sync with upstream

1 files changed, 571 insertions, 0 deletions

diff --git a/xbmc/addons/kodi-dev-kit/include/kodi/gui/gl/Shader.h b/xbmc/addons/kodi-dev-kit/include/kodi/gui/gl/Shader.h
new file mode 100644
index 0000000..bf6d48c
--- /dev/null
+++ b/xbmc/addons/kodi-dev-kit/include/kodi/gui/gl/Shader.h
@@ -0,0 +1,571 @@
+/*
+ *  Copyright (C) 2005-2019 Team Kodi
+ *  This file is part of Kodi - https://kodi.tv
+ *
+ *  SPDX-License-Identifier: GPL-2.0-or-later
+ *  See LICENSES/README.md for more information.
+ */
+
+#pragma once
+
+#include "GL.h"
+
+#ifdef __cplusplus
+
+#include <stdio.h>
+#include <string>
+#include <vector>
+
+#include <kodi/AddonBase.h>
+#include <kodi/Filesystem.h>
+
+#define LOG_SIZE 1024
+#define GLchar char
+
+namespace kodi
+{
+namespace gui
+{
+namespace gl
+{
+
+//========================================================================
+/// CShader - base class
+class ATTRIBUTE_HIDDEN CShader
+{
+public:
+  CShader() = default;
+  virtual ~CShader() = default;
+  virtual bool Compile(const std::string& extraBegin = "", const std::string& extraEnd = "") = 0;
+  virtual void Free() = 0;
+  virtual GLuint Handle() = 0;
+
+  bool LoadSource(const std::string& file)
+  {
+    char buffer[16384];
+
+    kodi::vfs::CFile source;
+    if (!source.OpenFile(file))
+    {
+      kodi::Log(ADDON_LOG_ERROR, "CShader::%s: Failed to open file '%s'", __FUNCTION__,
+                file.c_str());
+      return false;
+    }
+    size_t len = source.Read(buffer, sizeof(buffer));
+    m_source.assign(buffer);
+    m_source[len] = 0;
+    source.Close();
+    return true;
+  }
+
+  bool OK() const { return m_compiled; }
+
+protected:
+  std::string m_source;
+  std::string m_lastLog;
+  bool m_compiled = false;
+};
+//------------------------------------------------------------------------
+
+//========================================================================
+/// CVertexShader
+class ATTRIBUTE_HIDDEN CVertexShader : public CShader
+{
+public:
+  CVertexShader() = default;
+  ~CVertexShader() override { Free(); }
+
+  void Free() override
+  {
+    if (m_vertexShader)
+      glDeleteShader(m_vertexShader);
+    m_vertexShader = 0;
+  }
+
+  bool Compile(const std::string& extraBegin = "", const std::string& extraEnd = "") override
+  {
+    GLint params[4];
+
+    Free();
+
+    m_vertexShader = glCreateShader(GL_VERTEX_SHADER);
+
+    GLsizei count = 0;
+    const char* sources[3];
+    if (!extraBegin.empty())
+      sources[count++] = extraBegin.c_str();
+    if (!m_source.empty())
+      sources[count++] = m_source.c_str();
+    if (!extraEnd.empty())
+      sources[count++] = extraEnd.c_str();
+
+    glShaderSource(m_vertexShader, count, sources, nullptr);
+    glCompileShader(m_vertexShader);
+    glGetShaderiv(m_vertexShader, GL_COMPILE_STATUS, params);
+    if (params[0] != GL_TRUE)
+    {
+      GLchar log[LOG_SIZE];
+      glGetShaderInfoLog(m_vertexShader, LOG_SIZE, nullptr, log);
+      kodi::Log(ADDON_LOG_ERROR, "CVertexShader::%s: %s", __FUNCTION__, log);
+      fprintf(stderr, "CVertexShader::%s: %s\n", __FUNCTION__, log);
+      m_lastLog = log;
+      m_compiled = false;
+    }
+    else
+    {
+      GLchar log[LOG_SIZE];
+      glGetShaderInfoLog(m_vertexShader, LOG_SIZE, nullptr, log);
+      m_lastLog = log;
+      m_compiled = true;
+    }
+    return m_compiled;
+  }
+
