, substatus);
+}
+
+void BlenderSession::tag_update()
+{
+	/* tell blender that we want to get another update callback */
+	engine_tag_update((RenderEngine*)b_engine.ptr.data);
+}
+
+void BlenderSession::tag_redraw()
+{
+	if(background) {
+		/* offline render, set stats and redraw if timeout passed */
+		string status, substatus;
+		get_status(status, substatus);
+
+		if(substatus.size() > 0)
+			status += " | " + substatus;
+
+		RE_engine_update_stats((RenderEngine*)b_engine.ptr.data, "", status.c_str());
+
+		if(time_dt() - last_redraw_time > 1.0f) {
+			write_render_result();
+			engine_tag_redraw((RenderEngine*)b_engine.ptr.data);
+			last_redraw_time = time_dt();
+		}
+	}
+	else {
+		/* tell blender that we want to redraw */
+		engine_tag_redraw((RenderEngine*)b_engine.ptr.data);
+	}
+}
+
+void BlenderSession::test_cancel()
+{
+	/* test if we need to cancel rendering */
+	if(background)
+		if(RE_engine_test_break((RenderEngine*)b_engine.ptr.data))
+			session->progress.set_cancel("Cancelled");
+}
+
+CCL_NAMESPACE_END
+