1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/sdr.c	Sat Nov 18 20:04:16 2017 +0200
     1.3 @@ -0,0 +1,562 @@
     1.4 +#include <stdio.h>
     1.5 +#include <stdlib.h>
     1.6 +#include <string.h>
     1.7 +#include <errno.h>
     1.8 +#include <stdarg.h>
     1.9 +#include <assert.h>
    1.10 +#include "opengl.h"
    1.11 +
    1.12 +#if defined(unix) || defined(__unix__)
    1.13 +#include <unistd.h>
    1.14 +#include <sys/stat.h>
    1.15 +#endif	/* unix */
    1.16 +
    1.17 +#include "sdr.h"
    1.18 +
    1.19 +static const char *sdrtypestr(unsigned int sdrtype);
    1.20 +static int sdrtypeidx(unsigned int sdrtype);
    1.21 +
    1.22 +
    1.23 +unsigned int create_vertex_shader(const char *src)
    1.24 +{
    1.25 +	return create_shader(src, GL_VERTEX_SHADER);
    1.26 +}
    1.27 +
    1.28 +unsigned int create_pixel_shader(const char *src)
    1.29 +{
    1.30 +	return create_shader(src, GL_FRAGMENT_SHADER);
    1.31 +}
    1.32 +
    1.33 +unsigned int create_tessctl_shader(const char *src)
    1.34 +{
    1.35 +#ifdef GL_TESS_CONTROL_SHADER
    1.36 +	return create_shader(src, GL_TESS_CONTROL_SHADER);
    1.37 +#else
    1.38 +	return 0;
    1.39 +#endif
    1.40 +}
    1.41 +
    1.42 +unsigned int create_tesseval_shader(const char *src)
    1.43 +{
    1.44 +#ifdef GL_TESS_EVALUATION_SHADER
    1.45 +	return create_shader(src, GL_TESS_EVALUATION_SHADER);
    1.46 +#else
    1.47 +	return 0;
    1.48 +#endif
    1.49 +}
    1.50 +
    1.51 +unsigned int create_geometry_shader(const char *src)
    1.52 +{
    1.53 +#ifdef GL_GEOMETRY_SHADER
    1.54 +	return create_shader(src, GL_GEOMETRY_SHADER);
    1.55 +#else
    1.56 +	return 0;
    1.57 +#endif
    1.58 +}
    1.59 +
    1.60 +unsigned int create_shader(const char *src, unsigned int sdr_type)
    1.61 +{
    1.62 +	unsigned int sdr;
    1.63 +	int success, info_len;
    1.64 +	char *info_str = 0;
    1.65 +	const char *src_str[3], *header, *footer;
    1.66 +	int src_str_count = 0;
    1.67 +	GLenum err;
    1.68 +
    1.69 +	if((header = get_shader_header(sdr_type))) {
    1.70 +		src_str[src_str_count++] = header;
    1.71 +	}
    1.72 +	src_str[src_str_count++] = src;
    1.73 +	if((footer = get_shader_footer(sdr_type))) {
    1.74 +		src_str[src_str_count++] = footer;
    1.75 +	}
    1.76 +
    1.77 +	sdr = glCreateShader(sdr_type);
    1.78 +	assert(glGetError() == GL_NO_ERROR);
    1.79 +	glShaderSource(sdr, src_str_count, src_str, 0);
    1.80 +	err = glGetError();
    1.81 +	assert(err == GL_NO_ERROR);
    1.82 +	glCompileShader(sdr);
    1.83 +	assert(glGetError() == GL_NO_ERROR);
    1.84 +
    1.85 +	glGetShaderiv(sdr, GL_COMPILE_STATUS, &success);
    1.86 +	assert(glGetError() == GL_NO_ERROR);
    1.87 +	glGetShaderiv(sdr, GL_INFO_LOG_LENGTH, &info_len);
    1.88 +	assert(glGetError() == GL_NO_ERROR);
    1.89 +
    1.90 +	if(info_len) {
    1.91 +		if((info_str = malloc(info_len + 1))) {
