1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/.hgignore	Sat Nov 18 20:04:16 2017 +0200
     1.3 @@ -0,0 +1,4 @@
     1.4 +\.o$
     1.5 +\.d$
     1.6 +\.swp$
     1.7 +^fractorb$

     2.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     2.2 +++ b/Makefile	Sat Nov 18 20:04:16 2017 +0200
     2.3 @@ -0,0 +1,13 @@
     2.4 +src = $(wildcard src/*.c)
     2.5 +obj = $(src:.c=.o)
     2.6 +bin = fractorb
     2.7 +
     2.8 +CFLAGS = -pedantic -Wall -g
     2.9 +LDFLAGS = -lGL -lglut -lGLEW -lm
    2.10 +
    2.11 +$(bin): $(obj)
    2.12 +	$(CC) -o $@ $(obj) $(LDFLAGS)
    2.13 +
    2.14 +.PHONY: clean
    2.15 +clean:
    2.16 +	rm -f $(obj) $(bin)

     3.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     3.2 +++ b/mbrot.glsl	Sat Nov 18 20:04:16 2017 +0200
     3.3 @@ -0,0 +1,30 @@
     3.4 +// vi:ft=glsl:
     3.5 +#define ITER	96
     3.6 +
     3.7 +uniform float view_scale;
     3.8 +uniform vec2 view_center;
     3.9 +
    3.10 +float mbrot_dist_point(in vec2 c, in vec2 p)
    3.11 +{
    3.12 +	vec2 z = c;
    3.13 +	float mindist_sq = 8192.0;
    3.14 +
    3.15 +	for(int i=0; i<ITER; i++) {
    3.16 +		float x = (z.x * z.x - z.y * z.y) + c.x;
    3.17 +		float y = (z.x * z.y + z.x * z.y) + c.y;
    3.18 +
    3.19 +		z = vec2(x, y);
    3.20 +		mindist_sq = min(mindist_sq, dot(z, z)); 
    3.21 +	}
    3.22 +
    3.23 +	return sqrt(mindist_sq);
    3.24 +}
    3.25 +
    3.26 +void main()
    3.27 +{
    3.28 +	vec2 c = gl_TexCoord[0].xy * view_scale - view_center;
    3.29 +	float m = 1.0 - mbrot_dist_point(c, vec2(0.0, 0.0));
    3.30 +
    3.31 +	gl_FragColor.rgb = vec3(m, m, m);
    3.32 +	gl_FragColor.a = 1.0;
    3.33 +}

     4.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     4.2 +++ b/src/main.c	Sat Nov 18 20:04:16 2017 +0200
     4.3 @@ -0,0 +1,95 @@
     4.4 +#include <stdio.h>
     4.5 +#include <stdlib.h>
     4.6 +#include <GL/glew.h>
     4.7 +#include <GL/glut.h>
     4.8 +#include "sdr.h"
     4.9 +
    4.10 +int init(void);
    4.11 +void cleanup(void);
    4.12 +void disp(void);
    4.13 +void reshape(int x, int y);
    4.14 +void keyb(unsigned char key, int x, int y);
    4.15 +void mouse(int bn, int st, int x, int y);
    4.16 +void motion(int x, int y);
    4.17 +
    4.18 +static float aspect;
    4.19 +static int mouse_x, mouse_y;
    4.20 +static unsigned int prog_mbrot;
    4.21 +
    4.22 +int main(int argc, char **argv)
    4.23 +{
    4.24 +	glutInit(&argc, argv);
    4.25 +	glutInitWindowSize(1280, 800);
    4.26 +	glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
    4.27 +	glutCreateWindow("fractorb");
    4.28 +
    4.29 +	glutDisplayFunc(disp);
    4.30 +	glutReshapeFunc(reshape);
    4.31 +	glutKeyboardFunc(keyb);
    4.32 +	glutMouseFunc(mouse);
    4.33 +	glutMotionFunc(motion);
    4.34 +
    4.35 +	if(init() == -1) {
    4.36 +		return 1;
    4.37 +	}
    4.38 +	atexit(cleanup);
    4.39 +
    4.40 +	glutMainLoop();
    4.41 +	return 0;
    4.42 +}
    4.43 +
    4.44 +
    4.45 +int init(void)
    4.46 +{
    4.47 +	glewInit();
    4.48 +
    4.49 +	if(!(prog_mbrot = create_program_load("vertex.glsl", "mbrot.glsl"))) {
    4.50 +		return -1;
    4.51 +	}
    4.52 +	set_uniform_float(prog_mbrot, "view_scale", 1.1);
