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354 lines (285 loc) · 10.7 KB
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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;
PFNGLUSEPROGRAMPROC glUseProgram = 0;
PFNGLCREATESHADERPROC glCreateShader = 0;
PFNGLDELETESHADERPROC glDeleteShader = 0;
PFNGLSHADERSOURCEPROC glShaderSource = 0;
PFNGLCOMPILESHADERPROC glCompileShader = 0;
PFNGLATTACHSHADERPROC glAttachShader = 0;
PFNGLDETACHSHADERPROC glDetachShader = 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);
glClear(GL_COLOR_BUFFER_BIT);
glFlush();
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 && (fragmentshader || vertexshader)) {
glUseProgram(glprogram);
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
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();
glFlush();
glErrorCheck();
if (shader_support) {
glUseProgram(0);
}
}
void OpenGL::set_shader(const char *source_yaml_filename) {
if (!shader_support) return;
if (fragmentshader) {
glDetachShader(glprogram, fragmentshader);
glDeleteShader(fragmentshader);
fragmentshader = 0;
}
if (vertexshader) {
glDetachShader(glprogram, vertexshader);
glDeleteShader(vertexshader);
vertexshader = 0;
}
if (source_yaml_filename && strlen(source_yaml_filename)) {
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());
}
}
glLinkProgram(glprogram);
}
void OpenGL::set_fragment_shader(const char *source) {
fragmentshader = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(fragmentshader, 1, &source, 0);
glCompileShader(fragmentshader);
glAttachShader(glprogram, fragmentshader);
}
void OpenGL::set_vertex_shader(const char *source) {
vertexshader = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(vertexshader, 1, &source, 0);
glCompileShader(vertexshader);
glAttachShader(glprogram, 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);
//enable useful and required features
glEnable(GL_DITHER);
glEnable(GL_TEXTURE_2D);
//bind shader functions
#ifndef __APPLE__
glCreateProgram = (PFNGLCREATEPROGRAMPROC)glGetProcAddress("glCreateProgram");
glUseProgram = (PFNGLUSEPROGRAMPROC)glGetProcAddress("glUseProgram");
glCreateShader = (PFNGLCREATESHADERPROC)glGetProcAddress("glCreateShader");
glDeleteShader = (PFNGLDELETESHADERPROC)glGetProcAddress("glDeleteShader");
glShaderSource = (PFNGLSHADERSOURCEPROC)glGetProcAddress("glShaderSource");
glCompileShader = (PFNGLCOMPILESHADERPROC)glGetProcAddress("glCompileShader");
glAttachShader = (PFNGLATTACHSHADERPROC)glGetProcAddress("glAttachShader");
glDetachShader = (PFNGLDETACHSHADERPROC)glGetProcAddress("glDetachShader");
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 && glUseProgram && glCreateShader
&& glDeleteShader && glShaderSource && glCompileShader && glAttachShader
&& glDetachShader && glLinkProgram && glGetUniformLocation
&& glUniform1i && glUniform2fv && glUniform4fv;
if (shader_support) glprogram = glCreateProgram();
//create surface texture
resize(w, h);
}
void OpenGL::setVSync(bool sync)
{
const int interval = sync ? 1 : 0;
if (glXGetCurrentDisplay && glXGetCurrentDrawable && glXSwapIntervalEXT)
{
void *dpy = glXGetCurrentDisplay();
Uint32 drawable = glXGetCurrentDrawable();
if (drawable) {
glXSwapIntervalEXT(dpy, drawable, interval);
// Log(LOG_INFO) << "Made an attempt to set vsync via GLX.";
}
} else if (wglSwapIntervalEXT)
{
wglSwapIntervalEXT(interval);
// Log(LOG_INFO) << "Made an attempt to set vsync via WGL.";
}
}
void OpenGL::term() {
if (gltexture) {
glDeleteTextures(1, &gltexture);
gltexture = 0;
}
if (buffer) {
buffer = 0;
iwidth = 0;
iheight = 0;
}
delete buffer_surface;
}
OpenGL::OpenGL() : gltexture(0), glprogram(0), fragmentshader(0), linear(false), vertexshader(0),
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