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shader.cpp
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shader.cpp
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/* Shader
*
* Copyright (C) 2003-2004, Alexander Zaprjagaev <frustum@frustum.org>
*
* This program 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; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "engine.h"
#include "light.h"
#include "parser.h"
#include "shader.h"
/*
*/
Shader *Shader::old_shader;
vec4 Shader::parameters[NUM_PARAMETERS];
Texture *Shader::old_textures[NUM_TEXTURES];
/*
*/
Shader::Shader(const char *name) {
load(name);
}
Shader::~Shader() {
if(vertex_target == GL_VERTEX_PROGRAM_ARB) {
if(vertex_id) glDeleteProgramsARB(1,&vertex_id);
}
if(fragment_target == GL_FRAGMENT_PROGRAM_ARB) {
if(fragment_id) glDeleteProgramsARB(1,&fragment_id);
} else if(fragment_target == GL_FRAGMENT_PROGRAM_NV) {
if(fragment_id) glDeleteProgramsNV(1,&fragment_id);
} else if(fragment_target == GL_COMBINE) {
glDeleteLists(fragment_id,1);
}
}
/*****************************************************************************/
/* */
/* load shader */
/* */
/*****************************************************************************/
/*
*/
void Shader::load(const char *name) {
Parser *parser = new Parser(name);
// matrixes
num_matrixes = 0;
for(int i = 0; i < NUM_MATRIXES; i++) {
char buf[1024];
sprintf(buf,"matrix%d",i);
if(parser->get(buf)) {
matrixes[num_matrixes].num = i;
getMatrix(parser->get(buf),&matrixes[num_matrixes]);
num_matrixes++;
}
}
// vertex program local parameters
num_vertex_parameters = 0;
for(int i = 0; i < NUM_LOCAL_PARAMETERS; i++) {
char buf[1024];
sprintf(buf,"vertex_local%d",i);
if(parser->get(buf)) {
vertex_parameters[num_vertex_parameters].num = i;
getLocalParameter(parser->get(buf),&vertex_parameters[num_vertex_parameters]);
num_vertex_parameters++;
}
}
// fragement program local parameters
num_fragment_parameters = 0;
for(int i = 0; i < NUM_LOCAL_PARAMETERS; i++) {
char buf[1024];
sprintf(buf,"fragment_local%d",i);
if(parser->get(buf)) {
fragment_parameters[num_fragment_parameters].num = i;
getLocalParameter(parser->get(buf),&fragment_parameters[num_fragment_parameters]);
num_fragment_parameters++;
}
}
char *data;
// vertex program
vertex_target = 0;
vertex_id = 0;
if((data = parser->get("vertex"))) {
int error = -1;
if(!strncmp(data,"!!ARBvp1.0",10)) {
vertex_target = GL_VERTEX_PROGRAM_ARB;
glGenProgramsARB(1,&vertex_id);
glBindProgramARB(vertex_target,vertex_id);
glProgramStringARB(vertex_target,GL_PROGRAM_FORMAT_ASCII_ARB,strlen(data),data);
glGetIntegerv(GL_PROGRAM_ERROR_POSITION_ARB,&error);
} else {
char *s = data;
while(*s != '\0' && *s != '\n') s++;
*s = '\0';
fprintf(stderr,"Shader::Shader(): unknown vertex program header \"%s\" in \"%s\" file\n",data,name);
}
if(error != -1) {
int line = 0;
