Merge pull request #3062 from phire/moveGL

Move GL interface code out of the OpenGL video backend.

1 files changed, 135 insertions, 0 deletions

diff --git a/Source/Core/Common/GL/GLUtil.cpp b/Source/Core/Common/GL/GLUtil.cpp
new file mode 100644
index 0000000000..3cb8499b0d
--- /dev/null
+++ b/Source/Core/Common/GL/GLUtil.cpp
@@ -0,0 +1,135 @@
+// Copyright 2008 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#include "Common/GL/GLInterfaceBase.h"
+#include "Common/GL/GLUtil.h"
+#include "Common/Logging/Log.h"
+
+cInterfaceBase *GLInterface;
+static GLuint attributelessVAO = 0;
+static GLuint attributelessVBO = 0;
+
+void InitInterface()
+{
+	GLInterface = HostGL_CreateGLInterface();
+}
+
+GLuint OpenGL_CompileProgram(const char* vertexShader, const char* fragmentShader)
+{
+	// generate objects
+	GLuint vertexShaderID = glCreateShader(GL_VERTEX_SHADER);
+	GLuint fragmentShaderID = glCreateShader(GL_FRAGMENT_SHADER);
+	GLuint programID = glCreateProgram();
+
+	// compile vertex shader
+	glShaderSource(vertexShaderID, 1, &vertexShader, nullptr);
+	glCompileShader(vertexShaderID);
+#if defined(_DEBUG) || defined(DEBUGFAST) || defined(DEBUG_GLSL)
+	GLint Result = GL_FALSE;
+	char stringBuffer[1024];
+	GLsizei stringBufferUsage = 0;
+	glGetShaderiv(vertexShaderID, GL_COMPILE_STATUS, &Result);
+	glGetShaderInfoLog(vertexShaderID, 1024, &stringBufferUsage, stringBuffer);
+
+	if (Result && stringBufferUsage)
+	{
+		ERROR_LOG(VIDEO, "GLSL vertex shader warnings:\n%s%s", stringBuffer, vertexShader);
+	}
+	else if (!Result)
+	{
+		ERROR_LOG(VIDEO, "GLSL vertex shader error:\n%s%s", stringBuffer, vertexShader);
+	}
+	else
+	{
+		DEBUG_LOG(VIDEO, "GLSL vertex shader compiled:\n%s", vertexShader);
+	}
+
+	bool shader_errors = !Result;
+#endif
+
+	// compile fragment shader
+	glShaderSource(fragmentShaderID, 1, &fragmentShader, nullptr);
+	glCompileShader(fragmentShaderID);
+#if defined(_DEBUG) || defined(DEBUGFAST) || defined(DEBUG_GLSL)
+	glGetShaderiv(fragmentShaderID, GL_COMPILE_STATUS, &Result);
+	glGetShaderInfoLog(fragmentShaderID, 1024, &stringBufferUsage, stringBuffer);
+
+	if (Result && stringBufferUsage)
+	{
+		ERROR_LOG(VIDEO, "GLSL fragment shader warnings:\n%s%s", stringBuffer, fragmentShader);
+	}
+	else if (!Result)
+	{
+		ERROR_LOG(VIDEO, "GLSL fragment shader error:\n%s%s", stringBuffer, fragmentShader);
+	}
+	else
+	{
+		DEBUG_LOG(VIDEO, "GLSL fragment shader compiled:\n%s", fragmentShader);
+	}
+
+	shader_errors |= !Result;
+#endif
+
+	// link them
+	glAttachShader(programID, vertexShaderID);
+	glAttachShader(programID, fragmentShaderID);
+	glLinkProgram(programID);
+#if defined(_DEBUG) || defined(DEBUGFAST) || defined(DEBUG_GLSL)
+	glGetProgramiv(programID, GL_LINK_STATUS, &Result);
+	glGetProgramInfoLog(programID, 1024, &stringBufferUsage, stringBuffer);
+
+	if (Result && stringBufferUsage)
+	{
+		ERROR_LOG(VIDEO, "GLSL linker warnings:\n%s%s%s", stringBuffer, vertexShader, fragmentShader);
+	}
+	else if (!Result && !shader_errors)
+	{
+		ERROR_LOG(VIDEO, "GLSL linker error:\n%s%s%s", stringBuffer, vertexShader, fragmentShader);
+	}
+#endif
+
+	// cleanup
+	glDeleteShader(vertexShaderID);
+	glDeleteShader(fragmentShaderID);
+
+	return programID;
+}
+
+void OpenGL_CreateAttributelessVAO()
+{
+	glGenVertexArrays(1, &attributelessVAO);
+	_dbg_assert_msg_(VIDEO, attributelessVAO != 0, "Attributeless VAO should have been created successfully.")
+
+	// In a compatibility context, we require a valid, bound array buffer.
+	glGenBuffers(1, &attributelessVBO);
+	_dbg_assert_msg_(VIDEO, attributelessVBO != 0, "Attributeless VBO should have been created successfully.")
+
+	// Initialize the buffer with nothing.  16 floats is an arbitrary size that may work around driver issues.
+	glBindBuffer(GL_ARRAY_BUFFER, attributelessVBO);
+	glBufferData(GL_ARRAY_BUFFER, sizeof(GLfloat) * 16, nullptr, GL_STATIC_DRAW);
+
+	// We must also define vertex attribute 0.
+	glBindVertexArray(attributelessVAO);
+	glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 0, nullptr);
+	glEnableVertexAttribArray(0);
+}
+
+void OpenGL_BindAttributelessVAO()
+{
+	_dbg_assert_msg_(VIDEO, attributelessVAO != 0, "Attributeless VAO should have already been created.")
+	glBindVertexArray(attributelessVAO);
+}
+
+void OpenGL_DeleteAttributelessVAO()
+{
+	_dbg_assert_msg_(VIDEO, attributelessVAO != 0, "Attributeless VAO should have already been created.")
+	if (attributelessVAO != 0)
+	{
+		glDeleteVertexArrays(1, &attributelessVAO);
+		glDeleteBuffers(1, &attributelessVBO);
+
+		attributelessVAO = 0;
+		attributelessVBO = 0;
+	}
+}