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Location: cpp/openttd-patchpack/source/src/video/opengl.cpp - annotation
r24881:5db3ebe7cd4e
10.8 KiB
text/x-c
Codechange: [OpenGL] Enable driver debug messages if supported.
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r24879:89d0ee92066a r24879:89d0ee92066a r24879:89d0ee92066a r24879:89d0ee92066a r24879:89d0ee92066a r24879:89d0ee92066a r24879:89d0ee92066a r24879:89d0ee92066a r24879:89d0ee92066a r24879:89d0ee92066a r24879:89d0ee92066a r24879:89d0ee92066a r24879:89d0ee92066a r24879:89d0ee92066a r24879:89d0ee92066a r24879:89d0ee92066a r24879:89d0ee92066a | /* $Id$ */
/*
* This file is part of OpenTTD.
* 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.
* 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.
* 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/>.
*/
/** @file opengl_v.cpp OpenGL video driver support. */
#include "../stdafx.h"
#if defined(_WIN32)
# include <windows.h>
#endif
#if defined(__APPLE__)
# include <OpenGL/gl3.h>
#else
# include <GL/gl.h>
#endif
#include "../3rdparty/opengl/glext.h"
#include "opengl.h"
#include "../core/mem_func.hpp"
#include "../gfx_func.h"
#include "../debug.h"
#include "../safeguards.h"
static PFNGLDEBUGMESSAGECONTROLPROC _glDebugMessageControl;
static PFNGLDEBUGMESSAGECALLBACKPROC _glDebugMessageCallback;
/* static */ OpenGLBackend *OpenGLBackend::instance = nullptr;
GetOGLProcAddressProc GetOGLProcAddress;
/**
* Find a substring in a string made of space delimited elements. The substring
* has to match the complete element, partial matches don't count.
* @param string List of space delimited elements.
* @param substring Substring to find.
* @return Pointer to the start of the match or nullptr if the substring is not present.
*/
static const char *FindStringInExtensionList(const char *string, const char *substring)
{
while (1) {
/* Is the extension string present at all? */
const char *pos = strstr(string, substring);
if (pos == nullptr) break;
/* Is this a real match, i.e. are the chars before and after the matched string
* indeed spaces (or the start or end of the string, respectively)? */
const char *end = pos + strlen(substring);
if ((pos == string || pos[-1] == ' ') && (*end == ' ' || *end == '\0')) return pos;
/* False hit, try again for the remaining string. */
string = end;
}
return nullptr;
}
/**
* Check if an OpenGL extension is supported by the current context.
* @param extension The extension string to test.
* @return True if the extension is supported, false if not.
*/
static bool IsOpenGLExtensionSupported(const char *extension)
{
static PFNGLGETSTRINGIPROC glGetStringi = nullptr;
static bool glGetStringi_loaded = false;
/* Starting with OpenGL 3.0 the preferred API to get the extensions
* has changed. Try to load the required function once. */
if (!glGetStringi_loaded) {
if (IsOpenGLVersionAtLeast(3, 0)) glGetStringi = (PFNGLGETSTRINGIPROC)GetOGLProcAddress("glGetStringi");
glGetStringi_loaded = true;
}
if (glGetStringi != nullptr) {
/* New style: Each supported extension can be queried and compared independently. */
GLint num_exts;
glGetIntegerv(GL_NUM_EXTENSIONS, &num_exts);
for (GLint i = 0; i < num_exts; i++) {
const char *entry = (const char *)glGetStringi(GL_EXTENSIONS, i);
if (strcmp(entry, extension) == 0) return true;
}
} else {
/* Old style: A single, space-delimited string for all extensions. */
return FindStringInExtensionList((const char *)glGetString(GL_EXTENSIONS), extension) != nullptr;
}
return false;
}
static byte _gl_major_ver = 0; ///< Major OpenGL version.
static byte _gl_minor_ver = 0; ///< Minor OpenGL version.
/**
* Check if the current OpenGL version is equal or higher than a given one.
* @param major Minimal major version.
* @param minor Minimal minor version.
* @pre OpenGL was initialized.
* @return True if the OpenGL version is equal or higher than the requested one.
