triangles_material_generator.cpp

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/*
 * Copyright (c) 2010, Willow Garage, Inc.
 * All rights reserved.
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 * modification, are permitted provided that the following conditions are met:
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 *     * Neither the name of the Willow Garage, Inc. nor the names of its
 *       contributors may be used to endorse or promote products derived from
 *       this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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#include <rve_render_server/batching/triangles_material_generator.h>
#include <rve_render_server/batching/triangles_renderer_desc.h>
#include <rve_render_server/material_definition.h>
#include <rve_render_server/ogre_material_generator.h>
#include <rve_render_server/init.h>
#include <rve_render_server/renderer.h>

#include <rve_msgs/Triangles.h>

#include <sstream>

#include <OGRE/OgreRoot.h>
#include <OGRE/OgreMaterialManager.h>
#include <OGRE/OgreTextureManager.h>
#include <OGRE/OgreTexture.h>
#include <OGRE/OgreGpuProgramManager.h>
#include <OGRE/OgreHighLevelGpuProgramManager.h>
#include <OGRE/OgreTechnique.h>
#include <OGRE/OgrePass.h>

namespace rve_render_server
{

std::string descToStringID(const TrianglesRendererDesc& desc, bool alpha)
{
  std::stringstream ss;
  ss << "GenTriangles_";

  if (alpha)
  {
    ss << "Alpha";
  }

  return ss.str();
}

void fillVertexShaderDefinition(const TrianglesRendererDesc& desc, ShaderDefinition& def)
{
  def.input("float4", "position", "POSITION");
  def.input("float3", "normal", "NORMAL");
  def.input("float4", "color", "COLOR");

  def.output("float4", "position", "POSITION");
  def.output("float4", "color", "COLOR");
  def.output("float3", "view_pos", "TEXCOORD0");
  def.output("float3", "normal", "TEXCOORD1");

  def.uniform("float4", "camera_pos", Ogre::GpuProgramParameters::ACT_CAMERA_POSITION_OBJECT_SPACE, 0);
  def.uniform("float4x4", "worldviewproj", Ogre::GpuProgramParameters::ACT_WORLDVIEWPROJ_MATRIX, 0);
  def.uniform("float4x4", "worldview", Ogre::GpuProgramParameters::ACT_WORLDVIEW_MATRIX, 0);

  std::stringstream ss;

  ss << " float4 pos = in_position;\n";
  ss << " float3 view_dir = worldview._m02_m12_m22;\n";
  ss << " float3 normal = -sign(dot(view_dir, in_normal)) * in_normal;\n";

  ss << " out_position = mul(worldviewproj, pos);\n" << std::endl;
  ss << " out_normal = mul(worldview, float4(normal, 0)).xyz;\n" << std::endl;
  ss << " out_view_pos = mul(worldview, pos).xyz;\n" << std::endl;
  ss << " out_color = in_color;\n";
  def.body = ss.str();
}

void fillFragmentShaderDefinition(const TrianglesRendererDesc& desc, ShaderDefinition& def)
{
  def.input("float4", "color", "COLOR");
  def.input("float3", "view_pos", "TEXCOORD0");
  def.input("float3", "normal", "TEXCOORD1");

  std::stringstream ss;
  ss << " float3 normal = in_normal;" << std::endl;
  ss << " float4 color = in_color;\n";
  def.body = ss.str();
}

std::pair<Ogre::MaterialPtr, Ogre::MaterialPtr> generateMaterialsForTriangles(const TrianglesRendererDesc& desc)
{
  std::string material_name_opaque = descToStringID(desc, false);
  std::string material_name_alpha = descToStringID(desc, true);

  MaterialDefinition mat_def;
  fillVertexShaderDefinition(desc, mat_def.vertex_def);
  fillFragmentShaderDefinition(desc, mat_def.fragment_def);

  mat_def.name = material_name_opaque;
  Ogre::MaterialPtr mat_opaque = generateOgreMaterial(mat_def);
  mat_opaque->setPointSize(5);
  mat_opaque->setCullingMode(Ogre::CULL_NONE);

  mat_def.name = material_name_alpha;
  mat_def.transparent = true;
  Ogre::MaterialPtr mat_alpha = generateOgreMaterial(mat_def);
  mat_alpha->setPointSize(5);
  mat_alpha->setCullingMode(Ogre::CULL_NONE);

  return std::make_pair(mat_opaque, mat_alpha);
}

} // namespace rve_render_server