    4.53 +	set_uniform_float2(prog_mbrot, "view_center", 0.7, 0);
    4.54 +	return 0;
    4.55 +}
    4.56 +
    4.57 +void cleanup(void)
    4.58 +{
    4.59 +	free_program(prog_mbrot);
    4.60 +}
    4.61 +
    4.62 +void disp(void)
    4.63 +{
    4.64 +	glUseProgram(prog_mbrot);
    4.65 +
    4.66 +	glBegin(GL_QUADS);
    4.67 +	glTexCoord2f(-aspect, 1); glVertex2f(-1, -1);
    4.68 +	glTexCoord2f(aspect, 1); glVertex2f(1, -1);
    4.69 +	glTexCoord2f(aspect, -1); glVertex2f(1, 1);
    4.70 +	glTexCoord2f(-aspect, -1); glVertex2f(-1, 1);
    4.71 +	glEnd();
    4.72 +
    4.73 +	glutSwapBuffers();
    4.74 +}
    4.75 +
    4.76 +void reshape(int x, int y)
    4.77 +{
    4.78 +	glViewport(0, 0, x, y);
    4.79 +
    4.80 +	aspect = (float)x / (float)y;
    4.81 +}
    4.82 +
    4.83 +void keyb(unsigned char key, int x, int y)
    4.84 +{
    4.85 +	if(key == 27) {
    4.86 +		exit(0);
    4.87 +	}
    4.88 +}
    4.89 +
    4.90 +void mouse(int bn, int st, int x, int y)
    4.91 +{
    4.92 +}
    4.93 +
    4.94 +void motion(int x, int y)
    4.95 +{
    4.96 +	mouse_x = x;
    4.97 +	mouse_y = y;
    4.98 +}

     5.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     5.2 +++ b/src/opengl.h	Sat Nov 18 20:04:16 2017 +0200
     5.3 @@ -0,0 +1,33 @@
     5.4 +#ifndef OPENGL_H_
     5.5 +#define OPENGL_H_
     5.6 +
     5.7 +#ifdef HAVE_CONFIG_H_
     5.8 +#include "config.h"
     5.9 +#endif
    5.10 +
    5.11 +#if defined(IPHONE) || defined(__IPHONE__)
    5.12 +#include <OpenGLES/ES2/gl.h>
    5.13 +
    5.14 +#define glClearDepth	glClearDepthf
    5.15 +#define GLDEF
    5.16 +#include "sanegl.h"
    5.17 +
    5.18 +#elif defined(ANDROID)
    5.19 +#include <GLES2/gl2.h>
    5.20 +#include <GLES2/gl2ext.h>
    5.21 +#define GLDEF
    5.22 +#include "sanegl.h"
    5.23 +
    5.24 +#else
    5.25 +
    5.26 +#include <GL/glew.h>
    5.27 +
    5.28 +#ifdef __APPLE__
    5.29 +#include <GLUT/glut.h>
    5.30 +#else
    5.31 +#include <GL/glut.h>
    5.32 +#endif	/* __APPLE__ */
    5.33 +
    5.34 +#endif	/* IPHONE */
    5.35 +
    5.36 +#endif	/* OPENGL_H_ */

     6.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     6.2 +++ b/src/sdr.c	Sat Nov 18 20:04:16 2017 +0200
     6.3 @@ -0,0 +1,562 @@
     6.4 +#include <stdio.h>
     6.5 +#include <stdlib.h>
     6.6 +#include <string.h>
     6.7 +#include <errno.h>
     6.8 +#include <stdarg.h>
     6.9 +#include <assert.h>
    6.10 +#include "opengl.h"
    6.11 +
    6.12 +#if defined(unix) || defined(__unix__)
    6.13 +#include <unistd.h>
    6.14 +#include <sys/stat.h>
    6.15 +#endif	/* unix */
    6.16 +
    6.17 +#include "sdr.h"
    6.18 +
    6.19 +static const char *sdrtypestr(unsigned int sdrtype);
    6.20 +static int sdrtypeidx(unsigned int sdrtype);
    6.21 +
    6.22 +
    6.23 +unsigned int create_vertex_shader(const char *src)
    6.24 +{
    6.25 +	return create_shader(src, GL_VERTEX_SHADER);
    6.26 +}
    6.27 +
    6.28 +unsigned int create_pixel_shader(const char *src)
    6.29 +{
    6.30 +	return create_shader(src, GL_FRAGMENT_SHADER);
    6.31 +}
    6.32 +
    6.33 +unsigned int create_tessctl_shader(const char *src)
    6.34 +{
    6.35 +#ifdef GL_TESS_CONTROL_SHADER
    6.36 +	return create_shader(src, GL_TESS_CONTROL_SHADER);