char *s = data;
while(error-- && *s) if(*s++ == '\n') line++;
while(s >= data && *s != '\n') s--;
char *e = ++s;
while(*e != '\0' && *e != '\n') e++;
*e = '\0';
fprintf(stderr,"Shader::Shader(): vertex program error in \"%s\" file at line %d:\n\"%s\"\n",name,line,s);
}
}
// fragment program
fragment_target = 0;
fragment_id = 0;
if((data = parser->get("fragment"))) {
int error = -1;
if(!strncmp(data,"!!ARBfp1.0",10)) {
fragment_target = GL_FRAGMENT_PROGRAM_ARB;
glGenProgramsARB(1,&fragment_id);
glBindProgramARB(fragment_target,fragment_id);
glProgramStringARB(fragment_target,GL_PROGRAM_FORMAT_ASCII_ARB,strlen(data),data);
glGetIntegerv(GL_PROGRAM_ERROR_POSITION_ARB,&error);
} else if(!strncmp(data,"!!FP1.0",7)) {
fragment_target = GL_FRAGMENT_PROGRAM_NV;
glGenProgramsNV(1,&fragment_id);
glBindProgramNV(fragment_target,fragment_id);
glLoadProgramNV(fragment_target,fragment_id,strlen(data),(GLubyte*)data);
glGetIntegerv(GL_PROGRAM_ERROR_POSITION_NV,&error);
} else if(!strncmp(data,"!!ARBtec1.0",11)) { // arb texture env combine
fragment_target = GL_COMBINE;
fragment_id = compileARBtec(data);
} else {
char *s = data;
while(*s != '\0' && *s != '\n') s++;
*s = '\0';
fprintf(stderr,"Shader::Shader(): unknown fragment program header \"%s\" in \"%s\" file\n",data,name);
}
if(error != -1) {
int line = 0;
char *s = data;
while(error-- && *s) if(*s++ == '\n') line++;
while(s >= data && *s != '\n') s--;
char *e = ++s;
while(*e != '\0' && *e != '\n') e++;
*e = '\0';
fprintf(stderr,"Shader::Shader(): fragment program error in \"%s\" file at line %d:\n\"%s\"\n",name,line,s);
}
}
delete parser;
}
/*
*/
GLuint Shader::compileARBtec(const char *src) {
const char *s = src;
GLuint list = glGenLists(1);
glNewList(list,GL_COMPILE);
if(strncmp("!!ARBtec1.0",s,11)) {
fprintf(stderr,"Shader::compileARBtec(): unknown header\n");
glEndList();
return list;
}
s += 11;
int unit = -1;
while(*s) {
if(*s == '#') while(*s && *s != '\n') s++;
else if(strchr(" \t\n\r",*s)) s++;
else if(!strncmp("END",s,3)) break;
else {
int sources = 0;
if(unit > 0) glActiveTexture(GL_TEXTURE0 + unit);
while(*s) {
if(strchr(" \t",*s)) s++;
else if(!strncmp("nop",s,3) && (s += 3)) {
if(++unit > 0) glActiveTexture(GL_TEXTURE0 + unit);
glTexEnvi(GL_TEXTURE_ENV,GL_TEXTURE_ENV_MODE,GL_MODULATE);
}
else if(!strncmp("replace",s,7) && (s += 7)) {
if(++unit > 0) glActiveTexture(GL_TEXTURE0 + unit);
glTexEnvi(GL_TEXTURE_ENV,GL_TEXTURE_ENV_MODE,GL_COMBINE);
glTexEnvi(GL_TEXTURE_ENV,GL_COMBINE_RGB,GL_REPLACE);
}
else if(!strncmp("modulate",s,8) && (s += 8)) {
if(++unit > 0) glActiveTexture(GL_TEXTURE0 + unit);
glTexEnvi(GL_TEXTURE_ENV,GL_TEXTURE_ENV_MODE,GL_COMBINE);
glTexEnvi(GL_TEXTURE_ENV,GL_COMBINE_RGB,GL_MODULATE);
}
else if(!strncmp("add",s,3) && (s += 3)) {
if(++unit > 0) glActiveTexture(GL_TEXTURE0 + unit);
glTexEnvi(GL_TEXTURE_ENV,GL_TEXTURE_ENV_MODE,GL_COMBINE);