    1.92 +			glGetShaderInfoLog(sdr, info_len, 0, info_str);
    1.93 +			assert(glGetError() == GL_NO_ERROR);
    1.94 +			info_str[info_len] = 0;
    1.95 +		}
    1.96 +	}
    1.97 +
    1.98 +	if(success) {
    1.99 +		fprintf(stderr, info_str ? "done: %s\n" : "done\n", info_str);
   1.100 +	} else {
   1.101 +		fprintf(stderr, info_str ? "failed: %s\n" : "failed\n", info_str);
   1.102 +		glDeleteShader(sdr);
   1.103 +		sdr = 0;
   1.104 +	}
   1.105 +
   1.106 +	free(info_str);
   1.107 +	return sdr;
   1.108 +}
   1.109 +
   1.110 +void free_shader(unsigned int sdr)
   1.111 +{
   1.112 +	glDeleteShader(sdr);
   1.113 +}
   1.114 +
   1.115 +unsigned int load_vertex_shader(const char *fname)
   1.116 +{
   1.117 +	return load_shader(fname, GL_VERTEX_SHADER);
   1.118 +}
   1.119 +
   1.120 +unsigned int load_pixel_shader(const char *fname)
   1.121 +{
   1.122 +	return load_shader(fname, GL_FRAGMENT_SHADER);
   1.123 +}
   1.124 +
   1.125 +unsigned int load_tessctl_shader(const char *fname)
   1.126 +{
   1.127 +#ifdef GL_TESS_CONTROL_SHADER
   1.128 +	return load_shader(fname, GL_TESS_CONTROL_SHADER);
   1.129 +#else
   1.130 +	return 0;
   1.131 +#endif
   1.132 +}
   1.133 +
   1.134 +unsigned int load_tesseval_shader(const char *fname)
   1.135 +{
   1.136 +#ifdef GL_TESS_EVALUATION_SHADER
   1.137 +	return load_shader(fname, GL_TESS_EVALUATION_SHADER);
   1.138 +#else
   1.139 +	return 0;
   1.140 +#endif
   1.141 +}
   1.142 +
   1.143 +unsigned int load_geometry_shader(const char *fname)
   1.144 +{
   1.145 +#ifdef GL_GEOMETRY_SHADER
   1.146 +	return load_shader(fname, GL_GEOMETRY_SHADER);
   1.147 +#else
   1.148 +	return 0;
   1.149 +#endif
   1.150 +}
   1.151 +
   1.152 +unsigned int load_shader(const char *fname, unsigned int sdr_type)
   1.153 +{
   1.154 +	unsigned int sdr;
   1.155 +	size_t filesize;
   1.156 +	FILE *fp;
   1.157 +	char *src;
   1.158 +
   1.159 +	if(!(fp = fopen(fname, "rb"))) {
   1.160 +		fprintf(stderr, "failed to open shader %s: %s\n", fname, strerror(errno));
   1.161 +		return 0;
   1.162 +	}
   1.163 +
   1.164 +	fseek(fp, 0, SEEK_END);
   1.165 +	filesize = ftell(fp);
   1.166 +	fseek(fp, 0, SEEK_SET);
   1.167 +
   1.168 +	if(!(src = malloc(filesize + 1))) {
   1.169 +		fclose(fp);
   1.170 +		return 0;
   1.171 +	}
   1.172 +	fread(src, 1, filesize, fp);
   1.173 +	src[filesize] = 0;
   1.174 +	fclose(fp);
   1.175 +
   1.176 +	fprintf(stderr, "compiling %s shader: %s... ", sdrtypestr(sdr_type), fname);
   1.177 +	sdr = create_shader(src, sdr_type);
   1.178 +
   1.179 +	free(src);
   1.180 +	return sdr;
   1.181 +}
   1.182 +
   1.183 +
   1.184 +/* ---- gpu programs ---- */
   1.185 +
   1.186 +unsigned int create_program(void)
   1.187 +{
   1.188 +	unsigned int prog = glCreateProgram();
   1.189 +	assert(glGetError() == GL_NO_ERROR);
   1.190 +	return prog;
   1.191 +}
   1.192 +
   1.193 +unsigned int create_program_link(unsigned int sdr0, ...)