    6.37 +#else
    6.38 +	return 0;
    6.39 +#endif
    6.40 +}
    6.41 +
    6.42 +unsigned int create_tesseval_shader(const char *src)
    6.43 +{
    6.44 +#ifdef GL_TESS_EVALUATION_SHADER
    6.45 +	return create_shader(src, GL_TESS_EVALUATION_SHADER);
    6.46 +#else
    6.47 +	return 0;
    6.48 +#endif
    6.49 +}
    6.50 +
    6.51 +unsigned int create_geometry_shader(const char *src)
    6.52 +{
    6.53 +#ifdef GL_GEOMETRY_SHADER
    6.54 +	return create_shader(src, GL_GEOMETRY_SHADER);
    6.55 +#else
    6.56 +	return 0;
    6.57 +#endif
    6.58 +}
    6.59 +
    6.60 +unsigned int create_shader(const char *src, unsigned int sdr_type)
    6.61 +{
    6.62 +	unsigned int sdr;
    6.63 +	int success, info_len;
    6.64 +	char *info_str = 0;
    6.65 +	const char *src_str[3], *header, *footer;
    6.66 +	int src_str_count = 0;
    6.67 +	GLenum err;
    6.68 +
    6.69 +	if((header = get_shader_header(sdr_type))) {
    6.70 +		src_str[src_str_count++] = header;
    6.71 +	}
    6.72 +	src_str[src_str_count++] = src;
    6.73 +	if((footer = get_shader_footer(sdr_type))) {
    6.74 +		src_str[src_str_count++] = footer;
    6.75 +	}
    6.76 +
    6.77 +	sdr = glCreateShader(sdr_type);
    6.78 +	assert(glGetError() == GL_NO_ERROR);
    6.79 +	glShaderSource(sdr, src_str_count, src_str, 0);
    6.80 +	err = glGetError();
    6.81 +	assert(err == GL_NO_ERROR);
    6.82 +	glCompileShader(sdr);
    6.83 +	assert(glGetError() == GL_NO_ERROR);
    6.84 +
    6.85 +	glGetShaderiv(sdr, GL_COMPILE_STATUS, &success);
    6.86 +	assert(glGetError() == GL_NO_ERROR);
    6.87 +	glGetShaderiv(sdr, GL_INFO_LOG_LENGTH, &info_len);
    6.88 +	assert(glGetError() == GL_NO_ERROR);
    6.89 +
    6.90 +	if(info_len) {
    6.91 +		if((info_str = malloc(info_len + 1))) {
    6.92 +			glGetShaderInfoLog(sdr, info_len, 0, info_str);
    6.93 +			assert(glGetError() == GL_NO_ERROR);
    6.94 +			info_str[info_len] = 0;
    6.95 +		}
    6.96 +	}
    6.97 +
    6.98 +	if(success) {
    6.99 +		fprintf(stderr, info_str ? "done: %s\n" : "done\n", info_str);
   6.100 +	} else {
   6.101 +		fprintf(stderr, info_str ? "failed: %s\n" : "failed\n", info_str);
   6.102 +		glDeleteShader(sdr);
   6.103 +		sdr = 0;
   6.104 +	}
   6.105 +
   6.106 +	free(info_str);
   6.107 +	return sdr;
   6.108 +}
   6.109 +
   6.110 +void free_shader(unsigned int sdr)
   6.111 +{
   6.112 +	glDeleteShader(sdr);
   6.113 +}
   6.114 +
   6.115 +unsigned int load_vertex_shader(const char *fname)
   6.116 +{
   6.117 +	return load_shader(fname, GL_VERTEX_SHADER);
   6.118 +}
   6.119 +
   6.120 +unsigned int load_pixel_shader(const char *fname)
   6.121 +{
   6.122 +	return load_shader(fname, GL_FRAGMENT_SHADER);
   6.123 +}
   6.124 +
   6.125 +unsigned int load_tessctl_shader(const char *fname)
   6.126 +{
   6.127 +#ifdef GL_TESS_CONTROL_SHADER
   6.128 +	return load_shader(fname, GL_TESS_CONTROL_SHADER);
   6.129 +#else
   6.130 +	return 0;
   6.131 +#endif
   6.132 +}
   6.133 +
   6.134 +unsigned int load_tesseval_shader(const char *fname)
   6.135 +{
   6.136 +#ifdef GL_TESS_EVALUATION_SHADER
   6.137 +	return load_shader(fname, GL_TESS_EVALUATION_SHADER);
   6.138 +#else
   6.139 +	return 0;
   6.140 +#endif
   6.141 +}
   6.142 +
