1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/shaders.cc	Sat Dec 15 23:43:03 2012 +0200
     1.3 @@ -0,0 +1,297 @@
     1.4 +#include <stdio.h>
     1.5 +#include <assert.h>
     1.6 +#include <map>
     1.7 +#ifdef _MSC_VER
     1.8 +#include <memory.h>
     1.9 +#else
    1.10 +#include <alloca.h>
    1.11 +#endif
    1.12 +#include <GL/glew.h>
    1.13 +#include "shaders.h"
    1.14 +
    1.15 +Shader::Shader(unsigned int type)
    1.16 +{
    1.17 +	sdr = glCreateShader(type);
    1.18 +	compiled = false;
    1.19 +
    1.20 +	assert(glGetError() == GL_NO_ERROR);
    1.21 +}
    1.22 +
    1.23 +Shader::~Shader()
    1.24 +{
    1.25 +	glDeleteShader(sdr);
    1.26 +}
    1.27 +
    1.28 +void Shader::set_source(const char *src)
    1.29 +{
    1.30 +	glShaderSource(sdr, 1, &src, 0);
    1.31 +	compiled = false;
    1.32 +
    1.33 +	assert(glGetError() == GL_NO_ERROR);
    1.34 +}
    1.35 +
    1.36 +bool Shader::compile()
    1.37 +{
    1.38 +	if(compiled) {
    1.39 +		return true;
    1.40 +	}
    1.41 +
    1.42 +	glCompileShader(sdr);
    1.43 +
    1.44 +	int len;
    1.45 +	glGetShaderiv(sdr, GL_INFO_LOG_LENGTH, &len);
    1.46 +	if(len) {
    1.47 +		char *buf = (char*)alloca(len + 1);
    1.48 +		glGetShaderInfoLog(sdr, len, &len, buf);
    1.49 +		fprintf(stderr, "compiler: %s\n", buf);
    1.50 +	}
    1.51 +
    1.52 +	int status;
    1.53 +	glGetShaderiv(sdr, GL_COMPILE_STATUS, &status);
    1.54 +	if(!status) {
    1.55 +		fprintf(stderr, "shader compilation failed\n");
    1.56 +		return false;
    1.57 +	}
    1.58 +
    1.59 +	compiled = true;
    1.60 +	return true;
    1.61 +}
    1.62 +
    1.63 +bool Shader::is_compiled() const
    1.64 +{
    1.65 +	return compiled;
    1.66 +}
    1.67 +
    1.68 +bool Shader::load(const char *fname)
    1.69 +{
    1.70 +	FILE *fp;
    1.71 +
    1.72 +	if(!(fp = fopen(fname, "rb"))) {
    1.73 +		fprintf(stderr, "failed to open shader file: %s\n", fname);
    1.74 +		return false;
    1.75 +	}
    1.76 +
    1.77 +	fseek(fp, 0, SEEK_END);
    1.78 +	long sz = ftell(fp);
    1.79 +	rewind(fp);
    1.80 +
    1.81 +	char *buf = new char[sz + 1];
    1.82 +	if((long)fread(buf, 1, sz, fp) < sz) {
    1.83 +		fprintf(stderr, "failed to read shader contents\n");
    1.84 +		fclose(fp);
    1.85 +		return false;
    1.86 +	}
    1.87 +	fclose(fp);
    1.88 +
    1.89 +	set_source(buf);
    1.90 +	delete [] buf;
    1.91 +
    1.92 +	return compile();
    1.93 +}
    1.94 +
    1.95 +// ---- shader manager ----
    1.96 +static std::map<std::string, Shader*> sdrcache;
    1.97 +
    1.98 +Shader *get_shader(const char *fname, unsigned int type)
    1.99 +{
   1.100 +	std::map<std::string, Shader*>::const_iterator it;
   1.101 +
   1.102 +	if((it = sdrcache.find(std::string(fname))) != sdrcache.end()) {
   1.103 +		return it->second;
   1.104 +	}
   1.105 +
   1.106 +	Shader *sdr = new Shader(type);
   1.107 +	if(!sdr->load(fname)) {
   1.108 +		delete sdr;
   1.109 +		return 0;
   1.110 +	}
   1.111 +	sdrcache[fname] = sdr;
   1.112 +	return sdr;
   1.113 +}
   1.114 +
   1.115 +
   1.116 +// ---- class SdrProg ----
   1.117 +
   1.118 +SdrProg::SdrProg()
   1.119 +{
   1.120 +	prog = glCreateProgram();
   1.121 +	linked = false;
   1.122 +	assert(glGetError() == GL_NO_ERROR);
   1.123 +}
   1.124 +
   1.125 +SdrProg::~SdrProg()
   1.126 +{
   1.127 +	glDeleteProgram(prog);
   1.128 +}
   1.129 +
   1.130 +void SdrProg::add_shader(Shader *sdr)
   1.131 +{
   1.132 +	if(sdr->compile()) {
   1.133 +		glAttachShader(prog, sdr->sdr);
   1.134 +		assert(glGetError() == GL_NO_ERROR);
   1.135 +
   1.136 +		shaders.push_back(sdr);
   1.137 +		linked = false;
   1.138 +	}
   1.139 +}
   1.140 +
   1.141 +bool SdrProg::link()
   1.142 +{
   1.143 +	if(linked) {
   1.144 +		return true;
   1.145 +	}
   1.146 +
   1.147 +	glLinkProgram(prog);
   1.148 +
   1.149 +	int len;
   1.150 +	glGetProgramiv(prog, GL_INFO_LOG_LENGTH, &len);
   1.151 +	if(len) {
   1.152 +		char *buf = (char*)alloca(len + 1);
   1.153 +		glGetProgramInfoLog(prog, len, &len, buf);