+  GLuint Handle() override { return m_vertexShader; }
+
+protected:
+  GLuint m_vertexShader = 0;
+};
+//------------------------------------------------------------------------
+
+//========================================================================
+/// CPixelShader
+class ATTRIBUTE_HIDDEN CPixelShader : public CShader
+{
+public:
+  CPixelShader() = default;
+  ~CPixelShader() { Free(); }
+  void Free() override
+  {
+    if (m_pixelShader)
+      glDeleteShader(m_pixelShader);
+    m_pixelShader = 0;
+  }
+
+  bool Compile(const std::string& extraBegin = "", const std::string& extraEnd = "") override
+  {
+    GLint params[4];
+
+    Free();
+
+    m_pixelShader = glCreateShader(GL_FRAGMENT_SHADER);
+
+    GLsizei count = 0;
+    const char* sources[3];
+    if (!extraBegin.empty())
+      sources[count++] = extraBegin.c_str();
+    if (!m_source.empty())
+      sources[count++] = m_source.c_str();
+    if (!extraEnd.empty())
+      sources[count++] = extraEnd.c_str();
+
+    glShaderSource(m_pixelShader, count, sources, 0);
+    glCompileShader(m_pixelShader);
+    glGetShaderiv(m_pixelShader, GL_COMPILE_STATUS, params);
+    if (params[0] != GL_TRUE)
+    {
+      GLchar log[LOG_SIZE];
+      glGetShaderInfoLog(m_pixelShader, LOG_SIZE, nullptr, log);
+      kodi::Log(ADDON_LOG_ERROR, "CPixelShader::%s: %s", __FUNCTION__, log);
+      fprintf(stderr, "CPixelShader::%s: %s\n", __FUNCTION__, log);
+      m_lastLog = log;
+      m_compiled = false;
+    }
+    else
+    {
+      GLchar log[LOG_SIZE];
+      glGetShaderInfoLog(m_pixelShader, LOG_SIZE, nullptr, log);
+      m_lastLog = log;
+      m_compiled = true;
+    }
+    return m_compiled;
+  }
+
+  GLuint Handle() override { return m_pixelShader; }
+
+protected:
+  GLuint m_pixelShader = 0;
+};
+//------------------------------------------------------------------------
+
+//============================================================================
+/// @defgroup cpp_kodi_gui_helpers_gl_CShaderProgram GL Shader Program
+/// @ingroup cpp_kodi_gui_helpers_gl
+/// @brief @cpp_class{ kodi::gui::gl::CShaderProgram }
+/// **Class to manage an OpenGL shader program**\n
+/// With this class the used GL shader code can be defined on the GPU and
+/// its variables can be managed between CPU and GPU.
+///
+/// It has the header @ref Shader.h "#include <kodi/gui/gl/Shader.h>"
+/// be included to enjoy it.
+///
+/// ----------------------------------------------------------------------------
+///
+/// <b>Example:</b>
+///
+/// ~~~~~~~~~~~~~{.cpp}
+///
+/// #include <kodi/gui/gl/Shader.h>
+/// ...
+///
+/// class ATTRIBUTE_HIDDEN CExample
+///   : ...,
+///     public kodi::gui::gl::CShaderProgram
+/// {
+/// public:
+///   CExample() = default;
+///
+///   bool Start();
+///   void Render();
+///
+///   // override functions for kodi::gui::gl::CShaderProgram
+///   void OnCompiledAndLinked() override;
+///   bool OnEnabled() override;
+///
+/// private:
+///   ...
+///   GLint m_aPosition = -1;
+///   GLint m_aColor = -1;
+/// };
+///
+/// bool CExample::Start()
+/// {
+///   // Define shaders and load
+///   std::string fraqShader = kodi::GetAddonPath("resources/shaders/" GL_TYPE_STRING "/glsl.frag");
+///   std::string vertShader = kodi::GetAddonPath("resources/shaders/" GL_TYPE_STRING "/glsl.vert");
+///   if (!LoadShaderFiles(vertShader, fraqShader) || !CompileAndLink())
+///     return false;
+///
+///   ...