glTexEnvi(GL_TEXTURE_ENV,GL_COMBINE_RGB,GL_ADD);
}
else if(!strncmp("add_signed",s,10) && (s += 10)) {
if(++unit > 0) glActiveTexture(GL_TEXTURE0 + unit);
glTexEnvi(GL_TEXTURE_ENV,GL_TEXTURE_ENV_MODE,GL_COMBINE);
glTexEnvi(GL_TEXTURE_ENV,GL_COMBINE_RGB,GL_ADD_SIGNED);
}
else if(!strncmp("sub",s,3) && (s += 3)) {
if(++unit > 0) glActiveTexture(GL_TEXTURE0 + unit);
glTexEnvi(GL_TEXTURE_ENV,GL_TEXTURE_ENV_MODE,GL_COMBINE);
glTexEnvi(GL_TEXTURE_ENV,GL_COMBINE_RGB,GL_SUBTRACT);
}
else if(!strncmp("dot3",s,4) && (s += 4)) {
if(++unit > 0) glActiveTexture(GL_TEXTURE0 + unit);
glTexEnvi(GL_TEXTURE_ENV,GL_TEXTURE_ENV_MODE,GL_COMBINE);
glTexEnvi(GL_TEXTURE_ENV,GL_COMBINE_RGB,GL_DOT3_RGB);
}
else if(!strncmp("primary",s,7) && (s += 7)) glTexEnvi(GL_TEXTURE_ENV,GL_SOURCE0_RGB + sources++,GL_PRIMARY_COLOR);
else if(!strncmp("texture0",s,8) && (s += 8)) glTexEnvi(GL_TEXTURE_ENV,GL_SOURCE0_RGB + sources++,GL_TEXTURE0);
else if(!strncmp("texture1",s,8) && (s += 8)) glTexEnvi(GL_TEXTURE_ENV,GL_SOURCE0_RGB + sources++,GL_TEXTURE1);
else if(!strncmp("texture2",s,8) && (s += 8)) glTexEnvi(GL_TEXTURE_ENV,GL_SOURCE0_RGB + sources++,GL_TEXTURE2);
else if(!strncmp("texture3",s,8) && (s += 8)) glTexEnvi(GL_TEXTURE_ENV,GL_SOURCE0_RGB + sources++,GL_TEXTURE3);
else if(!strncmp("texture",s,7) && (s += 7)) glTexEnvi(GL_TEXTURE_ENV,GL_SOURCE0_RGB + sources++,GL_TEXTURE0 + unit);
else if(!strncmp("previous",s,8) && (s += 8)) glTexEnvi(GL_TEXTURE_ENV,GL_SOURCE0_RGB + sources++,GL_PREVIOUS);
else if(!strncmp("scale2",s,6) && (s += 6)) glTexEnvi(GL_TEXTURE_ENV,GL_RGB_SCALE,2);
else if(!strncmp("scale4",s,6) && (s += 6)) glTexEnvi(GL_TEXTURE_ENV,GL_RGB_SCALE,4);
else if(*s == '\n' && s++) break;
else {
printf("%s\n",s);
char buf[1024];
char *d = buf;
while(*s && !strchr(" \t\n\r",*s)) *d++ = *s++;
*d = '\0';
fprintf(stderr,"Shader::compileARBtec(): unknown token \"%s\"\n",buf);
glEndList();
return list;
}
}
for(int i = 0; i < sources; i++) glTexEnvi(GL_TEXTURE_ENV,GL_OPERAND0_RGB + i,GL_SRC_COLOR);
}
}
if(unit > 1) glActiveTexture(GL_TEXTURE0);
glEndList();
return list;
}
/*
*/
void Shader::getMatrix(const char *name,Matrix *m) {
if(!strcmp(name,"projection")) m->type = PROJECTION;
else if(!strcmp(name,"modelview")) m->type = MODELVIEW;
else if(!strcmp(name,"imodelview")) m->type = IMODELVIEW;
else if(!strcmp(name,"transform")) m->type = TRANSFORM;
else if(!strcmp(name,"itransform")) m->type = ITRANSFORM;
else if(!strcmp(name,"light_transform")) m->type = LIGHT_TRANSFORM;
else fprintf(stderr,"Shader::getMatrix(): unknown matrix \"%s\"\n",name);
}
void Shader::getLocalParameter(const char *name,Shader::LocalParameter *p) {
if(!strcmp(name,"time")) p->type = TIME;
else if(!strcmp(name,"sin")) p->type = SIN;
else if(!strcmp(name,"cos")) p->type = COS;
else if(!strcmp(name,"camera")) p->type = CAMERA;
else if(!strcmp(name,"icamera")) p->type = ICAMERA;
