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Copy pathOpenGL.cpp
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341 lines (272 loc) · 9.88 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
*/
#include <SDL.h>
#include <SDL_opengl.h>
#include <yaml-cpp/yaml.h>
#include <iostream>
#include <fstream>
#include "OpenGL.h"
#include "Logger.h"
namespace OpenXcom
{
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;
}
#define glGetProcAddress(name) SDL_GL_GetProcAddress(name)
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;
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 = SDL_max(width, iwidth );
iheight = SDL_max(height, iheight);
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();
}
void OpenGL::refresh(bool smooth, unsigned inwidth, unsigned inheight, unsigned outwidth, unsigned outheight) {
while (glGetError() != GL_NO_ERROR); // clear possible error from who knows where
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 u = outwidth;
int v = outheight;
glBegin(GL_TRIANGLE_STRIP);
glTexCoord2f(0, 0); glVertex3i(0, v, 0);
glTexCoord2f(w, 0); glVertex3i(u, v, 0);
glTexCoord2f(0, h); glVertex3i(0, 0, 0);
glTexCoord2f(w, h); glVertex3i(u, 0, 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) {
std::ifstream fin(source_yaml_filename);
YAML::Parser parser(fin);
YAML::Node document;
parser.GetNextDocument(document);
bool is_glsl;
std::string s;
document["language"] >> s;
is_glsl = (s == "GLSL");
document["linear"] >> linear; // seemingly pointless!
std::string fragment_source;
std::string vertex_source;
if (const YAML::Node *pFrag = document.FindValue("fragment")) *pFrag >> fragment_source;
if (const YAML::Node *pVert = document.FindValue("vertex")) *pVert >> vertex_source;
if(is_glsl) {
if(fragment_source != "") set_fragment_shader(fragment_source.c_str());
if(vertex_source != "") 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
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");
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)
{
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) {
delete[] buffer;
buffer = 0;
iwidth = 0;
iheight = 0;
}
}
OpenGL::OpenGL() {
gltexture = 0;
glprogram = 0;
fragmentshader = 0;
linear = 0;
vertexshader = 0;
buffer = 0;
iwidth = 0;
iheight = 0;
ibpp = 32; // this didn't seem to be set anywhere before...
iformat = GL_UNSIGNED_INT_8_8_8_8_REV; // nor this
buffer_surface = 0;
}
}