   6.143 +unsigned int load_geometry_shader(const char *fname)
   6.144 +{
   6.145 +#ifdef GL_GEOMETRY_SHADER
   6.146 +	return load_shader(fname, GL_GEOMETRY_SHADER);
   6.147 +#else
   6.148 +	return 0;
   6.149 +#endif
   6.150 +}
   6.151 +
   6.152 +unsigned int load_shader(const char *fname, unsigned int sdr_type)
   6.153 +{
   6.154 +	unsigned int sdr;
   6.155 +	size_t filesize;
   6.156 +	FILE *fp;
   6.157 +	char *src;
   6.158 +
   6.159 +	if(!(fp = fopen(fname, "rb"))) {
   6.160 +		fprintf(stderr, "failed to open shader %s: %s\n", fname, strerror(errno));
   6.161 +		return 0;
   6.162 +	}
   6.163 +
   6.164 +	fseek(fp, 0, SEEK_END);
   6.165 +	filesize = ftell(fp);
   6.166 +	fseek(fp, 0, SEEK_SET);
   6.167 +
   6.168 +	if(!(src = malloc(filesize + 1))) {
   6.169 +		fclose(fp);
   6.170 +		return 0;
   6.171 +	}
   6.172 +	fread(src, 1, filesize, fp);
   6.173 +	src[filesize] = 0;
   6.174 +	fclose(fp);
   6.175 +
   6.176 +	fprintf(stderr, "compiling %s shader: %s... ", sdrtypestr(sdr_type), fname);
   6.177 +	sdr = create_shader(src, sdr_type);
   6.178 +
   6.179 +	free(src);
   6.180 +	return sdr;
   6.181 +}
   6.182 +
   6.183 +
   6.184 +/* ---- gpu programs ---- */
   6.185 +
   6.186 +unsigned int create_program(void)
   6.187 +{
   6.188 +	unsigned int prog = glCreateProgram();
   6.189 +	assert(glGetError() == GL_NO_ERROR);
   6.190 +	return prog;
   6.191 +}
   6.192 +
   6.193 +unsigned int create_program_link(unsigned int sdr0, ...)
   6.194 +{
   6.195 +	unsigned int prog, sdr;
   6.196 +	va_list ap;
   6.197 +
   6.198 +	if(!(prog = create_program())) {
   6.199 +		return 0;
   6.200 +	}
   6.201 +
   6.202 +	attach_shader(prog, sdr0);
   6.203 +	if(glGetError()) {
   6.204 +		return 0;
   6.205 +	}
   6.206 +
   6.207 +	va_start(ap, sdr0);
   6.208 +	while((sdr = va_arg(ap, unsigned int))) {
   6.209 +		attach_shader(prog, sdr);
   6.210 +		if(glGetError()) {
   6.211 +			return 0;
   6.212 +		}
   6.213 +	}
   6.214 +	va_end(ap);
   6.215 +
   6.216 +	if(link_program(prog) == -1) {
   6.217 +		free_program(prog);
   6.218 +		return 0;
   6.219 +	}
   6.220 +	return prog;
   6.221 +}
   6.222 +
   6.223 +unsigned int create_program_load(const char *vfile, const char *pfile)
   6.224 +{
   6.225 +	unsigned int vs = 0, ps = 0;
   6.226 +
   6.227 +	if(vfile && *vfile && !(vs = load_vertex_shader(vfile))) {
   6.228 +		return 0;
   6.229 +	}
   6.230 +	if(pfile && *pfile && !(ps = load_pixel_shader(pfile))) {
   6.231 +		return 0;
   6.232 +	}
   6.233 +	return create_program_link(vs, ps, 0);
   6.234 +}
   6.235 +
   6.236 +void free_program(unsigned int sdr)
   6.237 +{
   6.238 +	glDeleteProgram(sdr);
   6.239 +}
   6.240 +
   6.241 +void attach_shader(unsigned int prog, unsigned int sdr)
   6.242 +{
   6.243 +	int err;
   6.244 +
   6.245 +	if(prog && sdr) {
   6.246 +		assert(glGetError() == GL_NO_ERROR);
   6.247 +		glAttachShader(prog, sdr);
   6.248 +		if((err = glGetError()) != GL_NO_ERROR) {
   6.249 +			fprintf(stderr, "failed to attach shader %u to program %u (err: 0x%x)\n", sdr, prog, err);
   6.250 +			abort();
   6.251 +		}
   6.252 +	}
   6.253 +}
   6.254 +
   6.255 +int link_program(unsigned int prog)
   6.256 +{
   6.257 +	int linked, info_len, retval = 0;
   6.258 +	char *info_str = 0;
