2021-01-16 16:43:04 +01:00
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/* $Id$ */
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/*
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* This file is part of OpenTTD.
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* OpenTTD 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, version 2.
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* OpenTTD 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.
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* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file opengl_v.cpp OpenGL video driver support. */
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#include "../stdafx.h"
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#if defined(_WIN32)
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# include <windows.h>
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#endif
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#if defined(__APPLE__)
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# include <OpenGL/gl3.h>
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#else
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# include <GL/gl.h>
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#endif
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#include "../3rdparty/opengl/glext.h"
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#include "opengl.h"
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#include "../core/mem_func.hpp"
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2021-02-21 00:35:35 +01:00
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#include "../core/geometry_func.hpp"
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2021-01-16 16:43:04 +01:00
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#include "../gfx_func.h"
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#include "../debug.h"
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#include "../safeguards.h"
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2021-01-16 16:43:07 +01:00
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static PFNGLDEBUGMESSAGECONTROLPROC _glDebugMessageControl;
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static PFNGLDEBUGMESSAGECALLBACKPROC _glDebugMessageCallback;
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2021-01-16 16:43:04 +01:00
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/* static */ OpenGLBackend *OpenGLBackend::instance = nullptr;
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2021-01-16 16:43:05 +01:00
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GetOGLProcAddressProc GetOGLProcAddress;
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2021-01-16 16:43:04 +01:00
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/**
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* Find a substring in a string made of space delimited elements. The substring
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* has to match the complete element, partial matches don't count.
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* @param string List of space delimited elements.
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* @param substring Substring to find.
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* @return Pointer to the start of the match or nullptr if the substring is not present.
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*/
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static const char *FindStringInExtensionList(const char *string, const char *substring)
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{
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while (1) {
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/* Is the extension string present at all? */
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const char *pos = strstr(string, substring);
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if (pos == nullptr) break;
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/* Is this a real match, i.e. are the chars before and after the matched string
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* indeed spaces (or the start or end of the string, respectively)? */
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const char *end = pos + strlen(substring);
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if ((pos == string || pos[-1] == ' ') && (*end == ' ' || *end == '\0')) return pos;
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/* False hit, try again for the remaining string. */
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string = end;
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}
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return nullptr;
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}
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/**
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* Check if an OpenGL extension is supported by the current context.
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* @param extension The extension string to test.
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* @return True if the extension is supported, false if not.
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*/
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static bool IsOpenGLExtensionSupported(const char *extension)
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{
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static PFNGLGETSTRINGIPROC glGetStringi = nullptr;
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static bool glGetStringi_loaded = false;
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/* Starting with OpenGL 3.0 the preferred API to get the extensions
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* has changed. Try to load the required function once. */
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if (!glGetStringi_loaded) {
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if (IsOpenGLVersionAtLeast(3, 0)) glGetStringi = (PFNGLGETSTRINGIPROC)GetOGLProcAddress("glGetStringi");
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glGetStringi_loaded = true;
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}
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if (glGetStringi != nullptr) {
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/* New style: Each supported extension can be queried and compared independently. */
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GLint num_exts;
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glGetIntegerv(GL_NUM_EXTENSIONS, &num_exts);
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for (GLint i = 0; i < num_exts; i++) {
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const char *entry = (const char *)glGetStringi(GL_EXTENSIONS, i);
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if (strcmp(entry, extension) == 0) return true;
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}
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} else {
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/* Old style: A single, space-delimited string for all extensions. */
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return FindStringInExtensionList((const char *)glGetString(GL_EXTENSIONS), extension) != nullptr;
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}
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return false;
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}
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static byte _gl_major_ver = 0; ///< Major OpenGL version.
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static byte _gl_minor_ver = 0; ///< Minor OpenGL version.
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/**
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* Check if the current OpenGL version is equal or higher than a given one.
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* @param major Minimal major version.
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* @param minor Minimal minor version.
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* @pre OpenGL was initialized.
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* @return True if the OpenGL version is equal or higher than the requested one.