*/
bool IsOpenGLVersionAtLeast(byte major, byte minor)
{
return (_gl_major_ver > major) || (_gl_major_ver == major && _gl_minor_ver >= minor);
}
/** Callback to receive OpenGL debug messages. */
void APIENTRY DebugOutputCallback(GLenum source, GLenum type, GLuint id, GLenum severity, GLsizei length, const GLchar *message, const void *userParam)
{
/* Make severity human readable. */
const char *severity_str = "";
switch (severity) {
case GL_DEBUG_SEVERITY_HIGH: severity_str = "high"; break;
case GL_DEBUG_SEVERITY_MEDIUM: severity_str = "medium"; break;
case GL_DEBUG_SEVERITY_LOW: severity_str = "low"; break;
}
/* Make type human readable.*/
const char *type_str = "Other";
switch (type) {
case GL_DEBUG_TYPE_ERROR: type_str = "Error"; break;
case GL_DEBUG_TYPE_DEPRECATED_BEHAVIOR: type_str = "Deprecated"; break;
case GL_DEBUG_TYPE_UNDEFINED_BEHAVIOR: type_str = "Undefined behaviour"; break;
case GL_DEBUG_TYPE_PERFORMANCE: type_str = "Performance"; break;
case GL_DEBUG_TYPE_PORTABILITY: type_str = "Portability"; break;
}
DEBUG(driver, 6, "OpenGL: %s (%s) - %s", type_str, severity_str, message);
}
/** Enable OpenGL debug messages if supported. */
void SetupDebugOutput()
{
#ifndef NO_DEBUG_MESSAGES
if (_debug_driver_level < 6) return;
if (IsOpenGLVersionAtLeast(4, 3)) {
_glDebugMessageControl = (PFNGLDEBUGMESSAGECONTROLPROC)GetOGLProcAddress("glDebugMessageControl");
_glDebugMessageCallback = (PFNGLDEBUGMESSAGECALLBACKPROC)GetOGLProcAddress("glDebugMessageCallback");
} else if (IsOpenGLExtensionSupported("GL_ARB_debug_output")) {
_glDebugMessageControl = (PFNGLDEBUGMESSAGECONTROLPROC)GetOGLProcAddress("glDebugMessageControlARB");
_glDebugMessageCallback = (PFNGLDEBUGMESSAGECALLBACKPROC)GetOGLProcAddress("glDebugMessageCallbackARB");
}
if (_glDebugMessageControl != nullptr && _glDebugMessageCallback != nullptr) {
/* Enable debug output. As synchronous debug output costs performance, we only enable it with a high debug level. */
glEnable(GL_DEBUG_OUTPUT);
if (_debug_driver_level >= 8) glEnable(GL_DEBUG_OUTPUT_SYNCHRONOUS);
_glDebugMessageCallback(&DebugOutputCallback, nullptr);
/* Enable all messages on highest debug level.*/
_glDebugMessageControl(GL_DONT_CARE, GL_DONT_CARE, GL_DONT_CARE, 0, nullptr, _debug_driver_level >= 9 ? GL_TRUE : GL_FALSE);
/* Get debug messages for errors and undefined/deprecated behaviour. */
_glDebugMessageControl(GL_DONT_CARE, GL_DEBUG_TYPE_ERROR, GL_DONT_CARE, 0, nullptr, GL_TRUE);
_glDebugMessageControl(GL_DONT_CARE, GL_DEBUG_TYPE_UNDEFINED_BEHAVIOR, GL_DONT_CARE, 0, nullptr, GL_TRUE);
_glDebugMessageControl(GL_DONT_CARE, GL_DEBUG_TYPE_DEPRECATED_BEHAVIOR, GL_DONT_CARE, 0, nullptr, GL_TRUE);
}
#endif
}
/**
* Create and initialize the singleton back-end class.
* @param get_proc Callback to get an OpenGL function from the OS driver.
* @return nullptr on success, error message otherwise.
*/
/* static */ const char *OpenGLBackend::Create(GetOGLProcAddressProc get_proc)
{
if (OpenGLBackend::instance != nullptr) OpenGLBackend::Destroy();
GetOGLProcAddress = get_proc;
OpenGLBackend::instance = new OpenGLBackend();
return OpenGLBackend::instance->Init();
}
/**
* Free resources and destroy singleton back-end class.
