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// This file was copied from the bsnes project.
// This is the license info, from ruby.hpp:
/*
ruby
version: 0.08 (2011-11-25)
license: public domain
*/
#ifndef __NO_OPENGL
#include <SDL.h>
#include <SDL_opengl.h>
#include <yaml-cpp/yaml.h>
#include <fstream>
#include "OpenGL.h"
#include "Logger.h"
#include "Surface.h"
namespace OpenXcom
{
bool OpenGL::checkErrors = true;
std::string strGLError(GLenum glErr)
{
std::string err;
switch(glErr)
{
case GL_INVALID_ENUM:
err = "GL_INVALID_ENUM";
break;
case GL_INVALID_VALUE:
err = "GL_INVALID_VALUE";
break;
case GL_INVALID_OPERATION:
err = "GL_INVALID_OPERATION";
break;
case GL_STACK_OVERFLOW:
err = "GL_STACK_OVERFLOW";
break;
case GL_STACK_UNDERFLOW:
err = "GL_STACK_UNDERFLOW";
break;
case GL_OUT_OF_MEMORY:
err = "GL_OUT_OF_MEMORY";
break;
case GL_NO_ERROR:
err = "No error! How did you even reach this code?";
break;
default:
err = "Unknown error code!";
break;
}
return err;
}
/* Helper types to convert between object pointers and function pointers.
Although ignored by some compilers, this conversion is an extension
and not guaranteed to be sane for every architecture.
*/
typedef void (*GenericFunctionPointer)();
typedef union
{
GenericFunctionPointer FunctionPointer;
void *ObjectPointer;
} UnsafePointerContainer;
inline static GenericFunctionPointer glGetProcAddress(const char *name)
{
UnsafePointerContainer pc;
pc.ObjectPointer = SDL_GL_GetProcAddress(name);
return pc.FunctionPointer;
}
#ifndef __APPLE__
PFNGLCREATEPROGRAMPROC glCreateProgram = 0;
PFNGLDELETEPROGRAMPROC glDeleteProgram = 0;
PFNGLUSEPROGRAMPROC glUseProgram = 0;
PFNGLISPROGRAMPROC glIsProgram = 0;
PFNGLISSHADERPROC glIsShader = 0;
PFNGLCREATESHADERPROC glCreateShader = 0;
PFNGLDELETESHADERPROC glDeleteShader = 0;
PFNGLSHADERSOURCEPROC glShaderSource = 0;
PFNGLCOMPILESHADERPROC glCompileShader = 0;
PFNGLATTACHSHADERPROC glAttachShader = 0;
PFNGLDETACHSHADERPROC glDetachShader = 0;
PFNGLGETATTACHEDSHADERSPROC glGetAttachedShaders = 0;
PFNGLGETPROGRAMINFOLOGPROC glGetProgramInfoLog = 0;
PFNGLGETPROGRAMIVPROC glGetProgramiv = 0;
PFNGLGETSHADERINFOLOGPROC glGetShaderInfoLog = 0;
PFNGLGETSHADERIVPROC glGetShaderiv = 0;
PFNGLLINKPROGRAMPROC glLinkProgram = 0;
PFNGLGETUNIFORMLOCATIONPROC glGetUniformLocation = 0;
PFNGLUNIFORM1IPROC glUniform1i = 0;
PFNGLUNIFORM2FVPROC glUniform2fv = 0;
PFNGLUNIFORM4FVPROC glUniform4fv = 0;
#endif
void * (APIENTRYP glXGetCurrentDisplay)() = 0;
Uint32 (APIENTRYP glXGetCurrentDrawable)() = 0;
void (APIENTRYP glXSwapIntervalEXT)(void *display, Uint32 GLXDrawable, int interval);
Uint32 (APIENTRYP wglSwapIntervalEXT)(int interval);
void OpenGL::resize(unsigned width, unsigned height)
{
if (gltexture == 0)
{
glGenTextures(1, &gltexture);
glErrorCheck();
}
iwidth = width;
iheight = height;
if (buffer_surface) delete buffer_surface;
buffer_surface = new Surface(iwidth, iheight, 0, 0, ibpp); // use OpenXcom's Surface class to get an aligned buffer with bonus SDL_Surface
buffer = (uint32_t*) buffer_surface->getSurface()->pixels;
glBindTexture(GL_TEXTURE_2D, gltexture);
glErrorCheck();
glPixelStorei(GL_UNPACK_ROW_LENGTH, iwidth);
glErrorCheck();
glTexImage2D(GL_TEXTURE_2D,
/* mip-map level = */ 0, /* internal format = */ GL_RGB16_EXT,
width, height, /* border = */ 0, /* format = */ GL_BGRA,
iformat, buffer);
glErrorCheck();
}