else if(!strcmp(name,"light")) p->type = LIGHT;
else if(!strcmp(name,"ilight")) p->type = ILIGHT;
else if(!strcmp(name,"light_color")) p->type = LIGHT_COLOR;
else if(!strcmp(name,"fog_color")) p->type = FOG_COLOR;
else if(!strcmp(name,"viewport")) p->type = VIEWPORT;
else if(!strncmp(name,"parameter",9)) {
p->type = PARAMETER;
sscanf(name + 9,"%d",&p->parameter);
if(p->parameter >= NUM_PARAMETERS) {
fprintf(stderr,"Shader::getLocalParameter(): number of parameters is big\n");
p->parameter = 0;
}
}
else fprintf(stderr,"Shader::getLocalParameter(): unknown parameter \"%s\"\n",name);
}
/*
*/
void Shader::setParameter(int num,const vec4 ¶meter) {
parameters[num] = parameter;
}
/*****************************************************************************/
/* */
/* enable/disable/bind */
/* */
/*****************************************************************************/
/*
*/
void Shader::enable() {
if(old_shader == this) return;
if(old_shader) {
if(old_shader->vertex_target != vertex_target) {
if(old_shader->vertex_target) glDisable(old_shader->vertex_target);
if(vertex_target) glEnable(vertex_target);
}
if(old_shader->fragment_target != fragment_target) {
if(old_shader->fragment_target == GL_FRAGMENT_PROGRAM_ARB) glDisable(old_shader->fragment_target);
else if(old_shader->fragment_target == GL_FRAGMENT_PROGRAM_NV) glDisable(old_shader->fragment_target);
else if(old_shader->fragment_target == GL_COMBINE) {
glActiveTexture(GL_TEXTURE0);
glTexEnvi(GL_TEXTURE_ENV,GL_TEXTURE_ENV_MODE,GL_MODULATE);
glActiveTexture(GL_TEXTURE1);
glTexEnvi(GL_TEXTURE_ENV,GL_TEXTURE_ENV_MODE,GL_MODULATE);
glActiveTexture(GL_TEXTURE2);
glTexEnvi(GL_TEXTURE_ENV,GL_TEXTURE_ENV_MODE,GL_MODULATE);
glActiveTexture(GL_TEXTURE3);
glTexEnvi(GL_TEXTURE_ENV,GL_TEXTURE_ENV_MODE,GL_MODULATE);
glActiveTexture(GL_TEXTURE0);
}
if(fragment_target == GL_FRAGMENT_PROGRAM_ARB) glEnable(fragment_target);
else if(fragment_target == GL_FRAGMENT_PROGRAM_NV) glEnable(fragment_target);
}
} else {
if(vertex_target) glEnable(vertex_target);
if(fragment_target == GL_FRAGMENT_PROGRAM_ARB) glEnable(fragment_target);
else if(fragment_target == GL_FRAGMENT_PROGRAM_NV) glEnable(fragment_target);
}
}
/*
*/
void Shader::disable() {
if(vertex_target) glDisable(vertex_target);
if(fragment_target == GL_FRAGMENT_PROGRAM_ARB) glDisable(fragment_target);
else if(fragment_target == GL_FRAGMENT_PROGRAM_NV) glDisable(fragment_target);
else if(fragment_target == GL_COMBINE) {
glActiveTexture(GL_TEXTURE0);
glTexEnvi(GL_TEXTURE_ENV,GL_TEXTURE_ENV_MODE,GL_MODULATE);
glActiveTexture(GL_TEXTURE1);
glTexEnvi(GL_TEXTURE_ENV,GL_TEXTURE_ENV_MODE,GL_MODULATE);
glActiveTexture(GL_TEXTURE2);
glTexEnvi(GL_TEXTURE_ENV,GL_TEXTURE_ENV_MODE,GL_MODULATE);
glActiveTexture(GL_TEXTURE3);
glTexEnvi(GL_TEXTURE_ENV,GL_TEXTURE_ENV_MODE,GL_MODULATE);
}
for(int i = 0; i < NUM_TEXTURES; i++) {
