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@ r24895:0ba728d1a5e0
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Location: cpp/openttd-patchpack/source/src/video/opengl.cpp
r24895:0ba728d1a5e0
30.1 KiB
text/x-c
Add: [OpenGL] Support for 8bpp blitters.
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/*
* 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/geometry_func.hpp"
#include "../core/mem_func.hpp"
#include "../core/math_func.hpp"
#include "../gfx_func.h"
#include "../debug.h"
#include "../blitter/factory.hpp"
#include "../table/opengl_shader.h"
#include "../safeguards.h"
static PFNGLDEBUGMESSAGECONTROLPROC _glDebugMessageControl;
static PFNGLDEBUGMESSAGECALLBACKPROC _glDebugMessageCallback;
static PFNGLACTIVETEXTUREPROC _glActiveTexture;
static PFNGLGENBUFFERSPROC _glGenBuffers;
static PFNGLDELETEBUFFERSPROC _glDeleteBuffers;
static PFNGLBINDBUFFERPROC _glBindBuffer;
static PFNGLBUFFERDATAPROC _glBufferData;
static PFNGLMAPBUFFERPROC _glMapBuffer;
static PFNGLUNMAPBUFFERPROC _glUnmapBuffer;
static PFNGLGENVERTEXARRAYSPROC _glGenVertexArrays;
static PFNGLDELETEVERTEXARRAYSPROC _glDeleteVertexArrays;
static PFNGLBINDVERTEXARRAYPROC _glBindVertexArray;
static PFNGLCREATEPROGRAMPROC _glCreateProgram;
static PFNGLDELETEPROGRAMPROC _glDeleteProgram;
static PFNGLLINKPROGRAMPROC _glLinkProgram;
static PFNGLUSEPROGRAMPROC _glUseProgram;
static PFNGLGETPROGRAMIVPROC _glGetProgramiv;
static PFNGLGETPROGRAMINFOLOGPROC _glGetProgramInfoLog;
static PFNGLCREATESHADERPROC _glCreateShader;
static PFNGLDELETESHADERPROC _glDeleteShader;
static PFNGLSHADERSOURCEPROC _glShaderSource;
static PFNGLCOMPILESHADERPROC _glCompileShader;
static PFNGLATTACHSHADERPROC _glAttachShader;
static PFNGLGETSHADERIVPROC _glGetShaderiv;
static PFNGLGETSHADERINFOLOGPROC _glGetShaderInfoLog;
static PFNGLGETUNIFORMLOCATIONPROC _glGetUniformLocation;
static PFNGLUNIFORM1IPROC _glUniform1i;
static PFNGLGETATTRIBLOCATIONPROC _glGetAttribLocation;
static PFNGLENABLEVERTEXATTRIBARRAYPROC _glEnableVertexAttribArray;
static PFNGLDISABLEVERTEXATTRIBARRAYPROC _glDisableVertexAttribArray;
static PFNGLVERTEXATTRIBPOINTERARBPROC _glVertexAttribPointer;
static PFNGLBINDFRAGDATALOCATIONPROC _glBindFragDataLocation;
/** A simple 2D vertex with just position and texture. */
struct Simple2DVertex {
float x, y;
float u, v;
};
/* 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.
