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U32 compile_glsl_shader(U32 type, const char *fname)
{
Arena *tmpa;
FLS src;
const char *csrc;
U32 id;
S32 status;
tmpa = alloc_arena(0);
src = sys_read_entire_file_fls(tmpa, fname);
if (!src.p) {
sys_printf("[ERROR] : Failed to read \"%s\"\n", fname);
return 0;
}
csrc = (const char *)src.p;
id = glCreateShader(type);
glShaderSource(id, 1, &csrc, 0);
glCompileShader(id);
glGetShaderiv(id, GL_COMPILE_STATUS, &status);
if (status == GL_FALSE) {
char log[512];
glGetShaderInfoLog(id, 512, 0, log);
sys_printf("[ERROR] : Failed to compile : \"%s\"\n%s", fname, log);
} else {
sys_printf("[INFO] : \"%s\" compiled successfully.\n", fname);
}
release_arena(tmpa);
return id;
}
Shader load_shader(const char *vfname, const char *gfname, const char *ffname)
{
Shader shader;
U32 vert, geom, frag;
S32 success;
shader.id = glCreateProgram();
if (vfname) {
vert = compile_glsl_shader(GL_VERTEX_SHADER, vfname);
glAttachShader(shader.id, vert);
}
if (gfname) {
geom = compile_glsl_shader(GL_GEOMETRY_SHADER, gfname);
glAttachShader(shader.id, geom);
}
if (ffname) {
frag = compile_glsl_shader(GL_FRAGMENT_SHADER, ffname);
glAttachShader(shader.id, frag);
}
glLinkProgram(shader.id);
glGetProgramiv(shader.id, GL_LINK_STATUS, &success);
if (success == GL_FALSE) {
char log[512];
glGetProgramInfoLog(shader.id, 512, 0, log);
sys_printf("[ERROR] : Failed to link shader program:\n%s", log);
} else {
sys_printf("[INFO] : Shader linked successfuly.\n\n");
}
if (vfname)
glDeleteShader(vert);
if (gfname)
glDeleteShader(geom);
if (ffname)
glDeleteShader(frag);
return shader;
}
void set3fv(U32 id, const char *name, V3 v)
{
S32 loc = glGetUniformLocation(id, name);
glUniform3fv(loc, 1, (F32 *)&v);
}
void set4fv(U32 id, const char *name, V4 v)
{
S32 loc = glGetUniformLocation(id, name);
glUniform4fv(loc, 1, (F32 *)&v);
}
void setmat4fv(U32 id, const char *name, MAT4 m)
{
S32 loc = glGetUniformLocation(id, name);
glUniformMatrix4fv(loc, 1, 0, (F32 *)&m);
}
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