if(old_textures[i]) {
glActiveTexture(GL_TEXTURE0 + i);
old_textures[i]->disable();
}
old_textures[i] = NULL;
}
glActiveTexture(GL_TEXTURE0);
old_shader = NULL;
}
/*
*/
void Shader::bind() {
if(old_shader != this) {
if(vertex_target == GL_VERTEX_PROGRAM_ARB) glBindProgramARB(vertex_target,vertex_id);
if(fragment_target == GL_FRAGMENT_PROGRAM_ARB) glBindProgramARB(fragment_target,fragment_id);
else if(fragment_target == GL_FRAGMENT_PROGRAM_NV) glBindProgramNV(fragment_target,fragment_id);
else if(fragment_target == GL_COMBINE) glCallList(fragment_id);
old_shader = this;
}
for(int i = 0; i < num_matrixes; i++) {
glMatrixMode(GL_MATRIX0_ARB + matrixes[i].num);
if(matrixes[i].type == PROJECTION) glLoadMatrixf(Engine::projection);
else if(matrixes[i].type == MODELVIEW) glLoadMatrixf(Engine::modelview);
else if(matrixes[i].type == IMODELVIEW) glLoadMatrixf(Engine::imodelview);
else if(matrixes[i].type == TRANSFORM) glLoadMatrixf(Engine::transform);
else if(matrixes[i].type == ITRANSFORM) glLoadMatrixf(Engine::itransform);
else if(matrixes[i].type == LIGHT_TRANSFORM && Engine::current_light) glLoadMatrixf(Engine::current_light->transform);
}
if(num_matrixes) glMatrixMode(GL_MODELVIEW);
for(int i = 0; i < num_vertex_parameters; i++) {
if(vertex_parameters[i].type == TIME) glProgramLocalParameter4fvARB(vertex_target,vertex_parameters[i].num,vec4(Engine::time,Engine::time / 2.0f,Engine::time / 3.0f,Engine::time / 5.0f));
else if(vertex_parameters[i].type == SIN) glProgramLocalParameter4fvARB(vertex_target,vertex_parameters[i].num,vec4(sin(Engine::time),sin(Engine::time / 2.0f),sin(Engine::time / 3.0f),sin(Engine::time / 5.0f)));
else if(vertex_parameters[i].type == COS) glProgramLocalParameter4fvARB(vertex_target,vertex_parameters[i].num,vec4(cos(Engine::time),cos(Engine::time / 2.0f),cos(Engine::time / 3.0f),cos(Engine::time / 5.0f)));
else if(vertex_parameters[i].type == CAMERA) glProgramLocalParameter4fvARB(vertex_target,vertex_parameters[i].num,vec4(Engine::camera,1));
else if(vertex_parameters[i].type == ICAMERA) glProgramLocalParameter4fvARB(vertex_target,vertex_parameters[i].num,vec4(Engine::itransform * Engine::camera,1));
else if(vertex_parameters[i].type == LIGHT) glProgramLocalParameter4fvARB(vertex_target,vertex_parameters[i].num,Engine::light);
else if(vertex_parameters[i].type == ILIGHT) glProgramLocalParameter4fvARB(vertex_target,vertex_parameters[i].num,vec4(Engine::itransform * vec3(Engine::light),Engine::light.w));
else if(vertex_parameters[i].type == LIGHT_COLOR) glProgramLocalParameter4fvARB(vertex_target,vertex_parameters[i].num,Engine::light_color);
else if(vertex_parameters[i].type == FOG_COLOR) glProgramLocalParameter4fvARB(vertex_target,vertex_parameters[i].num,Engine::fog_color);
else if(vertex_parameters[i].type == VIEWPORT) glProgramLocalParameter4fvARB(vertex_target,vertex_parameters[i].num,vec4(Engine::viewport[0],Engine::viewport[1],Engine::viewport[2],Engine::viewport[3]));
