VideoBackends: Add AbstractShader and AbstractPipeline classes

Source/Core/VideoBackends/OGL/OGLShader.cpp

@@ -0,0 +1,77 @@
+// Copyright 2017 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#include "VideoBackends/OGL/OGLShader.h"
+#include "VideoBackends/OGL/ProgramShaderCache.h"
+
+namespace OGL
+{
+static GLenum GetGLShaderTypeForStage(ShaderStage stage)
+{
+  switch (stage)
+  {
+  case ShaderStage::Vertex:
+    return GL_VERTEX_SHADER;
+  case ShaderStage::Geometry:
+    return GL_GEOMETRY_SHADER;
+  case ShaderStage::Pixel:
+    return GL_FRAGMENT_SHADER;
+  case ShaderStage::Compute:
+    return GL_COMPUTE_SHADER;
+  default:
+    return 0;
+  }
+}
+
+OGLShader::OGLShader(ShaderStage stage, GLenum gl_type, GLuint shader_id)
+    : AbstractShader(stage), m_type(gl_type), m_id(shader_id)
+{
+}
+
+OGLShader::OGLShader(GLuint compute_program_id)
+    : AbstractShader(ShaderStage::Compute), m_type(GL_COMPUTE_SHADER), m_id(compute_program_id)
+{
+}
+
+OGLShader::~OGLShader()
+{
+  if (m_stage != ShaderStage::Compute)
+    glDeleteShader(m_id);
+  else
+    glDeleteProgram(m_compute_program_id);
+}
+
+bool OGLShader::HasBinary() const
+{
+  // NOTE: GL shaders do not have binaries, programs do.
+  return false;
+}
+
+AbstractShader::BinaryData OGLShader::GetBinary() const
+{
+  return {};
+}
+
+std::unique_ptr<OGLShader> OGLShader::CreateFromSource(ShaderStage stage, const char* source,
+                                                       size_t length)
+{
+  if (stage != ShaderStage::Compute)
+  {
+    GLenum shader_type = GetGLShaderTypeForStage(stage);
+    GLuint shader_id =
+        ProgramShaderCache::CompileSingleShader(shader_type, std::string(source, length));
+    if (!shader_id)
+      return nullptr;
+
+    return std::make_unique<OGLShader>(stage, shader_type, shader_id);
+  }
+
+  // Compute shaders.
+  SHADER prog;
+  if (!ProgramShaderCache::CompileComputeShader(prog, std::string(source, length)))
+    return nullptr;
+  return std::make_unique<OGLShader>(prog.glprogid);
+}
+
+}  // namespace OGL