bool OpenGL::lock(uint32_t *&data, unsigned &pitch)
{
pitch = iwidth * ibpp;
return (data = buffer);
}
void OpenGL::clear() {
//memset(buffer, 0, iwidth * iheight * ibpp);
glClearColor(0.0, 0.0, 0.0, 1.0);
glErrorCheck();
glClear(GL_COLOR_BUFFER_BIT);
glErrorCheck();
}
void OpenGL::refresh(bool smooth, unsigned inwidth, unsigned inheight, unsigned outwidth, unsigned outheight, int topBlackBand, int bottomBlackBand, int leftBlackBand, int rightBlackBand)
{
while (glGetError() != GL_NO_ERROR); // clear possible error from who knows where
clear();
if (shader_support && glprogram)
{
glUseProgram(glprogram);
glErrorCheck();
GLint location;
float inputSize[2] = { (float)inwidth, (float)inheight };
location = glGetUniformLocation(glprogram, "rubyInputSize");
glUniform2fv(location, 1, inputSize);
float outputSize[2] = { (float)outwidth, (float)outheight };
location = glGetUniformLocation(glprogram, "rubyOutputSize");
glUniform2fv(location, 1, outputSize);
float textureSize[2] = { (float)iwidth, (float)iheight };
location = glGetUniformLocation(glprogram, "rubyTextureSize");
glUniform2fv(location, 1, textureSize);
glErrorCheck();
}
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, smooth ? GL_LINEAR : GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, smooth ? GL_LINEAR : GL_NEAREST);
glErrorCheck();
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0, outwidth, 0, outheight, -1.0, 1.0);
glViewport(0, 0, outwidth, outheight);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glErrorCheck();
glPixelStorei(GL_UNPACK_ROW_LENGTH, buffer_surface->getSurface()->pitch / buffer_surface->getSurface()->format->BytesPerPixel);
glErrorCheck();
glTexSubImage2D(GL_TEXTURE_2D,
/* mip-map level = */ 0, /* x = */ 0, /* y = */ 0,
iwidth, iheight, GL_BGRA, iformat, buffer);
//OpenGL projection sets 0,0 as *bottom-left* of screen.
//therefore, below vertices flip image to support top-left source.
//texture range = x1:0.0, y1:0.0, x2:1.0, y2:1.0
//vertex range = x1:0, y1:0, x2:width, y2:height
if (leftBlackBand + rightBlackBand + topBlackBand + bottomBlackBand == 0)
{
double w = double(inwidth) / double(iwidth) * 2;
double h = double(inheight) / double(iheight) * 2;
int u1 = 0;
int u2 = outwidth * 2;
int v1 = outheight;
int v2 = - outheight;
glBegin(GL_TRIANGLES);
glTexCoord2f(0, 0); glVertex3i(u1, v1, 0);
glTexCoord2f(w, 0); glVertex3i(u2, v1, 0);
glTexCoord2f(0, h); glVertex3i(u1, v2, 0);
glEnd();
}
else
{
double w = double(inwidth) / double(iwidth);
double h = double(inheight) / double(iheight);
int u1 = leftBlackBand;
int u2 = outwidth - rightBlackBand;
int v1 = outheight - topBlackBand;
int v2 = bottomBlackBand;
glBegin(GL_TRIANGLE_STRIP);
glTexCoord2f(0, 0); glVertex3i(u1, v1, 0);
glTexCoord2f(w, 0); glVertex3i(u2, v1, 0);
glTexCoord2f(0, h); glVertex3i(u1, v2, 0);
glTexCoord2f(w, h); glVertex3i(u2, v2, 0);
glEnd();
}
glErrorCheck();
if (shader_support)
{
glUseProgram(0);
glErrorCheck();
}
}
bool OpenGL::set_shader(const char *source_yaml_filename)
{
if (!shader_support) return false;
if (glprogram)
{
glDeleteProgram(glprogram);
glprogram = 0;
}
if (source_yaml_filename && strlen(source_yaml_filename))
{
glprogram = glCreateProgram();
if (glprogram == 0)
{
Log(LOG_ERROR) << "Failed to create GLSL shader program";
return false;
}
try
{
YAML::Node document = YAML::LoadFile(source_yaml_filename);
bool is_glsl;