   6.259 +
   6.260 +	glLinkProgram(prog);
   6.261 +	assert(glGetError() == GL_NO_ERROR);
   6.262 +	glGetProgramiv(prog, GL_LINK_STATUS, &linked);
   6.263 +	assert(glGetError() == GL_NO_ERROR);
   6.264 +	glGetProgramiv(prog, GL_INFO_LOG_LENGTH, &info_len);
   6.265 +	assert(glGetError() == GL_NO_ERROR);
   6.266 +
   6.267 +	if(info_len) {
   6.268 +		if((info_str = malloc(info_len + 1))) {
   6.269 +			glGetProgramInfoLog(prog, info_len, 0, info_str);
   6.270 +			assert(glGetError() == GL_NO_ERROR);
   6.271 +			info_str[info_len] = 0;
   6.272 +		}
   6.273 +	}
   6.274 +
   6.275 +	if(linked) {
   6.276 +		fprintf(stderr, info_str ? "linking done: %s\n" : "linking done\n", info_str);
   6.277 +	} else {
   6.278 +		fprintf(stderr, info_str ? "linking failed: %s\n" : "linking failed\n", info_str);
   6.279 +		retval = -1;
   6.280 +	}
   6.281 +
   6.282 +	free(info_str);
   6.283 +	return retval;
   6.284 +}
   6.285 +
   6.286 +int bind_program(unsigned int prog)
   6.287 +{
   6.288 +	GLenum err;
   6.289 +
   6.290 +	glUseProgram(prog);
   6.291 +	if(prog && (err = glGetError()) != GL_NO_ERROR) {
   6.292 +		/* maybe the program is not linked, try linking first */
   6.293 +		if(err == GL_INVALID_OPERATION) {
   6.294 +			if(link_program(prog) == -1) {
   6.295 +				return -1;
   6.296 +			}
   6.297 +			glUseProgram(prog);
   6.298 +			return glGetError() == GL_NO_ERROR ? 0 : -1;
   6.299 +		}
   6.300 +		return -1;
   6.301 +	}
   6.302 +	return 0;
   6.303 +}
   6.304 +
   6.305 +/* ugly but I'm not going to write the same bloody code over and over */
   6.306 +#define BEGIN_UNIFORM_CODE \
   6.307 +	int loc, curr_prog; \
   6.308 +	glGetIntegerv(GL_CURRENT_PROGRAM, &curr_prog); \
   6.309 +	if((unsigned int)curr_prog != prog && bind_program(prog) == -1) { \
   6.310 +		return -1; \
   6.311 +	} \
   6.312 +	if((loc = glGetUniformLocation(prog, name)) != -1)
   6.313 +
   6.314 +#define END_UNIFORM_CODE \
   6.315 +	if((unsigned int)curr_prog != prog) { \
   6.316 +		bind_program(curr_prog); \
   6.317 +	} \
   6.318 +	return loc == -1 ? -1 : 0
   6.319 +
   6.320 +int get_uniform_loc(unsigned int prog, const char *name)
   6.321 +{
   6.322 +	int loc, curr_prog;
   6.323 +	glGetIntegerv(GL_CURRENT_PROGRAM, &curr_prog);
   6.324 +	if((unsigned int)curr_prog != prog && bind_program(prog) == -1) {
   6.325 +		return -1;
   6.326 +	}
   6.327 +	loc = glGetUniformLocation(prog, name);
   6.328 +	if((unsigned int)curr_prog != prog) {
   6.329 +		bind_program(curr_prog);
   6.330 +	}
   6.331 +	return loc;
   6.332 +}
   6.333 +
   6.334 +int set_uniform_int(unsigned int prog, const char *name, int val)
   6.335 +{
   6.336 +	BEGIN_UNIFORM_CODE {
   6.337 +		glUniform1i(loc, val);
   6.338 +	}
   6.339 +	END_UNIFORM_CODE;
   6.340 +}
   6.341 +
   6.342 +int set_uniform_float(unsigned int prog, const char *name, float val)
   6.343 +{
   6.344 +	BEGIN_UNIFORM_CODE {
   6.345 +		glUniform1f(loc, val);
   6.346 +	}
   6.347 +	END_UNIFORM_CODE;
   6.348 +}
   6.349 +
   6.350 +int set_uniform_float2(unsigned int prog, const char *name, float x, float y)
   6.351 +{
   6.352 +	BEGIN_UNIFORM_CODE {
   6.353 +		glUniform2f(loc, x, y);
   6.354 +	}
   6.355 +	END_UNIFORM_CODE;
   6.356 +}
   6.357 +
