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#include "../utils/macros.h"
#include "jsl.h"
namespace jin
{
namespace render
{
//vec4 effect(vec4 color, Image texture, vec2 texture_coords, vec2 screen_coords)
static const char* base_f = " "
"#version 120 \n"
"#define number float \n"
"#define Image sampler2D \n"
"#define Canvas sampler2D \n"
"#define Color vec4 \n"
"#define Texel texture2D \n"
"#define extern uniform \n"
"uniform Image _tex0_; \n"
"%s \n"
"void main(){ \n"
"gl_FragColor = effect(gl_Color, _tex0_, gl_TexCoord[0].xy, gl_FragCoord.xy);\n"
"}\0";
shared GLint JSLProgram::currentTextureUnit = 0;
shared GLint JSLProgram::maxTextureUnits = -1;
shared JSLProgram* JSLProgram::currentJSLProgram = nullptr;
JSLProgram::JSLProgram(const char* program)
{
initialize(program);
}
JSLProgram::~JSLProgram()
{
destroy();
}
inline void JSLProgram::destroy()
{
if (currentJSLProgram == this)
unuse();
}
inline void JSLProgram::initialize(const char* program)
{
if (maxTextureUnits == -1)
glGetIntegerv(GL_MAX_TEXTURE_IMAGE_UNITS, &maxTextureUnits);
char* fs = (char*)alloca(strlen(program) + strlen(base_f));
sprintf(fs, base_f, program);
GLuint fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(fragmentShader, 1, (const GLchar**)&fs, NULL);
glCompileShader(fragmentShader);
pid = glCreateProgram();
glAttachShader(pid, fragmentShader);
glLinkProgram(pid);
}
GLint JSLProgram::getTextureUnit(const std::string& name)
{
std::map<std::string, GLint>::iterator texture_unit = texturePool.find(name);
if (texture_unit != texturePool.end())
return texture_unit->second;
if (++currentTextureUnit >= maxTextureUnits)
return 0;
texturePool[name] = currentTextureUnit;
return currentTextureUnit;
}
#define checkJSL() if (currentJSLProgram != this) return
void JSLProgram::sendFloat(const char* variable, float number)
{
checkJSL();
int loc = glGetUniformLocation(pid, variable);
glUniform1f(loc, number);
}
void JSLProgram::sendImage(const char* variable, const Image* image)
{
checkJSL();
GLint texture_unit = JSLProgram::getTextureUnit(variable);
GLint location = glGetUniformLocation(pid, variable);
glUniform1i(location, texture_unit);
glActiveTexture(GL_TEXTURE0 + texture_unit);
glBindTexture(GL_TEXTURE_2D, image->getTexture());
glActiveTexture(GL_TEXTURE0);
}
void JSLProgram::sendCanvas(const char* variable, const Canvas* canvas)
{
checkJSL();
GLint texture_unit = getTextureUnit(variable);
GLint location = glGetUniformLocation(pid, variable);
glUniform1i(location, texture_unit);
glActiveTexture(GL_TEXTURE0 + texture_unit);
glBindTexture(GL_TEXTURE_2D, canvas->getTexture());
glActiveTexture(GL_TEXTURE0);
}
void JSLProgram::sendVec2(const char* name, float x, float y)
{
checkJSL();
int loc = glGetUniformLocation(pid, name);
glUniform2f(loc, x, y);
}
void JSLProgram::sendVec3(const char* name, float x, float y, float z)
{
checkJSL();
int loc = glGetUniformLocation(pid, name);
glUniform3f(loc, x, y, z);
}
void JSLProgram::sendVec4(const char* name, float x, float y, float z, float w)
{
checkJSL();
int loc = glGetUniformLocation(pid, name);
glUniform4f(loc, x, y, z, w);
}
void JSLProgram::sendColor(const char* name, const color* col)
{
checkJSL();
int loc = glGetUniformLocation(pid, name);
glUniform4f(loc,
col->rgba.r / 255.f,
col->rgba.g / 255.f,
col->rgba.b / 255.f,
col->rgba.a / 255.f
);
}
}
}
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