*/
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);
}
/** Bind texture-related extension functions. */
static bool BindTextureExtensions()
{
if (IsOpenGLVersionAtLeast(1, 3)) {
_glActiveTexture = (PFNGLACTIVETEXTUREPROC)GetOGLProcAddress("glActiveTexture");
} else {
_glActiveTexture = (PFNGLACTIVETEXTUREPROC)GetOGLProcAddress("glActiveTextureARB");
}
return _glActiveTexture != nullptr;
}
/** Bind vertex buffer object extension functions. */
static bool BindVBOExtension()
{
if (IsOpenGLVersionAtLeast(1, 5)) {
_glGenBuffers = (PFNGLGENBUFFERSPROC)GetOGLProcAddress("glGenBuffers");
_glDeleteBuffers = (PFNGLDELETEBUFFERSPROC)GetOGLProcAddress("glDeleteBuffers");
_glBindBuffer = (PFNGLBINDBUFFERPROC)GetOGLProcAddress("glBindBuffer");
_glBufferData = (PFNGLBUFFERDATAPROC)GetOGLProcAddress("glBufferData");
_glMapBuffer = (PFNGLMAPBUFFERPROC)GetOGLProcAddress("glMapBuffer");
_glUnmapBuffer = (PFNGLUNMAPBUFFERPROC)GetOGLProcAddress("glUnmapBuffer");
} else {
_glGenBuffers = (PFNGLGENBUFFERSPROC)GetOGLProcAddress("glGenBuffersARB");
_glDeleteBuffers = (PFNGLDELETEBUFFERSPROC)GetOGLProcAddress("glDeleteBuffersARB");
_glBindBuffer = (PFNGLBINDBUFFERPROC)GetOGLProcAddress("glBindBufferARB");
_glBufferData = (PFNGLBUFFERDATAPROC)GetOGLProcAddress("glBufferDataARB");
_glMapBuffer = (PFNGLMAPBUFFERPROC)GetOGLProcAddress("glMapBufferARB");
_glUnmapBuffer = (PFNGLUNMAPBUFFERPROC)GetOGLProcAddress("glUnmapBufferARB");
}
return _glGenBuffers != nullptr && _glDeleteBuffers != nullptr && _glBindBuffer != nullptr && _glBufferData != nullptr && _glMapBuffer != nullptr && _glUnmapBuffer != nullptr;
}
/** Bind vertex array object extension functions. */
static bool BindVBAExtension()
{
/* The APPLE and ARB variants have different semantics (that don't matter for us).
* Successfully getting pointers to one variant doesn't mean it is supported for
* the current context. Always check the extension strings as well. */
if (IsOpenGLVersionAtLeast(3, 0) || IsOpenGLExtensionSupported("GL_ARB_vertex_array_object")) {
_glGenVertexArrays = (PFNGLGENVERTEXARRAYSPROC)GetOGLProcAddress("glGenVertexArrays");
_glDeleteVertexArrays = (PFNGLDELETEVERTEXARRAYSPROC)GetOGLProcAddress("glDeleteVertexArrays");
_glBindVertexArray = (PFNGLBINDVERTEXARRAYPROC)GetOGLProcAddress("glBindVertexArray");
} else if (IsOpenGLExtensionSupported("GL_APPLE_vertex_array_object")) {
_glGenVertexArrays = (PFNGLGENVERTEXARRAYSPROC)GetOGLProcAddress("glGenVertexArraysAPPLE");
_glDeleteVertexArrays = (PFNGLDELETEVERTEXARRAYSPROC)GetOGLProcAddress("glDeleteVertexArraysAPPLE");
_glBindVertexArray = (PFNGLBINDVERTEXARRAYPROC)GetOGLProcAddress("glBindVertexArrayAPPLE");
}
return _glGenVertexArrays != nullptr && _glDeleteVertexArrays != nullptr && _glBindVertexArray != nullptr;
}
/** Bind extension functions for shader support. */
static bool BindShaderExtensions()
{
if (IsOpenGLVersionAtLeast(2, 0)) {
_glCreateProgram = (PFNGLCREATEPROGRAMPROC)GetOGLProcAddress("glCreateProgram");
_glDeleteProgram = (PFNGLDELETEPROGRAMPROC)GetOGLProcAddress("glDeleteProgram");