   1.194 +{
   1.195 +	unsigned int prog, sdr;
   1.196 +	va_list ap;
   1.197 +
   1.198 +	if(!(prog = create_program())) {
   1.199 +		return 0;
   1.200 +	}
   1.201 +
   1.202 +	attach_shader(prog, sdr0);
   1.203 +	if(glGetError()) {
   1.204 +		return 0;
   1.205 +	}
   1.206 +
   1.207 +	va_start(ap, sdr0);
   1.208 +	while((sdr = va_arg(ap, unsigned int))) {
   1.209 +		attach_shader(prog, sdr);
   1.210 +		if(glGetError()) {
   1.211 +			return 0;
   1.212 +		}
   1.213 +	}
   1.214 +	va_end(ap);
   1.215 +
   1.216 +	if(link_program(prog) == -1) {
   1.217 +		free_program(prog);
   1.218 +		return 0;
   1.219 +	}
   1.220 +	return prog;
   1.221 +}
   1.222 +
   1.223 +unsigned int create_program_load(const char *vfile, const char *pfile)
   1.224 +{
   1.225 +	unsigned int vs = 0, ps = 0;
   1.226 +
   1.227 +	if(vfile && *vfile && !(vs = load_vertex_shader(vfile))) {
   1.228 +		return 0;
   1.229 +	}
   1.230 +	if(pfile && *pfile && !(ps = load_pixel_shader(pfile))) {
   1.231 +		return 0;
   1.232 +	}
   1.233 +	return create_program_link(vs, ps, 0);
   1.234 +}
   1.235 +
   1.236 +void free_program(unsigned int sdr)
   1.237 +{
   1.238 +	glDeleteProgram(sdr);
   1.239 +}
   1.240 +
   1.241 +void attach_shader(unsigned int prog, unsigned int sdr)
   1.242 +{
   1.243 +	int err;
   1.244 +
   1.245 +	if(prog && sdr) {
   1.246 +		assert(glGetError() == GL_NO_ERROR);
   1.247 +		glAttachShader(prog, sdr);
   1.248 +		if((err = glGetError()) != GL_NO_ERROR) {
   1.249 +			fprintf(stderr, "failed to attach shader %u to program %u (err: 0x%x)\n", sdr, prog, err);
   1.250 +			abort();
   1.251 +		}
   1.252 +	}
   1.253 +}
   1.254 +
   1.255 +int link_program(unsigned int prog)
   1.256 +{
   1.257 +	int linked, info_len, retval = 0;
   1.258 +	char *info_str = 0;
   1.259 +
   1.260 +	glLinkProgram(prog);
   1.261 +	assert(glGetError() == GL_NO_ERROR);
   1.262 +	glGetProgramiv(prog, GL_LINK_STATUS, &linked);
   1.263 +	assert(glGetError() == GL_NO_ERROR);
   1.264 +	glGetProgramiv(prog, GL_INFO_LOG_LENGTH, &info_len);
   1.265 +	assert(glGetError() == GL_NO_ERROR);
   1.266 +
   1.267 +	if(info_len) {
   1.268 +		if((info_str = malloc(info_len + 1))) {
   1.269 +			glGetProgramInfoLog(prog, info_len, 0, info_str);
   1.270 +			assert(glGetError() == GL_NO_ERROR);
   1.271 +			info_str[info_len] = 0;
   1.272 +		}
   1.273 +	}
   1.274 +
   1.275 +	if(linked) {
   1.276 +		fprintf(stderr, info_str ? "linking done: %s\n" : "linking done\n", info_str);
   1.277 +	} else {
   1.278 +		fprintf(stderr, info_str ? "linking failed: %s\n" : "linking failed\n", info_str);
   1.279 +		retval = -1;
   1.280 +	}
   1.281 +
   1.282 +	free(info_str);
   1.283 +	return retval;
   1.284 +}
   1.285 +
   1.286 +int bind_program(unsigned int prog)