std::string language = document["language"].as<std::string>();
is_glsl = (language == "GLSL");
linear = document["linear"].as<bool>(false); // some shaders want texture linear interpolation and some don't
std::string fragment_source = document["fragment"].as<std::string>("");
std::string vertex_source = document["vertex"].as<std::string>("");
if (is_glsl)
{
if (!fragment_source.empty()) set_fragment_shader(fragment_source.c_str());
if (!vertex_source.empty()) set_vertex_shader(vertex_source.c_str());
}
else
{
Log(LOG_ERROR) << "Unexpected shader language \"" <<
document["language"].as<std::string>() << "\"";
}
}
catch (YAML::Exception &e)
{
Log(LOG_ERROR) << source_yaml_filename << ": " << e.what();
glDeleteProgram(glprogram);
glprogram = 0;
return false;
}
glLinkProgram(glprogram);
glErrorCheck();
GLint linkStatus;
glGetProgramiv(glprogram, GL_LINK_STATUS, &linkStatus);
glErrorCheck();
if (linkStatus != GL_TRUE)
{
GLint infoLogLength;
glGetProgramiv(glprogram, GL_INFO_LOG_LENGTH, &infoLogLength);
glErrorCheck();
if (infoLogLength == 0)
{
Log(LOG_ERROR) << "OpenGL shader link failed: No log returned from driver";
}
else
{
GLchar *infoLog = new GLchar[infoLogLength];
glGetProgramInfoLog(glprogram, infoLogLength, NULL, infoLog);
glErrorCheck();
Log(LOG_ERROR) << "OpenGL shader link failed \"" << infoLog << "\"";
delete[] infoLog;
}
glDeleteProgram(glprogram);
glErrorCheck();
glprogram = 0;
}
}
return glprogram != 0;
}
static GLuint createShader(GLenum type, const char *source)
{
GLuint shader = glCreateShader(type);
glErrorCheck();
glShaderSource(shader, 1, &source, 0);
glErrorCheck();
glCompileShader(shader);
glErrorCheck();
GLint compileSuccess;
glGetShaderiv(shader, GL_COMPILE_STATUS, &compileSuccess);
glErrorCheck();
if (compileSuccess != GL_TRUE)
{
GLint infoLogLength;
glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &infoLogLength);
glErrorCheck();
if (infoLogLength == 0)
{
Log(LOG_ERROR) << "OpenGL shader compilation failed: No log returned from driver";
}
else
{
GLchar *infoLog = new GLchar[infoLogLength];
glGetShaderInfoLog(shader, infoLogLength, NULL, infoLog);
glErrorCheck();
Log(LOG_ERROR) << "OpenGL shader compilation failed: \"" << infoLog << "\"";
delete[] infoLog;
}
glDeleteShader(shader);
glErrorCheck();
shader = 0;
}
return shader;
}
void OpenGL::set_fragment_shader(const char *source)
{
GLint fragmentshader = createShader(GL_FRAGMENT_SHADER, source);
if (fragmentshader)
{
glAttachShader(glprogram, fragmentshader);
glErrorCheck();
glDeleteShader(fragmentshader);
}
}
void OpenGL::set_vertex_shader(const char *source)
{
GLint vertexshader = createShader(GL_VERTEX_SHADER, source);
if (vertexshader)
{
glAttachShader(glprogram, vertexshader);
glErrorCheck();
glDeleteShader(vertexshader);
}
}
void OpenGL::init(int w, int h)
{
//disable unused features
glDisable(GL_ALPHA_TEST);
glDisable(GL_BLEND);
glDisable(GL_DEPTH_TEST);
glDisable(GL_POLYGON_SMOOTH);
glDisable(GL_STENCIL_TEST);
glErrorCheck();
//enable useful and required features
glEnable(GL_DITHER);
glEnable(GL_TEXTURE_2D);
glErrorCheck();
//bind shader functions
#ifndef __APPLE__
glCreateProgram = (PFNGLCREATEPROGRAMPROC)glGetProcAddress("glCreateProgram");
glDeleteProgram = (PFNGLDELETEPROGRAMPROC)glGetProcAddress("glDeleteProgram");
glUseProgram = (PFNGLUSEPROGRAMPROC)glGetProcAddress("glUseProgram");
glIsProgram = (PFNGLISPROGRAMPROC)glGetProcAddress("glIsProgram");