_glLinkProgram = (PFNGLLINKPROGRAMPROC)GetOGLProcAddress("glLinkProgram");
_glUseProgram = (PFNGLUSEPROGRAMPROC)GetOGLProcAddress("glUseProgram");
_glGetProgramiv = (PFNGLGETPROGRAMIVPROC)GetOGLProcAddress("glGetProgramiv");
_glGetProgramInfoLog = (PFNGLGETPROGRAMINFOLOGPROC)GetOGLProcAddress("glGetProgramInfoLog");
_glCreateShader = (PFNGLCREATESHADERPROC)GetOGLProcAddress("glCreateShader");
_glDeleteShader = (PFNGLDELETESHADERPROC)GetOGLProcAddress("glDeleteShader");
_glShaderSource = (PFNGLSHADERSOURCEPROC)GetOGLProcAddress("glShaderSource");
_glCompileShader = (PFNGLCOMPILESHADERPROC)GetOGLProcAddress("glCompileShader");
_glAttachShader = (PFNGLATTACHSHADERPROC)GetOGLProcAddress("glAttachShader");
_glGetShaderiv = (PFNGLGETSHADERIVPROC)GetOGLProcAddress("glGetShaderiv");
_glGetShaderInfoLog = (PFNGLGETSHADERINFOLOGPROC)GetOGLProcAddress("glGetShaderInfoLog");
_glGetUniformLocation = (PFNGLGETUNIFORMLOCATIONPROC)GetOGLProcAddress("glGetUniformLocation");
_glUniform1i = (PFNGLUNIFORM1IPROC)GetOGLProcAddress("glUniform1i");
_glGetAttribLocation = (PFNGLGETATTRIBLOCATIONPROC)GetOGLProcAddress("glGetAttribLocation");
_glEnableVertexAttribArray = (PFNGLENABLEVERTEXATTRIBARRAYPROC)GetOGLProcAddress("glEnableVertexAttribArray");
_glDisableVertexAttribArray = (PFNGLDISABLEVERTEXATTRIBARRAYPROC)GetOGLProcAddress("glDisableVertexAttribArray");
_glVertexAttribPointer = (PFNGLVERTEXATTRIBPOINTERARBPROC)GetOGLProcAddress("glVertexAttribPointer");
} else {
/* In the ARB extension programs and shaders are in the same object space. */
_glCreateProgram = (PFNGLCREATEPROGRAMPROC)GetOGLProcAddress("glCreateProgramObjectARB");
_glDeleteProgram = (PFNGLDELETEPROGRAMPROC)GetOGLProcAddress("glDeleteObjectARB");
_glLinkProgram = (PFNGLLINKPROGRAMPROC)GetOGLProcAddress("glLinkProgramARB");
_glUseProgram = (PFNGLUSEPROGRAMPROC)GetOGLProcAddress("glUseProgramObjectARB");
_glGetProgramiv = (PFNGLGETPROGRAMIVPROC)GetOGLProcAddress("glGetObjectParameterivARB");
_glGetProgramInfoLog = (PFNGLGETPROGRAMINFOLOGPROC)GetOGLProcAddress("glGetInfoLogARB");
_glCreateShader = (PFNGLCREATESHADERPROC)GetOGLProcAddress("glCreateShaderObjectARB");
_glDeleteShader = (PFNGLDELETESHADERPROC)GetOGLProcAddress("glDeleteObjectARB");
_glShaderSource = (PFNGLSHADERSOURCEPROC)GetOGLProcAddress("glShaderSourceARB");
_glCompileShader = (PFNGLCOMPILESHADERPROC)GetOGLProcAddress("glCompileShaderARB");
_glAttachShader = (PFNGLATTACHSHADERPROC)GetOGLProcAddress("glAttachObjectARB");
_glGetShaderiv = (PFNGLGETSHADERIVPROC)GetOGLProcAddress("glGetObjectParameterivARB");
_glGetShaderInfoLog = (PFNGLGETSHADERINFOLOGPROC)GetOGLProcAddress("glGetInfoLogARB");
_glGetUniformLocation = (PFNGLGETUNIFORMLOCATIONPROC)GetOGLProcAddress("glGetUniformLocationARB");
_glUniform1i = (PFNGLUNIFORM1IPROC)GetOGLProcAddress("glUniform1iARB");
_glGetAttribLocation = (PFNGLGETATTRIBLOCATIONPROC)GetOGLProcAddress("glGetAttribLocationARB");
_glEnableVertexAttribArray = (PFNGLENABLEVERTEXATTRIBARRAYPROC)GetOGLProcAddress("glEnableVertexAttribArrayARB");
_glDisableVertexAttribArray = (PFNGLDISABLEVERTEXATTRIBARRAYPROC)GetOGLProcAddress("glDisableVertexAttribArrayARB");