   6.358 +int set_uniform_float3(unsigned int prog, const char *name, float x, float y, float z)
   6.359 +{
   6.360 +	BEGIN_UNIFORM_CODE {
   6.361 +		glUniform3f(loc, x, y, z);
   6.362 +	}
   6.363 +	END_UNIFORM_CODE;
   6.364 +}
   6.365 +
   6.366 +int set_uniform_float4(unsigned int prog, const char *name, float x, float y, float z, float w)
   6.367 +{
   6.368 +	BEGIN_UNIFORM_CODE {
   6.369 +		glUniform4f(loc, x, y, z, w);
   6.370 +	}
   6.371 +	END_UNIFORM_CODE;
   6.372 +}
   6.373 +
   6.374 +int set_uniform_matrix4(unsigned int prog, const char *name, const float *mat)
   6.375 +{
   6.376 +	BEGIN_UNIFORM_CODE {
   6.377 +		glUniformMatrix4fv(loc, 1, GL_FALSE, mat);
   6.378 +	}
   6.379 +	END_UNIFORM_CODE;
   6.380 +}
   6.381 +
   6.382 +int set_uniform_matrix4_transposed(unsigned int prog, const char *name, const float *mat)
   6.383 +{
   6.384 +	BEGIN_UNIFORM_CODE {
   6.385 +		glUniformMatrix4fv(loc, 1, GL_TRUE, mat);
   6.386 +	}
   6.387 +	END_UNIFORM_CODE;
   6.388 +}
   6.389 +
   6.390 +int get_attrib_loc(unsigned int prog, const char *name)
   6.391 +{
   6.392 +	int loc, curr_prog;
   6.393 +
   6.394 +	glGetIntegerv(GL_CURRENT_PROGRAM, &curr_prog);
   6.395 +	if((unsigned int)curr_prog != prog && bind_program(prog) == -1) {
   6.396 +		return -1;
   6.397 +	}
   6.398 +
   6.399 +	loc = glGetAttribLocation(prog, (char*)name);
   6.400 +
   6.401 +	if((unsigned int)curr_prog != prog) {
   6.402 +		bind_program(curr_prog);
   6.403 +	}
   6.404 +	return loc;
   6.405 +}
   6.406 +
   6.407 +void set_attrib_float3(int attr_loc, float x, float y, float z)
   6.408 +{
   6.409 +	glVertexAttrib3f(attr_loc, x, y, z);
   6.410 +}
   6.411 +
   6.412 +/* ---- shader composition ---- */
   6.413 +struct string {
   6.414 +	char *text;
   6.415 +	int len;
   6.416 +};
   6.417 +
   6.418 +#define NUM_SHADER_TYPES	5
   6.419 +static struct string header[NUM_SHADER_TYPES];
   6.420 +static struct string footer[NUM_SHADER_TYPES];
   6.421 +
   6.422 +static void clear_string(struct string *str)
   6.423 +{
   6.424 +	free(str->text);
   6.425 +	str->text = 0;
   6.426 +	str->len = 0;
   6.427 +}
   6.428 +
   6.429 +static void append_string(struct string *str, const char *s)
   6.430 +{
   6.431 +	int len, newlen;
   6.432 +	char *newstr;
   6.433 +
   6.434 +	if(!s || !*s) return;
   6.435 +
   6.436 +	len = strlen(s);
   6.437 +	newlen = str->len + len;
   6.438 +	if(!(newstr = malloc(newlen + 2))) {	/* leave space for a possible newline */
   6.439 +		fprintf(stderr, "shader composition: failed to append string of size %d\n", len);
   6.440 +		abort();
   6.441 +	}
   6.442 +
   6.443 +	if(str->text) {
   6.444 +		memcpy(newstr, str->text, str->len);
   6.445 +	}
   6.446 +	memcpy(newstr + str->len, s, len + 1);
   6.447 +
   6.448 +	if(s[len - 1] != '\n') {
   6.449 +		newstr[newlen] = '\n';
   6.450 +		newstr[newlen + 1] = 0;
   6.451 +	}
   6.452 +
   6.453 +	free(str->text);
   6.454 +	str->text = newstr;
   6.455 +	str->len = newlen;
   6.456 +}
   6.457 +
   6.458 +void clear_shader_header(unsigned int type)
   6.459 +{
   6.460 +	if(type) {
   6.461 +		int idx = sdrtypeidx(type);
   6.462 +		clear_string(&header[idx]);
   6.463 +	} else {
   6.464 +		int i;
   6.465 +		for(i=0; i<NUM_SHADER_TYPES; i++) {