+///   return true;
+/// }
+///
+/// ...
+///
+/// void CExample::Render()
+/// {
+///   ...
+///
+///   EnableShader();
+///   ...
+///   DO WORK
+///   ...
+///   DisableShader();
+/// }
+///
+/// void CExample::OnCompiledAndLinked()
+/// {
+///   ...
+///   DO YOUR WORK HERE FOR WHAT IS ONE TIME REQUIRED DURING COMPILE OF SHADER, E.G.:
+///
+///   m_aPosition = glGetAttribLocation(ProgramHandle(), "a_position");
+///   m_aColor = glGetAttribLocation(ProgramHandle(), "a_color");
+/// }
+///
+/// bool OnEnabled() override
+/// {
+///   ...
+///   DO YOUR WORK HERE FOR WHAT REQUIRED DURING ENABLE OF SHADER
+///   ...
+///   return true;
+/// }
+///
+/// ADDONCREATOR(CExample);
+/// ~~~~~~~~~~~~~
+///
+class ATTRIBUTE_HIDDEN CShaderProgram
+{
+public:
+  //==========================================================================
+  /// @ingroup cpp_kodi_gui_helpers_gl_CShaderProgram
+  /// @brief Construct a new shader.
+  ///
+  /// Load must be done later with @ref LoadShaderFiles.
+  ///
+  CShaderProgram() = default;
+  //--------------------------------------------------------------------------
+
+  //==========================================================================
+  /// @ingroup cpp_kodi_gui_helpers_gl_CShaderProgram
+  /// @brief Construct a new shader and load defined shader files.
+  ///
+  /// @param[in] vert Path to used GL vertext shader
+  /// @param[in] frag Path to used GL fragment shader
+  ///
+  CShaderProgram(const std::string& vert, const std::string& frag) { LoadShaderFiles(vert, frag); }
+  //--------------------------------------------------------------------------
+
+  //==========================================================================
+  /// @ingroup cpp_kodi_gui_helpers_gl_CShaderProgram
+  /// @brief Destructor.
+  ///
+  virtual ~CShaderProgram() { ShaderFree(); }
+  //--------------------------------------------------------------------------
+
+  //==========================================================================
+  /// @ingroup cpp_kodi_gui_helpers_gl_CShaderProgram
+  /// @brief To load manually the needed shader files.
+  ///
+  /// @param[in] vert Path to used GL vertext shader
+  /// @param[in] frag Path to used GL fragment shader
+  ///
+  ///
+  /// @note The use of the files is optional, but it must either be passed over
+  /// here or via @ref CompileAndLink, or both of the source code.
+  ///
+  bool LoadShaderFiles(const std::string& vert, const std::string& frag)
+  {
+    if (!kodi::vfs::FileExists(vert) || !m_pVP.LoadSource(vert))
+    {
+      kodi::Log(ADDON_LOG_ERROR, "%s: Failed to load '%s'", __func__, vert.c_str());
+      return false;
+    }
+
+    if (!kodi::vfs::FileExists(frag) || !m_pFP.LoadSource(frag))
+    {
+      kodi::Log(ADDON_LOG_ERROR, "%s: Failed to load '%s'", __func__, frag.c_str());
+      return false;
+    }
+
+    return true;
+  }
+  //--------------------------------------------------------------------------
+
+  //==========================================================================
+  /// @ingroup cpp_kodi_gui_helpers_gl_CShaderProgram
+  /// @brief To compile and link the shader to the GL interface.
