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/*
* Copyright (C) 2018 Tomasz Kramkowski <tk@the-tk.com>
* SPDX-License-Identifier: MIT
*/
#include <assert.h>
#include <stdio.h>
#include <string.h>
#include "ensize.h"
#include "eprintf.h"
#include "glprog.h"
#include "mtl.h"
#include "tex.h"
struct mtl {
char name[50];
#define SH_TEX(_, name) GLuint name;
#include "shaders/data.h"
};
static struct mtl *mtls;
static int lmtls;
static size_t nmtls;
// tex_file: Load texture asset from file
GLuint tex_file(const char *name, const char *type)
{
char loc[100];
GLuint ret;
FILE *f;
snprintf(loc, sizeof loc, "assets/%s.%s.png", name, type);
f = fopen(loc, "rb");
if (f == NULL)
eprintf("Could not open '%s':", loc);
ret = png2tex(f);
fclose(f);
return ret;
}
// mtl_load: Load a set of textures as a material
int mtl_load(char *name)
{
struct mtl *m;
for (int i = 0; i < lmtls; i++)
if (strcmp(mtls[i].name, name) == 0)
return i;
mtls = ENSIZE(mtls, lmtls + 1, &nmtls, 16);
m = &mtls[lmtls];
snprintf(m->name, sizeof m->name, "%s", name);
#define SH_TEX(_, n) m->n = tex_file(name, #n);
#include "shaders/data.h"
return lmtls++;
}
// mtl_use: Set OpenGL state to use a certain material index
void mtl_use(int mtl)
{
assert(mtl < lmtls);
GLenum texture = GL_TEXTURE0;
// TODO: Blank textures or something
if (mtl < 0)
return;
#define SH_TEX(type, name) \
gl_tex_active(texture++); \
gl_tex_bind(GL_TEXTURE_##type, mtls[mtl].name);
#include "shaders/data.h"
}
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