   1.287 +{
   1.288 +	GLenum err;
   1.289 +
   1.290 +	glUseProgram(prog);
   1.291 +	if(prog && (err = glGetError()) != GL_NO_ERROR) {
   1.292 +		/* maybe the program is not linked, try linking first */
   1.293 +		if(err == GL_INVALID_OPERATION) {
   1.294 +			if(link_program(prog) == -1) {
   1.295 +				return -1;
   1.296 +			}
   1.297 +			glUseProgram(prog);
   1.298 +			return glGetError() == GL_NO_ERROR ? 0 : -1;
   1.299 +		}
   1.300 +		return -1;
   1.301 +	}
   1.302 +	return 0;
   1.303 +}
   1.304 +
   1.305 +/* ugly but I'm not going to write the same bloody code over and over */
   1.306 +#define BEGIN_UNIFORM_CODE \
   1.307 +	int loc, curr_prog; \
   1.308 +	glGetIntegerv(GL_CURRENT_PROGRAM, &curr_prog); \
   1.309 +	if((unsigned int)curr_prog != prog && bind_program(prog) == -1) { \
   1.310 +		return -1; \
   1.311 +	} \
   1.312 +	if((loc = glGetUniformLocation(prog, name)) != -1)
   1.313 +
   1.314 +#define END_UNIFORM_CODE \
   1.315 +	if((unsigned int)curr_prog != prog) { \
   1.316 +		bind_program(curr_prog); \
   1.317 +	} \
   1.318 +	return loc == -1 ? -1 : 0
   1.319 +
   1.320 +int get_uniform_loc(unsigned int prog, const char *name)
   1.321 +{
   1.322 +	int loc, curr_prog;
   1.323 +	glGetIntegerv(GL_CURRENT_PROGRAM, &curr_prog);
   1.324 +	if((unsigned int)curr_prog != prog && bind_program(prog) == -1) {
   1.325 +		return -1;
   1.326 +	}
   1.327 +	loc = glGetUniformLocation(prog, name);
   1.328 +	if((unsigned int)curr_prog != prog) {
   1.329 +		bind_program(curr_prog);
   1.330 +	}
   1.331 +	return loc;
   1.332 +}
   1.333 +
   1.334 +int set_uniform_int(unsigned int prog, const char *name, int val)
   1.335 +{
   1.336 +	BEGIN_UNIFORM_CODE {
   1.337 +		glUniform1i(loc, val);
   1.338 +	}
   1.339 +	END_UNIFORM_CODE;
   1.340 +}
   1.341 +
   1.342 +int set_uniform_float(unsigned int prog, const char *name, float val)
   1.343 +{
   1.344 +	BEGIN_UNIFORM_CODE {
   1.345 +		glUniform1f(loc, val);
   1.346 +	}
   1.347 +	END_UNIFORM_CODE;
   1.348 +}
   1.349 +
   1.350 +int set_uniform_float2(unsigned int prog, const char *name, float x, float y)
   1.351 +{
   1.352 +	BEGIN_UNIFORM_CODE {
   1.353 +		glUniform2f(loc, x, y);
   1.354 +	}
   1.355 +	END_UNIFORM_CODE;
   1.356 +}
   1.357 +
   1.358 +int set_uniform_float3(unsigned int prog, const char *name, float x, float y, float z)
   1.359 +{
   1.360 +	BEGIN_UNIFORM_CODE {
   1.361 +		glUniform3f(loc, x, y, z);
   1.362 +	}
   1.363 +	END_UNIFORM_CODE;
   1.364 +}
   1.365 +
   1.366 +int set_uniform_float4(unsigned int prog, const char *name, float x, float y, float z, float w)
   1.367 +{
   1.368 +	BEGIN_UNIFORM_CODE {
   1.369 +		glUniform4f(loc, x, y, z, w);
   1.370 +	}
   1.371 +	END_UNIFORM_CODE;