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*/
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bool IsOpenGLVersionAtLeast(byte major, byte minor)
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{
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return (_gl_major_ver > major) || (_gl_major_ver == major && _gl_minor_ver >= minor);
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}
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/** Callback to receive OpenGL debug messages. */
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void APIENTRY DebugOutputCallback(GLenum source, GLenum type, GLuint id, GLenum severity, GLsizei length, const GLchar *message, const void *userParam)
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{
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/* Make severity human readable. */
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const char *severity_str = "";
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switch (severity) {
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case GL_DEBUG_SEVERITY_HIGH: severity_str = "high"; break;
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case GL_DEBUG_SEVERITY_MEDIUM: severity_str = "medium"; break;
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case GL_DEBUG_SEVERITY_LOW: severity_str = "low"; break;
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}
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/* Make type human readable.*/
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const char *type_str = "Other";
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switch (type) {
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case GL_DEBUG_TYPE_ERROR: type_str = "Error"; break;
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case GL_DEBUG_TYPE_DEPRECATED_BEHAVIOR: type_str = "Deprecated"; break;
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case GL_DEBUG_TYPE_UNDEFINED_BEHAVIOR: type_str = "Undefined behaviour"; break;
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case GL_DEBUG_TYPE_PERFORMANCE: type_str = "Performance"; break;
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case GL_DEBUG_TYPE_PORTABILITY: type_str = "Portability"; break;
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}
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DEBUG(driver, 6, "OpenGL: %s (%s) - %s", type_str, severity_str, message);
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}
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/** Enable OpenGL debug messages if supported. */
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void SetupDebugOutput()
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{
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#ifndef NO_DEBUG_MESSAGES
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if (_debug_driver_level < 6) return;
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if (IsOpenGLVersionAtLeast(4, 3)) {
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_glDebugMessageControl = (PFNGLDEBUGMESSAGECONTROLPROC)GetOGLProcAddress("glDebugMessageControl");
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_glDebugMessageCallback = (PFNGLDEBUGMESSAGECALLBACKPROC)GetOGLProcAddress("glDebugMessageCallback");
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} else if (IsOpenGLExtensionSupported("GL_ARB_debug_output")) {
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_glDebugMessageControl = (PFNGLDEBUGMESSAGECONTROLPROC)GetOGLProcAddress("glDebugMessageControlARB");
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_glDebugMessageCallback = (PFNGLDEBUGMESSAGECALLBACKPROC)GetOGLProcAddress("glDebugMessageCallbackARB");
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}
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if (_glDebugMessageControl != nullptr && _glDebugMessageCallback != nullptr) {
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/* Enable debug output. As synchronous debug output costs performance, we only enable it with a high debug level. */
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glEnable(GL_DEBUG_OUTPUT);
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if (_debug_driver_level >= 8) glEnable(GL_DEBUG_OUTPUT_SYNCHRONOUS);
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_glDebugMessageCallback(&DebugOutputCallback, nullptr);
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/* Enable all messages on highest debug level.*/
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_glDebugMessageControl(GL_DONT_CARE, GL_DONT_CARE, GL_DONT_CARE, 0, nullptr, _debug_driver_level >= 9 ? GL_TRUE : GL_FALSE);
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/* Get debug messages for errors and undefined/deprecated behaviour. */
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_glDebugMessageControl(GL_DONT_CARE, GL_DEBUG_TYPE_ERROR, GL_DONT_CARE, 0, nullptr, GL_TRUE);
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_glDebugMessageControl(GL_DONT_CARE, GL_DEBUG_TYPE_UNDEFINED_BEHAVIOR, GL_DONT_CARE, 0, nullptr, GL_TRUE);
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_glDebugMessageControl(GL_DONT_CARE, GL_DEBUG_TYPE_DEPRECATED_BEHAVIOR, GL_DONT_CARE, 0, nullptr, GL_TRUE);
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}
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#endif
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}
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/**
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* Create and initialize the singleton back-end class.
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* @param get_proc Callback to get an OpenGL function from the OS driver.
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* @return nullptr on success, error message otherwise.
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*/
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/* static */ const char *OpenGLBackend::Create(GetOGLProcAddressProc get_proc)
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{
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if (OpenGLBackend::instance != nullptr) OpenGLBackend::Destroy();
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GetOGLProcAddress = get_proc;
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OpenGLBackend::instance = new OpenGLBackend();
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return OpenGLBackend::instance->Init();
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}
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/**
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* Free resources and destroy singleton back-end class.
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*/
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/* static */ void OpenGLBackend::Destroy()
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{
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delete OpenGLBackend::instance;
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OpenGLBackend::instance = nullptr;
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}
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/**
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* Construct OpenGL back-end class.
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*/
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OpenGLBackend::OpenGLBackend()
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{
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}
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/**
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* Free allocated resources.