_glVertexAttribPointer = (PFNGLVERTEXATTRIBPOINTERARBPROC)GetOGLProcAddress("glVertexAttribPointerARB");
}
/* Bind functions only needed when using GLSL 1.50 shaders. */
if (IsOpenGLVersionAtLeast(3, 0)) {
_glBindFragDataLocation = (PFNGLBINDFRAGDATALOCATIONPROC)GetOGLProcAddress("glBindFragDataLocation");
} else if (IsOpenGLExtensionSupported("GL_EXT_gpu_shader4")) {
_glBindFragDataLocation = (PFNGLBINDFRAGDATALOCATIONPROC)GetOGLProcAddress("glBindFragDataLocationEXT");
} else {
_glBindFragDataLocation = nullptr;
}
return _glCreateProgram != nullptr && _glDeleteProgram != nullptr && _glLinkProgram != nullptr && _glGetProgramiv != nullptr && _glGetProgramInfoLog != nullptr &&
_glCreateShader != nullptr && _glDeleteShader != nullptr && _glShaderSource != nullptr && _glCompileShader != nullptr && _glAttachShader != nullptr &&
_glGetShaderiv != nullptr && _glGetShaderInfoLog != nullptr && _glGetUniformLocation != nullptr && _glUniform1i != nullptr &&
_glGetAttribLocation != nullptr && _glEnableVertexAttribArray != nullptr && _glDisableVertexAttribArray != nullptr && _glVertexAttribPointer != nullptr;
}
/** 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()
{
if (_glDeleteProgram != nullptr) {
_glDeleteProgram(this->vid_program);
_glDeleteProgram(this->pal_program);
}
if (_glDeleteVertexArrays != nullptr) _glDeleteVertexArrays(1, &this->vao_quad);
if (_glDeleteBuffers != nullptr) {
_glDeleteBuffers(1, &this->vbo_quad);
_glDeleteBuffers(1, &this->vid_pbo);
}
glDeleteTextures(1, &this->vid_texture);
glDeleteTextures(1, &this->pal_texture);
}
/**
* 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";
/* Check for single element texture formats. */
if (!IsOpenGLVersionAtLeast(3, 0) && !IsOpenGLExtensionSupported("GL_ARB_texture_rg")) return "Single element texture formats not supported";
if (!BindTextureExtensions()) return "Failed to bind texture extension functions";
/* Check for vertex buffer objects. */
if (!IsOpenGLVersionAtLeast(1, 5) && !IsOpenGLExtensionSupported("ARB_vertex_buffer_object")) return "Vertex buffer objects not supported";
if (!BindVBOExtension()) return "Failed to bind VBO extension functions";
/* Check for pixel buffer objects. */
if (!IsOpenGLVersionAtLeast(2, 1) && !IsOpenGLExtensionSupported("GL_ARB_pixel_buffer_object")) return "Pixel buffer objects not supported";
/* Check for vertex array objects. */
if (!IsOpenGLVersionAtLeast(3, 0) && (!IsOpenGLExtensionSupported("GL_ARB_vertex_array_object") || !IsOpenGLExtensionSupported("GL_APPLE_vertex_array_object"))) return "Vertex array objects not supported";
if (!BindVBAExtension()) return "Failed to bind VBA extension functions";
/* Check for shader objects. */
if (!IsOpenGLVersionAtLeast(2, 0) && (!IsOpenGLExtensionSupported("GL_ARB_shader_objects") || !IsOpenGLExtensionSupported("GL_ARB_fragment_shader") || !IsOpenGLExtensionSupported("GL_ARB_vertex_shader"))) return "No shader support";
if (!BindShaderExtensions()) return "Failed to bind shader extension functions";