   1.372 +}
   1.373 +
   1.374 +int set_uniform_matrix4(unsigned int prog, const char *name, const float *mat)
   1.375 +{
   1.376 +	BEGIN_UNIFORM_CODE {
   1.377 +		glUniformMatrix4fv(loc, 1, GL_FALSE, mat);
   1.378 +	}
   1.379 +	END_UNIFORM_CODE;
   1.380 +}
   1.381 +
   1.382 +int set_uniform_matrix4_transposed(unsigned int prog, const char *name, const float *mat)
   1.383 +{
   1.384 +	BEGIN_UNIFORM_CODE {
   1.385 +		glUniformMatrix4fv(loc, 1, GL_TRUE, mat);
   1.386 +	}
   1.387 +	END_UNIFORM_CODE;
   1.388 +}
   1.389 +
   1.390 +int get_attrib_loc(unsigned int prog, const char *name)
   1.391 +{
   1.392 +	int loc, curr_prog;
   1.393 +
   1.394 +	glGetIntegerv(GL_CURRENT_PROGRAM, &curr_prog);
   1.395 +	if((unsigned int)curr_prog != prog && bind_program(prog) == -1) {
   1.396 +		return -1;
   1.397 +	}
   1.398 +
   1.399 +	loc = glGetAttribLocation(prog, (char*)name);
   1.400 +
   1.401 +	if((unsigned int)curr_prog != prog) {
   1.402 +		bind_program(curr_prog);
   1.403 +	}
   1.404 +	return loc;
   1.405 +}
   1.406 +
   1.407 +void set_attrib_float3(int attr_loc, float x, float y, float z)
   1.408 +{
   1.409 +	glVertexAttrib3f(attr_loc, x, y, z);
   1.410 +}
   1.411 +
   1.412 +/* ---- shader composition ---- */
   1.413 +struct string {
   1.414 +	char *text;
   1.415 +	int len;
   1.416 +};
   1.417 +
   1.418 +#define NUM_SHADER_TYPES	5
   1.419 +static struct string header[NUM_SHADER_TYPES];
   1.420 +static struct string footer[NUM_SHADER_TYPES];
   1.421 +
   1.422 +static void clear_string(struct string *str)
   1.423 +{
   1.424 +	free(str->text);
   1.425 +	str->text = 0;
   1.426 +	str->len = 0;
   1.427 +}
   1.428 +
   1.429 +static void append_string(struct string *str, const char *s)
   1.430 +{
   1.431 +	int len, newlen;
   1.432 +	char *newstr;
   1.433 +
   1.434 +	if(!s || !*s) return;
   1.435 +
   1.436 +	len = strlen(s);
   1.437 +	newlen = str->len + len;
   1.438 +	if(!(newstr = malloc(newlen + 2))) {	/* leave space for a possible newline */
   1.439 +		fprintf(stderr, "shader composition: failed to append string of size %d\n", len);
   1.440 +		abort();
   1.441 +	}
   1.442 +
   1.443 +	if(str->text) {
   1.444 +		memcpy(newstr, str->text, str->len);
   1.445 +	}
   1.446 +	memcpy(newstr + str->len, s, len + 1);
   1.447 +
   1.448 +	if(s[len - 1] != '\n') {
   1.449 +		newstr[newlen] = '\n';
   1.450 +		newstr[newlen + 1] = 0;
   1.451 +	}
   1.452 +
   1.453 +	free(str->text);
   1.454 +	str->text = newstr;
   1.455 +	str->len = newlen;
   1.456 +}
   1.457 +
   1.458 +void clear_shader_header(unsigned int type)
   1.459 +{
   1.460 +	if(type) {
   1.461 +		int idx = sdrtypeidx(type);
   1.462 +		clear_string(&header[idx]);
   1.463 +	} else {
   1.464 +		int i;