   6.466 +			clear_string(&header[i]);
   6.467 +		}
   6.468 +	}
   6.469 +}
   6.470 +
   6.471 +void clear_shader_footer(unsigned int type)
   6.472 +{
   6.473 +	if(type) {
   6.474 +		int idx = sdrtypeidx(type);
   6.475 +		clear_string(&footer[idx]);
   6.476 +	} else {
   6.477 +		int i;
   6.478 +		for(i=0; i<NUM_SHADER_TYPES; i++) {
   6.479 +			clear_string(&footer[i]);
   6.480 +		}
   6.481 +	}
   6.482 +}
   6.483 +
   6.484 +void add_shader_header(unsigned int type, const char *s)
   6.485 +{
   6.486 +	if(type) {
   6.487 +		int idx = sdrtypeidx(type);
   6.488 +		append_string(&header[idx], s);
   6.489 +	} else {
   6.490 +		int i;
   6.491 +		for(i=0; i<NUM_SHADER_TYPES; i++) {
   6.492 +			append_string(&header[i], s);
   6.493 +		}
   6.494 +	}
   6.495 +}
   6.496 +
   6.497 +void add_shader_footer(unsigned int type, const char *s)
   6.498 +{
   6.499 +	if(type) {
   6.500 +		int idx = sdrtypeidx(type);
   6.501 +		append_string(&footer[idx], s);
   6.502 +	} else {
   6.503 +		int i;
   6.504 +		for(i=0; i<NUM_SHADER_TYPES; i++) {
   6.505 +			append_string(&footer[i], s);
   6.506 +		}
   6.507 +	}
   6.508 +}
   6.509 +
   6.510 +const char *get_shader_header(unsigned int type)
   6.511 +{
   6.512 +	int idx = sdrtypeidx(type);
   6.513 +	return header[idx].text;
   6.514 +}
   6.515 +
   6.516 +const char *get_shader_footer(unsigned int type)
   6.517 +{
   6.518 +	int idx = sdrtypeidx(type);
   6.519 +	return footer[idx].text;
   6.520 +}
   6.521 +
   6.522 +static const char *sdrtypestr(unsigned int sdrtype)
   6.523 +{
   6.524 +	switch(sdrtype) {
   6.525 +	case GL_VERTEX_SHADER:
   6.526 +		return "vertex";
   6.527 +	case GL_FRAGMENT_SHADER:
   6.528 +		return "pixel";
   6.529 +#ifdef GL_TESS_CONTROL_SHADER
   6.530 +	case GL_TESS_CONTROL_SHADER:
   6.531 +		return "tessellation control";
   6.532 +#endif
   6.533 +#ifdef GL_TESS_EVALUATION_SHADER
   6.534 +	case GL_TESS_EVALUATION_SHADER:
   6.535 +		return "tessellation evaluation";
   6.536 +#endif
   6.537 +#ifdef GL_GEOMETRY_SHADER
   6.538 +	case GL_GEOMETRY_SHADER:
   6.539 +		return "geometry";
   6.540 +#endif
   6.541 +
   6.542 +	default:
   6.543 +		break;
   6.544 +	}
   6.545 +	return "<unknown>";
   6.546 +}
   6.547 +
   6.548 +static int sdrtypeidx(unsigned int sdrtype)
   6.549 +{
   6.550 +	switch(sdrtype) {
   6.551 +	case GL_VERTEX_SHADER:
   6.552 +		return 0;
   6.553 +	case GL_FRAGMENT_SHADER:
   6.554 +		return 1;
   6.555 +	case GL_TESS_CONTROL_SHADER:
   6.556 +		return 2;
   6.557 +	case GL_TESS_EVALUATION_SHADER:
   6.558 +		return 3;
   6.559 +	case GL_GEOMETRY_SHADER:
   6.560 +		return 4;
   6.561 +	default:
   6.562 +		break;
   6.563 +	}
   6.564 +	return 0;
   6.565 +}

     7.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     7.2 +++ b/src/sdr.h	Sat Nov 18 20:04:16 2017 +0200
     7.3 @@ -0,0 +1,68 @@
     7.4 +#ifndef SDR_H_
     7.5 +#define SDR_H_
     7.6 +
     7.7 +#ifdef __cplusplus
     7.8 +extern "C" {
     7.9 +#endif	/* __cplusplus */
    7.10 +
    7.11 +/* ---- shaders ---- */
    7.12 +unsigned int create_vertex_shader(const char *src);
    7.13 +unsigned int create_pixel_shader(const char *src);
    7.14 +unsigned int create_tessctl_shader(const char *src);