else if(vertex_parameters[i].type == PARAMETER) glProgramLocalParameter4fvARB(vertex_target,vertex_parameters[i].num,parameters[vertex_parameters[i].parameter]);
}
for(int i = 0; i < num_fragment_parameters; i++) {
if(vertex_parameters[i].type == TIME) glProgramLocalParameter4fvARB(fragment_target,fragment_parameters[i].num,vec4(Engine::time,Engine::time / 2.0f,Engine::time / 3.0f,Engine::time / 5.0f));
else if(vertex_parameters[i].type == SIN) glProgramLocalParameter4fvARB(fragment_target,fragment_parameters[i].num,vec4(sin(Engine::time),sin(Engine::time / 2.0f),sin(Engine::time / 3.0f),sin(Engine::time / 5.0f)));
else if(vertex_parameters[i].type == COS) glProgramLocalParameter4fvARB(fragment_target,fragment_parameters[i].num,vec4(cos(Engine::time),cos(Engine::time / 2.0f),cos(Engine::time / 3.0f),cos(Engine::time / 5.0f)));
else if(fragment_parameters[i].type == CAMERA) glProgramLocalParameter4fvARB(fragment_target,fragment_parameters[i].num,vec4(Engine::camera,1));
else if(fragment_parameters[i].type == ICAMERA) glProgramLocalParameter4fvARB(fragment_target,fragment_parameters[i].num,vec4(Engine::itransform * Engine::camera,1));
else if(fragment_parameters[i].type == LIGHT) glProgramLocalParameter4fvARB(fragment_target,fragment_parameters[i].num,Engine::light);
else if(fragment_parameters[i].type == ILIGHT) glProgramLocalParameter4fvARB(fragment_target,fragment_parameters[i].num,vec4(Engine::itransform * vec3(Engine::light),Engine::light.w));
else if(fragment_parameters[i].type == LIGHT_COLOR) glProgramLocalParameter4fvARB(fragment_target,fragment_parameters[i].num,Engine::light_color);
else if(fragment_parameters[i].type == FOG_COLOR) glProgramLocalParameter4fvARB(fragment_target,fragment_parameters[i].num,Engine::fog_color);
else if(fragment_parameters[i].type == VIEWPORT) glProgramLocalParameter4fvARB(fragment_target,fragment_parameters[i].num,vec4(Engine::viewport[0],Engine::viewport[1],Engine::viewport[2],Engine::viewport[3]));
else if(fragment_parameters[i].type == PARAMETER) glProgramLocalParameter4fvARB(fragment_target,fragment_parameters[i].num,parameters[fragment_parameters[i].parameter]);
}
}
/*****************************************************************************/
/* */
/* bind texture */
/* */
/*****************************************************************************/
/*
*/
void Shader::bindTexture(int unit,Texture *texture) {
if(old_textures[unit] == texture) return;
glActiveTexture(GL_TEXTURE0 + unit);
if(texture) {
if(old_textures[unit] == NULL) texture->enable();
else if(texture->target != old_textures[unit]->target) {
old_textures[unit]->disable();
texture->enable();
}
texture->bind();
} else {
if(old_textures[unit]) old_textures[unit]->disable();
}
old_textures[unit] = texture;
}