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/*
* Copyright (C) 2018, 2022 Tomasz Kramkowski <tk@the-tk.com>
* SPDX-License-Identifier: MIT
*/
#include <assert.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "eprintf.h"
#include "gl.h"
#include "glprog.h"
#include "nelem.h"
enum {
LOGSIZE = 1024,
};
struct glprog_progs prog;
static const struct {
GLuint type;
const char *name;
bool reqd;
const char *pre;
} langs[] = {
{ GL_VERTEX_SHADER, "vert", true,
#define SH_IN(type, name) "in " #type " " #name ";\n"
#include "shaders/data.h"
"out iface {\n"
#define SH_IF(type, name) "\t" #type " " #name ";\n"
#include "shaders/data.h"
"} o;\n"
},
{ GL_TESS_CONTROL_SHADER, "tesc", false, "" },
{ GL_TESS_EVALUATION_SHADER, "tese", false, "" },
{ GL_GEOMETRY_SHADER, "geom", false, "" },
{ GL_FRAGMENT_SHADER, "frag", true,
#define SH_TEX(type, name) "uniform sampler" #type " t" #name ";\n"
#define SH_OUT(type, name) "out " #type " " #name ";\n"
#include "shaders/data.h"
"in iface {\n"
#define SH_IF(type, name) "\t" #type " " #name ";\n"
#include "shaders/data.h"
"} i;\n"
},
};
// readfile: read a whole file into a buffer
static bool readfile(char **data, size_t *size, const char *name)
{
FILE *f;
size_t len = 0;
assert(data != NULL);
assert(size != NULL);
assert(name != NULL);
f = fopen(name, "rb");
if (f == NULL) return false;
if (*size < 1024) {
*size = 1024;
*data = erealloc(*data, *size);
}
while (true) {
size_t read = fread(*data + len, 1, *size - len, f);
len += read;
if (*size - len > 0) break;
*size *= 2;
*data = erealloc(*data, *size);
}
fclose(f);
*size = len;
*data = erealloc(*data, *size);
return true;
}
// compile: compile shader component
static GLuint compile(const char *src, size_t len, const char *pre, GLuint type)
{
GLuint id;
GLint success;
static const char *common_pre =
#define SH_VER(v) "#version " v "\n"
#define SH_UNI(type, name) "uniform " #type " " #name ";\n"
#include "shaders/data.h"
;
const char *srcs[] = { common_pre, pre, src };
GLint lens[] = { -1, -1, len };
id = gl_shdr_create(type);
gl_shdr_source(id, NELEM(srcs), srcs, lens);
gl_shdr_compile(id);
gl_shdr_param(id, GL_COMPILE_STATUS, &success);
if (!success) {
char log[LOGSIZE];
gl_shdr_infolog(id, sizeof log, NULL, log);
eprintf("Failed to compile shader:\n%s", log);
}
return id;
}
static void detach_shaders(GLuint prog)
{
GLsizei count;
GLuint shdr;
while (gl_prog_getshdrs(prog, 1, &count, &shdr), count)
gl_prog_detachshdr(prog, shdr);
}
static void load_shader(struct shader *s, const char *path)
{
GLuint prog;
GLint success, pos = 0;
char *full, *src = NULL;
size_t srclen = 0, fullsz;
GLint texture = 0;
assert(s != NULL);
assert(path != NULL);
fullsz = strlen(path) + strlen("/xxxx.glsl") + 1;
assert(fullsz > strlen(path));
full = emalloc(fullsz);
prog = gl_prog_create();
for (size_t i = 0; i < NELEM(langs); i++) {
GLuint shdr;
snprintf(full, fullsz, "%s/%s.glsl", path, langs[i].name);
if (!readfile(&src, &srclen, full)) {
if (!langs[i].reqd) continue;
eprintf("Could not load shader file %s:\n", full);
}
shdr = compile(src, srclen, langs[i].pre, langs[i].type);
gl_prog_attachshdr(prog, shdr);
gl_shdr_del(shdr);
}
free(src);
free(full);
#define SH_IN(_, name) gl_attr_bindloc(prog, pos++, #name);
#include "shaders/data.h"
gl_prog_link(prog);
gl_prog_param(prog, GL_LINK_STATUS, &success);
if (!success) {
char log[LOGSIZE];
gl_prog_infolog(prog, sizeof log, NULL, log);
eprintf("Failed to link program\n%s", log);
}
detach_shaders(prog);
gl_prog_use(prog);
#define SH_UNI(_, name) s->uni.name = gl_uni_loc(prog, #name);
#define SH_TEX(_, name) gl_uni_set1i(gl_uni_loc(prog, "t" #name), texture++);
#include "shaders/data.h"
s->prog = prog;
}
// glprog_init: compile and link all shader programs
void glprog_init(void)
{
GLint pos = 0;
#define SH_PROG(name) load_shader(&prog.name, "shaders/" #name);
#define SH_IN(_, name) prog.attr.name = pos++;
#include "shaders/data.h"
}
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