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*/
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OpenGLBackend::~OpenGLBackend()
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{
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glDeleteTextures(1, &this->vid_texture);
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free(this->vid_buffer);
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}
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/**
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* Check for the needed OpenGL functionality and allocate all resources.
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* @return Error string or nullptr if successful.
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*/
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const char *OpenGLBackend::Init()
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{
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/* Always query the supported OpenGL version as the current context might have changed. */
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const char *ver = (const char *)glGetString(GL_VERSION);
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const char *vend = (const char *)glGetString(GL_VENDOR);
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const char *renderer = (const char *)glGetString(GL_RENDERER);
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if (ver == nullptr || vend == nullptr || renderer == nullptr) return "OpenGL not supported";
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DEBUG(driver, 1, "OpenGL driver: %s - %s (%s)", vend, renderer, ver);
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const char *minor = strchr(ver, '.');
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_gl_major_ver = atoi(ver);
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_gl_minor_ver = minor != nullptr ? atoi(minor + 1) : 0;
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SetupDebugOutput();
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/* OpenGL 1.3 is the absolute minimum. */
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if (!IsOpenGLVersionAtLeast(1, 3)) return "OpenGL version >= 1.3 required";
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/* Check for non-power-of-two texture support. */
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if (!IsOpenGLVersionAtLeast(2, 0) && !IsOpenGLExtensionSupported("GL_ARB_texture_non_power_of_two")) return "Non-power-of-two textures not supported";
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/* Setup video buffer texture. */
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glGenTextures(1, &this->vid_texture);
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glBindTexture(GL_TEXTURE_2D, this->vid_texture);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 0);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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glBindTexture(GL_TEXTURE_2D, 0);
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if (glGetError() != GL_NO_ERROR) return "Can't generate video buffer texture";
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/* Prime vertex array with a full-screen quad. */
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static const float vert_array[] = { 1.f, -1.f, 1.f, 1.f, -1.f, -1.f, -1.f, 1.f };
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static const float tex_array[] = { 1.f, 1.f, 1.f, 0.f, 0.f, 1.f, 0.f, 0.f };
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glVertexPointer(2, GL_FLOAT, 0, vert_array);
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glTexCoordPointer(2, GL_FLOAT, 0, tex_array);
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glEnableClientState(GL_VERTEX_ARRAY);
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glEnableClientState(GL_TEXTURE_COORD_ARRAY);
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glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
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glDisable(GL_DEPTH_TEST);
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glEnable(GL_TEXTURE_2D);
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(void)glGetError(); // Clear errors.
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return nullptr;
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}
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/**
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* Change the size of the drawing window and allocate matching resources.
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* @param w New width of the window.
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* @param h New height of the window.
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* @param force Recreate resources even if size didn't change.
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* @param False if nothing had to be done, true otherwise.
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*/
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bool OpenGLBackend::Resize(int w, int h, bool force)
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{
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if (!force && _screen.width == w && _screen.height == h && this->vid_buffer != nullptr) return false;
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glViewport(0, 0, w, h);
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/* Re-allocate video buffer texture. */
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free(this->vid_buffer);
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this->vid_buffer = CallocT<uint32>(w * h); // 32bpp
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glBindTexture(GL_TEXTURE_2D, this->vid_texture);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, w, h, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, nullptr);
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glBindTexture(GL_TEXTURE_2D, 0);
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/* Set new viewport. */
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_screen.height = h;
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_screen.width = w;
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_screen.pitch = w;
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_screen.dst_ptr = this->GetVideoBuffer();
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return true;
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}
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/**
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* Render video buffer to the screen.
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* @param update_rect Rectangle encompassing the dirty region of the video buffer.
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*/
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void OpenGLBackend::Paint(Rect update_rect)
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{
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assert(this->vid_buffer != nullptr);
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glClear(GL_COLOR_BUFFER_BIT);
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/* Update changed rect of the video buffer texture. */
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glBindTexture(GL_TEXTURE_2D, this->vid_texture);
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if (!IsEmptyRect(update_rect)) {
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glPixelStorei(GL_UNPACK_ROW_LENGTH, _screen.pitch);
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glTexSubImage2D(GL_TEXTURE_2D, 0, update_rect.left, update_rect.top, update_rect.right - update_rect.left, update_rect.bottom - update_rect.top, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, (uint32 *)this->vid_buffer + update_rect.top * _screen.pitch + update_rect.left);
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}
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/* Blit video buffer to screen. */
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glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
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}
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