if (IsOpenGLVersionAtLeast(3, 2) && _glBindFragDataLocation == nullptr) return "OpenGL claims to support version 3.2 but doesn't have glBindFragDataLocation";
DEBUG(driver, 2, "OpenGL shading language version: %s", (const char *)glGetString(GL_SHADING_LANGUAGE_VERSION));
if (!this->InitShaders()) return "Failed to initialize shaders";
/* 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";
/* Setup palette texture. */
glGenTextures(1, &this->pal_texture);
glBindTexture(GL_TEXTURE_1D, this->pal_texture);
glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MAX_LEVEL, 0);
glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexImage1D(GL_TEXTURE_1D, 0, GL_RGBA8, 256, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, nullptr);
glBindTexture(GL_TEXTURE_1D, 0);
if (glGetError() != GL_NO_ERROR) return "Can't generate palette lookup texture";
/* Bind uniforms in RGB rendering shader program. */
GLint tex_location = _glGetUniformLocation(this->vid_program, "colour_tex");
GLint palette_location = _glGetUniformLocation(this->vid_program, "palette");
_glUseProgram(this->vid_program);
_glUniform1i(tex_location, 0); // Texture unit 0.
_glUniform1i(palette_location, 1); // Texture unit 1.
/* Bind uniforms in palette rendering shader program. */
tex_location = _glGetUniformLocation(this->pal_program, "colour_tex");
palette_location = _glGetUniformLocation(this->pal_program, "palette");
_glUseProgram(this->pal_program);
_glUniform1i(tex_location, 0); // Texture unit 0.
_glUniform1i(palette_location, 1); // Texture unit 1.
/* Create pixel buffer object as video buffer storage. */
_glGenBuffers(1, &this->vid_pbo);
_glBindBuffer(GL_PIXEL_UNPACK_BUFFER, this->vid_pbo);
if (glGetError() != GL_NO_ERROR) return "Can't allocate pixel buffer for video buffer";
/* Prime vertex buffer with a full-screen quad and store
* the corresponding state in a vertex array object. */
static const Simple2DVertex vert_array[] = {
// x y u v
{ 1.f, -1.f, 1.f, 1.f },
{ 1.f, 1.f, 1.f, 0.f },
{ -1.f, -1.f, 0.f, 1.f },
{ -1.f, 1.f, 0.f, 0.f },
};
/* Create VAO. */
_glGenVertexArrays(1, &this->vao_quad);
_glBindVertexArray(this->vao_quad);
/* Create and fill VBO. */
_glGenBuffers(1, &this->vbo_quad);
_glBindBuffer(GL_ARRAY_BUFFER, this->vbo_quad);
_glBufferData(GL_ARRAY_BUFFER, sizeof(vert_array), vert_array, GL_STATIC_DRAW);
if (glGetError() != GL_NO_ERROR) return "Can't generate VBO for fullscreen quad";
/* Set vertex state. */
GLint loc_position = _glGetAttribLocation(this->vid_program, "position");
GLint colour_position = _glGetAttribLocation(this->vid_program, "colour_uv");
_glEnableVertexAttribArray(loc_position);
_glEnableVertexAttribArray(colour_position);
_glVertexAttribPointer(loc_position, 2, GL_FLOAT, GL_FALSE, sizeof(Simple2DVertex), (GLvoid *)offsetof(Simple2DVertex, x));
_glVertexAttribPointer(colour_position, 2, GL_FLOAT, GL_FALSE, sizeof(Simple2DVertex), (GLvoid *)offsetof(Simple2DVertex, u));
_glBindVertexArray(0);
glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
glDisable(GL_DEPTH_TEST);
(void)glGetError(); // Clear errors.
return nullptr;
}
/**
* Check a shader for compilation errors and log them if necessary.