+  ///
+  /// Optionally, additional source code can be transferred here, or it can be
+  /// used independently without any files
+  ///
+  /// @param[in] vertexExtraBegin   [opt] To additionally add vextex source
+  ///                               code to the beginning of the loaded file
+  ///                               source code
+  /// @param[in] vertexExtraEnd     [opt] To additionally add vextex source
+  ///                               code to the end of the loaded file
+  ///                               source code
+  /// @param[in] fragmentExtraBegin [opt] To additionally add fragment source
+  ///                               code to the beginning of the loaded file
+  ///                               source code
+  /// @param[in] fragmentExtraEnd   [opt] To additionally add fragment source
+  ///                               code to the end of the loaded file
+  ///                               source code
+  /// @return                       true if compile was successed
+  ///
+  ///
+  /// @note In the case of a compile error, it will be written once into the Kodi
+  /// log and in addition to the console output to quickly detect the errors when
+  /// writing the damage.
+  ///
+  ///
+  bool CompileAndLink(const std::string& vertexExtraBegin = "",
+                      const std::string& vertexExtraEnd = "",
+                      const std::string& fragmentExtraBegin = "",
+                      const std::string& fragmentExtraEnd = "")
+  {
+    GLint params[4];
+
+    // free resources
+    ShaderFree();
+    m_ok = false;
+
+    // compiled vertex shader
+    if (!m_pVP.Compile(vertexExtraBegin, vertexExtraEnd))
+    {
+      kodi::Log(ADDON_LOG_ERROR, "GL: Error compiling vertex shader");
+      return false;
+    }
+
+    // compile pixel shader
+    if (!m_pFP.Compile(fragmentExtraBegin, fragmentExtraEnd))
+    {
+      m_pVP.Free();
+      kodi::Log(ADDON_LOG_ERROR, "GL: Error compiling fragment shader");
+      return false;
+    }
+
+    // create program object
+    m_shaderProgram = glCreateProgram();
+    if (!m_shaderProgram)
+    {
+      kodi::Log(ADDON_LOG_ERROR, "CShaderProgram::%s: Failed to create GL program", __FUNCTION__);
+      ShaderFree();
+      return false;
+    }
+
+    // attach the vertex shader
+    glAttachShader(m_shaderProgram, m_pVP.Handle());
+    glAttachShader(m_shaderProgram, m_pFP.Handle());
+
+    // link the program
+    glLinkProgram(m_shaderProgram);
+    glGetProgramiv(m_shaderProgram, GL_LINK_STATUS, params);
+    if (params[0] != GL_TRUE)
+    {
+      GLchar log[LOG_SIZE];
+      glGetProgramInfoLog(m_shaderProgram, LOG_SIZE, nullptr, log);
+      kodi::Log(ADDON_LOG_ERROR, "CShaderProgram::%s: %s", __FUNCTION__, log);
+      fprintf(stderr, "CShaderProgram::%s: %s@n", __FUNCTION__, log);
+      ShaderFree();
+      return false;
+    }
+
+    m_validated = false;
+    m_ok = true;
+    OnCompiledAndLinked();
+    return true;
+  }
+  //--------------------------------------------------------------------------
+
+  //==========================================================================
+  /// @ingroup cpp_kodi_gui_helpers_gl_CShaderProgram
+  /// @brief To activate the shader and use it on the GPU.
+  ///
+  /// @return true if enable was successfull done
+  ///
+  ///
+  /// @note During this call, the @ref OnEnabled stored in the child is also
+  /// called
+  ///
+  bool EnableShader()
+  {
+    if (ShaderOK())
+    {
+      glUseProgram(m_shaderProgram);
+      if (OnEnabled())
+      {
+        if (!m_validated)
+        {
+          // validate the program
+          GLint params[4];
+          glValidateProgram(m_shaderProgram);
+          glGetProgramiv(m_shaderProgram, GL_VALIDATE_STATUS, params);
+          if (params[0] != GL_TRUE)
+          {
+            GLchar log[LOG_SIZE];
+            glGetProgramInfoLog(m_shaderProgram, LOG_SIZE, nullptr, log);
+            kodi::Log(ADDON_LOG_ERROR, "CShaderProgram::%s: %s", __FUNCTION__, log);
+            fprintf(stderr, "CShaderProgram::%s: %s\n", __FUNCTION__, log);
+          }
+          m_validated = true;
+        }
+        return true;
+      }
+      else
+      {
+        glUseProgram(0);
+        return false;
+      }
+      return true;
+    }
+    return false;
+  }
+  //--------------------------------------------------------------------------
+
+  //==========================================================================
+  /// @ingroup cpp_kodi_gui_helpers_gl_CShaderProgram
+  /// @brief To deactivate the shader use on the GPU.