glIsShader = (PFNGLISSHADERPROC)glGetProcAddress("glIsShader");
glCreateShader = (PFNGLCREATESHADERPROC)glGetProcAddress("glCreateShader");
glDeleteShader = (PFNGLDELETESHADERPROC)glGetProcAddress("glDeleteShader");
glShaderSource = (PFNGLSHADERSOURCEPROC)glGetProcAddress("glShaderSource");
glCompileShader = (PFNGLCOMPILESHADERPROC)glGetProcAddress("glCompileShader");
glAttachShader = (PFNGLATTACHSHADERPROC)glGetProcAddress("glAttachShader");
glDetachShader = (PFNGLDETACHSHADERPROC)glGetProcAddress("glDetachShader");
glGetAttachedShaders = (PFNGLGETATTACHEDSHADERSPROC)glGetProcAddress("glGetAttachedShaders");
glGetProgramiv = (PFNGLGETPROGRAMIVPROC)glGetProcAddress("glGetProgramiv");
glGetProgramInfoLog = (PFNGLGETPROGRAMINFOLOGPROC)glGetProcAddress("glGetProgramInfoLog");
glGetShaderiv = (PFNGLGETSHADERIVPROC)glGetProcAddress("glGetShaderiv");
glGetShaderInfoLog = (PFNGLGETSHADERINFOLOGPROC)glGetProcAddress("glGetShaderInfoLog");
glLinkProgram = (PFNGLLINKPROGRAMPROC)glGetProcAddress("glLinkProgram");
glGetUniformLocation = (PFNGLGETUNIFORMLOCATIONPROC)glGetProcAddress("glGetUniformLocation");
glUniform1i = (PFNGLUNIFORM1IPROC)glGetProcAddress("glUniform1i");
glUniform2fv = (PFNGLUNIFORM2FVPROC)glGetProcAddress("glUniform2fv");
glUniform4fv = (PFNGLUNIFORM4FVPROC)glGetProcAddress("glUniform4fv");
#endif
glXGetCurrentDisplay = (void* (APIENTRYP)())glGetProcAddress("glXGetCurrentDisplay");
glXGetCurrentDrawable = (Uint32 (APIENTRYP)())glGetProcAddress("glXGetCurrentDrawable");
glXSwapIntervalEXT = (void (APIENTRYP)(void*, Uint32, int))glGetProcAddress("glXSwapIntervalEXT");
wglSwapIntervalEXT = (Uint32 (APIENTRYP)(int))glGetProcAddress("wglSwapIntervalEXT");
shader_support = &glCreateProgram && &glDeleteProgram && &glUseProgram && &glCreateShader
&& &glDeleteShader && &glShaderSource && &glCompileShader && &glAttachShader
&& &glDetachShader && &glLinkProgram && &glGetUniformLocation && &glIsProgram && &glIsShader
&& &glUniform1i && &glUniform2fv && &glUniform4fv && &glGetAttachedShaders
&& &glGetShaderiv && &glGetShaderInfoLog && &glGetProgramiv && &glGetProgramInfoLog;
if (shader_support)
{
if (glprogram) {
if (glIsProgram(glprogram))
{
glDeleteProgram(glprogram);
glErrorCheck();
}
}
glprogram = glCreateProgram();
glErrorCheck();
}
//create surface texture
resize(w, h);
}
void OpenGL::setVSync(bool sync)
{
const int interval = sync ? 1 : 0;
if (glXGetCurrentDisplay && glXGetCurrentDrawable && glXSwapIntervalEXT)
{
void *dpy = glXGetCurrentDisplay();
glErrorCheck();
Uint32 drawable = glXGetCurrentDrawable();
glErrorCheck();
if (drawable) {
glXSwapIntervalEXT(dpy, drawable, interval);
glErrorCheck();
// Log(LOG_INFO) << "Made an attempt to set vsync via GLX.";
}
} else if (wglSwapIntervalEXT)
{
wglSwapIntervalEXT(interval);
glErrorCheck();
// Log(LOG_INFO) << "Made an attempt to set vsync via WGL.";
}
}
void OpenGL::term()
{
if (gltexture) {
glDeleteTextures(1, &gltexture);
glErrorCheck();
gltexture = 0;
}
if (glprogram) {
glDeleteProgram(glprogram);
glprogram = 0;
}
if (buffer) {
buffer = 0;
iwidth = 0;
iheight = 0;
}
delete buffer_surface;
}
OpenGL::OpenGL() : gltexture(0), glprogram(0), linear(false),
buffer(NULL), buffer_surface(NULL), iwidth(0), iheight(0),
iformat(GL_UNSIGNED_INT_8_8_8_8_REV), // this didn't seem to be set anywhere before...
ibpp(32) // ...nor this
{ }
OpenGL::~OpenGL()
{
term();
}
}
#endif