* @param shader Shader to check.
* @return True if the shader is valid.
*/
static bool VerifyShader(GLuint shader)
{
static ReusableBuffer<char> log_buf;
GLint result = GL_FALSE;
_glGetShaderiv(shader, GL_COMPILE_STATUS, &result);
/* Output log if there is one. */
GLint log_len = 0;
_glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &log_len);
if (log_len > 0) {
_glGetShaderInfoLog(shader, log_len, nullptr, log_buf.Allocate(log_len));
DEBUG(driver, result != GL_TRUE ? 0 : 2, "%s", log_buf.GetBuffer()); // Always print on failure.
}
return result == GL_TRUE;
}
/**
* Check a program for link errors and log them if necessary.
* @param program Program to check.
* @return True if the program is valid.
*/
static bool VerifyProgram(GLuint program)
{
static ReusableBuffer<char> log_buf;
GLint result = GL_FALSE;
_glGetProgramiv(program, GL_LINK_STATUS, &result);
/* Output log if there is one. */
GLint log_len = 0;
_glGetProgramiv(program, GL_INFO_LOG_LENGTH, &log_len);
if (log_len > 0) {
_glGetProgramInfoLog(program, log_len, nullptr, log_buf.Allocate(log_len));
DEBUG(driver, result != GL_TRUE ? 0 : 2, "%s", log_buf.GetBuffer()); // Always print on failure.
}
return result == GL_TRUE;
}
/**
* Create all needed shader programs.
* @return True if successful, false otherwise.
*/
bool OpenGLBackend::InitShaders()
{
const char *ver = (const char *)glGetString(GL_SHADING_LANGUAGE_VERSION);
if (ver == nullptr) return false;
int glsl_major = ver[0] - '0';
int glsl_minor = ver[2] - '0';
bool glsl_150 = (IsOpenGLVersionAtLeast(3, 2) || glsl_major > 1 || (glsl_major == 1 && glsl_minor >= 5)) && _glBindFragDataLocation != nullptr;
/* Create vertex shader. */
GLuint vert_shader = _glCreateShader(GL_VERTEX_SHADER);
_glShaderSource(vert_shader, glsl_150 ? lengthof(_vertex_shader_direct_150) : lengthof(_vertex_shader_direct), glsl_150 ? _vertex_shader_direct_150 : _vertex_shader_direct, nullptr);
_glCompileShader(vert_shader);
if (!VerifyShader(vert_shader)) return false;
/* Create fragment shader for plain RGBA. */
GLuint frag_shader_rgb = _glCreateShader(GL_FRAGMENT_SHADER);
_glShaderSource(frag_shader_rgb, glsl_150 ? lengthof(_frag_shader_direct_150) : lengthof(_frag_shader_direct), glsl_150 ? _frag_shader_direct_150 : _frag_shader_direct, nullptr);
_glCompileShader(frag_shader_rgb);
if (!VerifyShader(frag_shader_rgb)) return false;
/* Create fragment shader for paletted only. */
GLuint frag_shader_pal = _glCreateShader(GL_FRAGMENT_SHADER);
_glShaderSource(frag_shader_pal, glsl_150 ? lengthof(_frag_shader_palette_150) : lengthof(_frag_shader_palette), glsl_150 ? _frag_shader_palette_150 : _frag_shader_palette, nullptr);
_glCompileShader(frag_shader_pal);
if (!VerifyShader(frag_shader_pal)) return false;
/* Link shaders to program. */
this->vid_program = _glCreateProgram();
_glAttachShader(this->vid_program, vert_shader);
_glAttachShader(this->vid_program, frag_shader_rgb);
this->pal_program = _glCreateProgram();
_glAttachShader(this->pal_program, vert_shader);
_glAttachShader(this->pal_program, frag_shader_pal);
if (glsl_150) {
/* Bind fragment shader outputs. */
_glBindFragDataLocation(this->vid_program, 0, "colour");
_glBindFragDataLocation(this->pal_program, 0, "colour");
}
_glLinkProgram(this->vid_program);
if (!VerifyProgram(this->vid_program)) return false;
_glLinkProgram(this->pal_program);
if (!VerifyProgram(this->pal_program)) return false;
_glDeleteShader(vert_shader);
_glDeleteShader(frag_shader_rgb);
_glDeleteShader(frag_shader_pal);
return true;
}
/**
* 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) return false;
int bpp = BlitterFactory::GetCurrentBlitter()->GetScreenDepth();
int pitch = bpp != 32 ? Align(w, 4) : w;
glViewport(0, 0, w, h);
/* Re-allocate video buffer texture and backing store. */
_glBindBuffer(GL_PIXEL_UNPACK_BUFFER, this->vid_pbo);
_glBufferData(GL_PIXEL_UNPACK_BUFFER, pitch * h * bpp / 8, nullptr, GL_DYNAMIC_READ); // Buffer content has to persist from frame to frame and is read back by the blitter, which means a READ usage hint.
_glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
_glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, this->vid_texture);
switch (bpp) {
case 8:
glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, w, h, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
break;
default:
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, w, h, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, nullptr);
break;
}
glBindTexture(GL_TEXTURE_2D, 0);
/* Set new viewport. */
_screen.height = h;
_screen.width = w;
_screen.pitch = pitch;
_screen.dst_ptr = nullptr;
return true;
}
/**
* Update the stored palette.
* @param pal Palette array with at least 256 elements.
* @param first First entry to update.
* @param length Number of entries to update.
*/
void OpenGLBackend::UpdatePalette(const Colour *pal, uint first, uint length)
{
assert(first + length <= 256);
glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
_glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
_glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_1D, this->pal_texture);
glTexSubImage1D(GL_TEXTURE_1D, 0, first, length, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, pal + first);
}
/**
* Render video buffer to the screen.
*/
void OpenGLBackend::Paint()
{
glClear(GL_COLOR_BUFFER_BIT);
/* Blit video buffer to screen. */
_glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, this->vid_texture);
_glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_1D, this->pal_texture);
_glUseProgram(BlitterFactory::GetCurrentBlitter()->GetScreenDepth() == 8 ? this->pal_program : this->vid_program);
_glBindVertexArray(this->vao_quad);
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
}
/**
* Get a pointer to the memory for the video driver to draw to.
* @return Pointer to draw on.
*/
void *OpenGLBackend::GetVideoBuffer()
{
_glBindBuffer(GL_PIXEL_UNPACK_BUFFER, this->vid_pbo);
return _glMapBuffer(GL_PIXEL_UNPACK_BUFFER, GL_READ_WRITE);
}
/**
* Update video buffer texture after the video buffer was filled.
* @param update_rect Rectangle encompassing the dirty region of the video buffer.
*/
void OpenGLBackend::ReleaseVideoBuffer(const Rect &update_rect)
{
assert(this->vid_pbo != 0);
_glBindBuffer(GL_PIXEL_UNPACK_BUFFER, this->vid_pbo);
_glUnmapBuffer(GL_PIXEL_UNPACK_BUFFER);
/* Update changed rect of the video buffer texture. */
if (!IsEmptyRect(update_rect)) {
_glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, this->vid_texture);
glPixelStorei(GL_UNPACK_ROW_LENGTH, _screen.pitch);
switch (BlitterFactory::GetCurrentBlitter()->GetScreenDepth()) {
case 8:
glTexSubImage2D(GL_TEXTURE_2D, 0, update_rect.left, update_rect.top, update_rect.right - update_rect.left, update_rect.bottom - update_rect.top, GL_RED, GL_UNSIGNED_BYTE, (GLvoid *)(size_t)(update_rect.top * _screen.pitch + update_rect.left));
break;
default:
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, (GLvoid *)(size_t)(update_rect.top * _screen.pitch * 4 + update_rect.left * 4));
break;
}
}
}
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