+  ///
+  void DisableShader()
+  {
+    if (ShaderOK())
+    {
+      glUseProgram(0);
+      OnDisabled();
+    }
+  }
+  //--------------------------------------------------------------------------
+
+  //==========================================================================
+  /// @ingroup cpp_kodi_gui_helpers_gl_CShaderProgram
+  /// @brief Used to check if shader has been loaded before.
+  ///
+  /// @return true if enable was successfull done
+  ///
+  /// @note The CompileAndLink call sets these values
+  ///
+  ATTRIBUTE_FORCEINLINE bool ShaderOK() const { return m_ok; }
+  //--------------------------------------------------------------------------
+
+  //==========================================================================
+  /// @ingroup cpp_kodi_gui_helpers_gl_CShaderProgram
+  /// @brief To get the vertex shader class used by Kodi at the addon.
+  ///
+  /// @return pointer to vertex shader class
+  ///
+  ATTRIBUTE_FORCEINLINE CVertexShader& VertexShader() { return m_pVP; }
+  //--------------------------------------------------------------------------
+
+  //==========================================================================
+  /// @ingroup cpp_kodi_gui_helpers_gl_CShaderProgram
+  /// @brief To get the fragment shader class used by Kodi at the addon.
+  ///
+  /// @return pointer to fragment shader class
+  ///
+  ATTRIBUTE_FORCEINLINE CPixelShader& PixelShader() { return m_pFP; }
+  //--------------------------------------------------------------------------
+
+  //==========================================================================
+  /// @ingroup cpp_kodi_gui_helpers_gl_CShaderProgram
+  /// @brief Used to get the definition created in the OpenGL itself.
+  ///
+  /// @return GLuint of GL shader program handler
+  ///
+  ATTRIBUTE_FORCEINLINE GLuint ProgramHandle() { return m_shaderProgram; }
+  //--------------------------------------------------------------------------
+
+  //==========================================================================
+  /// @defgroup cpp_kodi_gui_helpers_gl_CShaderProgram_child Child Functions
+  /// @ingroup cpp_kodi_gui_helpers_gl_CShaderProgram
+  /// @brief @cpp_class{ kodi::gui::gl::CShaderProgram child functions }
+  ///
+  /// Functions that are added by parent in the child
+  /// @{
+  //==========================================================================
+  ///
+  /// @ingroup cpp_kodi_gui_helpers_gl_CShaderProgram_child
+  /// @brief Mandatory child function to set the necessary CPU to GPU data
+  ///
+  virtual void OnCompiledAndLinked(){};
+  //--------------------------------------------------------------------------
+
+  //==========================================================================
+  /// @ingroup cpp_kodi_gui_helpers_gl_CShaderProgram_child
+  /// @brief Optional function to exchange data between CPU and GPU while
+  /// activating the shader
+  ///
+  /// @return true if enable was successfull done
+  ///
+  virtual bool OnEnabled() { return true; };
+  //--------------------------------------------------------------------------
+
+  //==========================================================================
+  /// @ingroup cpp_kodi_gui_helpers_gl_CShaderProgram_child
+  /// @brief Optional child function that may have to be performed when
+  /// switching off the shader
+  virtual void OnDisabled(){};
+  //--------------------------------------------------------------------------
+  /// @}
+
+private:
+  void ShaderFree()
+  {
+    if (m_shaderProgram)
+      glDeleteProgram(m_shaderProgram);
+    m_shaderProgram = 0;
+    m_ok = false;
+  }
+
+  CVertexShader m_pVP;
+  CPixelShader m_pFP;
+  GLuint m_shaderProgram = 0;
+  bool m_ok = false;
+  bool m_validated = false;
+};
+//------------------------------------------------------------------------
+
+} /* namespace gl */
+} /* namespace gui */
+} /* namespace kodi */
+
+#endif /* __cplusplus */