    7.15 +unsigned int create_tesseval_shader(const char *src);
    7.16 +unsigned int create_geometry_shader(const char *src);
    7.17 +unsigned int create_shader(const char *src, unsigned int sdr_type);
    7.18 +void free_shader(unsigned int sdr);
    7.19 +
    7.20 +unsigned int load_vertex_shader(const char *fname);
    7.21 +unsigned int load_pixel_shader(const char *fname);
    7.22 +unsigned int load_tessctl_shader(const char *fname);
    7.23 +unsigned int load_tesseval_shader(const char *fname);
    7.24 +unsigned int load_geometry_shader(const char *fname);
    7.25 +unsigned int load_shader(const char *src, unsigned int sdr_type);
    7.26 +
    7.27 +int add_shader(const char *fname, unsigned int sdr);
    7.28 +int remove_shader(const char *fname);
    7.29 +
    7.30 +/* ---- gpu programs ---- */
    7.31 +unsigned int create_program(void);
    7.32 +unsigned int create_program_link(unsigned int sdr0, ...);
    7.33 +unsigned int create_program_load(const char *vfile, const char *pfile);
    7.34 +void free_program(unsigned int sdr);
    7.35 +
    7.36 +void attach_shader(unsigned int prog, unsigned int sdr);
    7.37 +int link_program(unsigned int prog);
    7.38 +int bind_program(unsigned int prog);
    7.39 +
    7.40 +int get_uniform_loc(unsigned int prog, const char *name);
    7.41 +
    7.42 +int set_uniform_int(unsigned int prog, const char *name, int val);
    7.43 +int set_uniform_float(unsigned int prog, const char *name, float val);
    7.44 +int set_uniform_float2(unsigned int prog, const char *name, float x, float y);
    7.45 +int set_uniform_float3(unsigned int prog, const char *name, float x, float y, float z);
    7.46 +int set_uniform_float4(unsigned int prog, const char *name, float x, float y, float z, float w);
    7.47 +int set_uniform_matrix4(unsigned int prog, const char *name, const float *mat);
    7.48 +int set_uniform_matrix4_transposed(unsigned int prog, const char *name, const float *mat);
    7.49 +
    7.50 +int get_attrib_loc(unsigned int prog, const char *name);
    7.51 +void set_attrib_float3(int attr_loc, float x, float y, float z);
    7.52 +
    7.53 +/* ---- shader composition ---- */
    7.54 +
    7.55 +/* clear shader header/footer text.
    7.56 + * pass the shader type to clear, or 0 to clear all types */
    7.57 +void clear_shader_header(unsigned int type);
    7.58 +void clear_shader_footer(unsigned int type);
    7.59 +/* append text to the header/footer of a specific shader type
    7.60 + * or use type 0 to add it to all shade types */
    7.61 +void add_shader_header(unsigned int type, const char *s);
    7.62 +void add_shader_footer(unsigned int type, const char *s);
    7.63 +/* get the current header/footer text for a specific shader type */
    7.64 +const char *get_shader_header(unsigned int type);
    7.65 +const char *get_shader_footer(unsigned int type);
    7.66 +
    7.67 +#ifdef __cplusplus
    7.68 +}
    7.69 +#endif	/* __cplusplus */
    7.70 +
    7.71 +#endif	/* SDR_H_ */

     8.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     8.2 +++ b/vertex.glsl	Sat Nov 18 20:04:16 2017 +0200
     8.3 @@ -0,0 +1,5 @@
     8.4 +void main()
     8.5 +{
     8.6 +	gl_Position = ftransform();
     8.7 +	gl_TexCoord[0] = gl_MultiTexCoord0;
     8.8 +}