   1.465 +		for(i=0; i<NUM_SHADER_TYPES; i++) {
   1.466 +			clear_string(&header[i]);
   1.467 +		}
   1.468 +	}
   1.469 +}
   1.470 +
   1.471 +void clear_shader_footer(unsigned int type)
   1.472 +{
   1.473 +	if(type) {
   1.474 +		int idx = sdrtypeidx(type);
   1.475 +		clear_string(&footer[idx]);
   1.476 +	} else {
   1.477 +		int i;
   1.478 +		for(i=0; i<NUM_SHADER_TYPES; i++) {
   1.479 +			clear_string(&footer[i]);
   1.480 +		}
   1.481 +	}
   1.482 +}
   1.483 +
   1.484 +void add_shader_header(unsigned int type, const char *s)
   1.485 +{
   1.486 +	if(type) {
   1.487 +		int idx = sdrtypeidx(type);
   1.488 +		append_string(&header[idx], s);
   1.489 +	} else {
   1.490 +		int i;
   1.491 +		for(i=0; i<NUM_SHADER_TYPES; i++) {
   1.492 +			append_string(&header[i], s);
   1.493 +		}
   1.494 +	}
   1.495 +}
   1.496 +
   1.497 +void add_shader_footer(unsigned int type, const char *s)
   1.498 +{
   1.499 +	if(type) {
   1.500 +		int idx = sdrtypeidx(type);
   1.501 +		append_string(&footer[idx], s);
   1.502 +	} else {
   1.503 +		int i;
   1.504 +		for(i=0; i<NUM_SHADER_TYPES; i++) {
   1.505 +			append_string(&footer[i], s);
   1.506 +		}
   1.507 +	}
   1.508 +}
   1.509 +
   1.510 +const char *get_shader_header(unsigned int type)
   1.511 +{
   1.512 +	int idx = sdrtypeidx(type);
   1.513 +	return header[idx].text;
   1.514 +}
   1.515 +
   1.516 +const char *get_shader_footer(unsigned int type)
   1.517 +{
   1.518 +	int idx = sdrtypeidx(type);
   1.519 +	return footer[idx].text;
   1.520 +}
   1.521 +
   1.522 +static const char *sdrtypestr(unsigned int sdrtype)
   1.523 +{
   1.524 +	switch(sdrtype) {
   1.525 +	case GL_VERTEX_SHADER:
   1.526 +		return "vertex";
   1.527 +	case GL_FRAGMENT_SHADER:
   1.528 +		return "pixel";
   1.529 +#ifdef GL_TESS_CONTROL_SHADER
   1.530 +	case GL_TESS_CONTROL_SHADER:
   1.531 +		return "tessellation control";
   1.532 +#endif
   1.533 +#ifdef GL_TESS_EVALUATION_SHADER
   1.534 +	case GL_TESS_EVALUATION_SHADER:
   1.535 +		return "tessellation evaluation";
   1.536 +#endif
   1.537 +#ifdef GL_GEOMETRY_SHADER
   1.538 +	case GL_GEOMETRY_SHADER:
   1.539 +		return "geometry";
   1.540 +#endif
   1.541 +
   1.542 +	default:
   1.543 +		break;
   1.544 +	}
   1.545 +	return "<unknown>";
   1.546 +}
   1.547 +
   1.548 +static int sdrtypeidx(unsigned int sdrtype)
   1.549 +{
   1.550 +	switch(sdrtype) {
   1.551 +	case GL_VERTEX_SHADER:
   1.552 +		return 0;
   1.553 +	case GL_FRAGMENT_SHADER:
   1.554 +		return 1;
   1.555 +	case GL_TESS_CONTROL_SHADER:
   1.556 +		return 2;
   1.557 +	case GL_TESS_EVALUATION_SHADER:
   1.558 +		return 3;
   1.559 +	case GL_GEOMETRY_SHADER:
   1.560 +		return 4;
   1.561 +	default:
   1.562 +		break;
   1.563 +	}
   1.564 +	return 0;
   1.565 +}