*/
/* static */ void OpenGLBackend::Destroy()
{
delete OpenGLBackend::instance;
OpenGLBackend::instance = nullptr;
}
/**
* Construct OpenGL back-end class.
*/
OpenGLBackend::OpenGLBackend()
{
}
/**
* Free allocated resources.
*/
OpenGLBackend::~OpenGLBackend()
{
glDeleteTextures(1, &this->vid_texture);
free(this->vid_buffer);
}
/**
* Check for the needed OpenGL functionality and allocate all resources.
* @return Error string or nullptr if successful.
*/
const char *OpenGLBackend::Init()
{
/* Always query the supported OpenGL version as the current context might have changed. */
const char *ver = (const char *)glGetString(GL_VERSION);
const char *vend = (const char *)glGetString(GL_VENDOR);
const char *renderer = (const char *)glGetString(GL_RENDERER);
if (ver == nullptr || vend == nullptr || renderer == nullptr) return "OpenGL not supported";
DEBUG(driver, 1, "OpenGL driver: %s - %s (%s)", vend, renderer, ver);
const char *minor = strchr(ver, '.');
_gl_major_ver = atoi(ver);
_gl_minor_ver = minor != nullptr ? atoi(minor + 1) : 0;
SetupDebugOutput();
/* OpenGL 1.3 is the absolute minimum. */
if (!IsOpenGLVersionAtLeast(1, 3)) return "OpenGL version >= 1.3 required";
/* Check for non-power-of-two texture support. */
if (!IsOpenGLVersionAtLeast(2, 0) && !IsOpenGLExtensionSupported("GL_ARB_texture_non_power_of_two")) return "Non-power-of-two textures not supported";
/* Setup video buffer texture. */
glGenTextures(1, &this->vid_texture);
glBindTexture(GL_TEXTURE_2D, this->vid_texture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 0);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glBindTexture(GL_TEXTURE_2D, 0);
if (glGetError() != GL_NO_ERROR) return "Can't generate video buffer texture";
/* Prime vertex array with a full-screen quad. */
static const float vert_array[] = { 1.f, -1.f, 1.f, 1.f, -1.f, -1.f, -1.f, 1.f };
static const float tex_array[] = { 1.f, 1.f, 1.f, 0.f, 0.f, 1.f, 0.f, 0.f };
glVertexPointer(2, GL_FLOAT, 0, vert_array);
glTexCoordPointer(2, GL_FLOAT, 0, tex_array);
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
glDisable(GL_DEPTH_TEST);
glEnable(GL_TEXTURE_2D);
(void)glGetError(); // Clear errors.
return nullptr;
}
/**
* Change the size of the drawing window and allocate matching resources.
* @param w New width of the window.
* @param h New height of the window.
* @param force Recreate resources even if size didn't change.
* @param False if nothing had to be done, true otherwise.
*/
bool OpenGLBackend::Resize(int w, int h, bool force)
{
if (!force && _screen.width == w && _screen.height == h && this->vid_buffer != nullptr) return false;
glViewport(0, 0, w, h);
/* Re-allocate video buffer texture. */
free(this->vid_buffer);
this->vid_buffer = CallocT<uint32>(w * h); // 32bpp
glBindTexture(GL_TEXTURE_2D, this->vid_texture);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, w, h, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, nullptr);
glBindTexture(GL_TEXTURE_2D, 0);
/* Set new viewport. */
_screen.height = h;
_screen.width = w;
_screen.pitch = w;
_screen.dst_ptr = this->GetVideoBuffer();
return true;
}
/**
* Render video buffer to the screen.
*/
void OpenGLBackend::Paint()
{
assert(this->vid_buffer != nullptr);
glClear(GL_COLOR_BUFFER_BIT);
/* Update changed rect of the video buffer texture. */
glBindTexture(GL_TEXTURE_2D, this->vid_texture);
glPixelStorei(GL_UNPACK_ROW_LENGTH, _screen.pitch);
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, _screen.width, _screen.height, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, this->vid_buffer);
/* Blit video buffer to screen. */
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
}
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