   1.154 +		assert(glGetError() == GL_NO_ERROR);
   1.155 +		fprintf(stderr, "linker: %s\n", buf);
   1.156 +	}
   1.157 +
   1.158 +	int status;
   1.159 +	glGetProgramiv(prog, GL_LINK_STATUS, &status);
   1.160 +	if(!status) {
   1.161 +		fprintf(stderr, "program linking failed\n");
   1.162 +		return false;
   1.163 +	}
   1.164 +
   1.165 +	linked = true;
   1.166 +	return true;
   1.167 +}
   1.168 +
   1.169 +bool SdrProg::load(const char *vsfname, const char *psfname)
   1.170 +{
   1.171 +	Shader *sdr;
   1.172 +
   1.173 +	if(vsfname) {
   1.174 +		if(!(sdr = get_shader(vsfname, GL_VERTEX_SHADER))) {
   1.175 +			return false;
   1.176 +		}
   1.177 +		add_shader(sdr);
   1.178 +	}
   1.179 +
   1.180 +	if(psfname) {
   1.181 +		if(!(sdr = get_shader(psfname, GL_FRAGMENT_SHADER))) {
   1.182 +			return false;
   1.183 +		}
   1.184 +		add_shader(sdr);
   1.185 +	}
   1.186 +	return link();
   1.187 +}
   1.188 +
   1.189 +int SdrProg::get_uniform_location(const char *name)
   1.190 +{
   1.191 +	bind_program(this);
   1.192 +	return glGetUniformLocation(prog, name);
   1.193 +}
   1.194 +
   1.195 +int SdrProg::get_attribute_location(const char *name)
   1.196 +{
   1.197 +	bind_program(this);
   1.198 +	return glGetAttribLocation(prog, name);
   1.199 +}
   1.200 +
   1.201 +void SdrProg::set_uniform(const char *name, int val)
   1.202 +{
   1.203 +	set_uniform(get_uniform_location(name), val);
   1.204 +}
   1.205 +
   1.206 +void SdrProg::set_uniform(const char *name, float val)
   1.207 +{
   1.208 +	set_uniform(get_uniform_location(name), val);
   1.209 +}
   1.210 +
   1.211 +void SdrProg::set_uniform(const char *name, const Vector2 &v)
   1.212 +{
   1.213 +	set_uniform(get_uniform_location(name), v);
   1.214 +}
   1.215 +
   1.216 +void SdrProg::set_uniform(const char *name, const Vector3 &v)
   1.217 +{
   1.218 +	set_uniform(get_uniform_location(name), v);
   1.219 +}
   1.220 +
   1.221 +void SdrProg::set_uniform(const char *name, const Vector4 &v)
   1.222 +{
   1.223 +	set_uniform(get_uniform_location(name), v);
   1.224 +}
   1.225 +
   1.226 +void SdrProg::set_uniform(const char *name, const Matrix4x4 &mat)
   1.227 +{
   1.228 +	set_uniform(get_uniform_location(name), mat);
   1.229 +}
   1.230 +
   1.231 +
   1.232 +void SdrProg::set_uniform(int loc, int val)
   1.233 +{
   1.234 +	if(loc >= 0) {
   1.235 +		bind_program(this);
   1.236 +		glUniform1i(loc, val);
   1.237 +	}
   1.238 +}
   1.239 +
   1.240 +void SdrProg::set_uniform(int loc, float val)
   1.241 +{
   1.242 +	if(loc >= 0) {
   1.243 +		bind_program(this);
   1.244 +		glUniform1f(loc, val);
   1.245 +	}
   1.246 +}
   1.247 +
   1.248 +void SdrProg::set_uniform(int loc, const Vector2 &v)
   1.249 +{
   1.250 +	if(loc >= 0) {
   1.251 +		bind_program(this);
   1.252 +		glUniform2f(loc, v.x, v.y);
   1.253 +	}
   1.254 +}
   1.255 +
   1.256 +void SdrProg::set_uniform(int loc, const Vector3 &v)
   1.257 +{
   1.258 +	if(loc >= 0) {
   1.259 +		bind_program(this);
   1.260 +		glUniform3f(loc, v.x, v.y, v.z);
   1.261 +	}
   1.262 +}
   1.263 +
   1.264 +void SdrProg::set_uniform(int loc, const Vector4 &v)
   1.265 +{
   1.266 +	if(loc >= 0) {
   1.267 +		bind_program(this);
   1.268 +		glUniform4f(loc, v.x, v.y, v.z, v.w);
   1.269 +	}
   1.270 +}
   1.271 +
   1.272 +void SdrProg::set_uniform(int loc, const Matrix4x4 &mat)
   1.273 +{
   1.274 +	if(loc >= 0) {
   1.275 +		bind_program(this);
   1.276 +		// loading transpose matrix (3rd arg true)
   1.277 +#ifdef SINGLE_PRECISION_MATH
   1.278 +		glUniformMatrix4fv(loc, 1, GL_TRUE, (float*)mat.m);
   1.279 +#else
   1.280 +		glUniformMatrix4dv(loc, 1, GL_TRUE, (double*)mat.m);
   1.281 +#endif
   1.282 +	}
   1.283 +}
   1.284 +
   1.285 +bool bind_program(const SdrProg *prog)
   1.286 +{
   1.287 +	if(!prog) {
   1.288 +		glUseProgram(0);
   1.289 +		return true;
   1.290 +	}
   1.291 +
   1.292 +	if(!((SdrProg*)prog)->link()) {
   1.293 +		return false;
   1.294 +	}
   1.295 +	glUseProgram(prog->prog);
   1.296 +	if(glGetError()) {
   1.297 +		return false;
   1.298 +	}
   1.299 +	return true;
   1.300 +}