/*
Define the words 'pi and 'e.
*/
void defineWords( UThread* ut )
{
static double constants[2] = { 3.14159265358979, 2.71828182845904 };
UAtom atoms[2];
UBuffer* ctx;
UCell* cell;
int i;
ur_internAtoms( ut, "pi e", atoms );
ctx = ur_threadContext( ut );
for( i = 0; i < 2; ++i )
{
cell = ur_ctxAddWord( ctx, atoms[i] );
ur_setId( cell, UT_DECIMAL );
ur_decimal(cell) = constants[i];
}
ur_ctxSort( ctx );
}
/*
Sets res to either a shader! or a context! whose first value is a shader!.
Returns UR_OK/UR_THROW.
*/
int ur_makeShader( UThread* ut, const char* vert, const char* frag, UCell* res )
{
#define MAX_SHADER_PARAM 16 // LIMIT: User parameters per shader.
Shader shad;
Shader* sh;
UIndex bufN;
UBuffer* buf;
int i;
char name[ 128 ];
ShaderParam param[ MAX_SHADER_PARAM ];
ShaderParam* pi;
GLsizei length;
GLint size;
GLenum type;
GLint count = 0;
if( ! createShader( ut, &shad, vert, frag ) )
return UR_THROW;
glGetProgramiv( shad.program, GL_ACTIVE_UNIFORMS, &count );
// Collect non-gl parameters.
pi = param;
for( i = 0; i < count; ++i )
{
glGetActiveUniform( shad.program, i, 128, &length, &size, &type,
name );
if( name[0] == 'g' && name[1] == 'l' && name[2] == '_' )
continue;
pi->type = type;
pi->location = glGetUniformLocation( shad.program, name );
pi->name = ur_internAtom( ut, name, name + length );
if( pi->name == UR_INVALID_ATOM )
return UR_THROW;
++pi;
}
count = pi - param;
if( count )
{
ShaderParam* pend;
UBuffer* ctx;
UCell* cval;
// We have parameters - make context to hold shader & params.
ctx = ur_makeContextCell( ut, count + 1, res );
cval = ur_ctxAddWord( ctx, UR_ATOM_SHADER );
pi = param;
pend = param + count;
while( pi != pend )
{
cval = ur_ctxAddWord( ctx, pi->name );
#if 0
printf( "KR Shader Param %d is type %d\n",
(int) (pi - param), pi->type );
#endif
switch( pi->type )
{
case GL_FLOAT:
ur_setId( cval, UT_DECIMAL );
ur_decimal( cval ) = 0.0;
break;
case GL_FLOAT_VEC2:
case GL_FLOAT_VEC3:
//case GL_FLOAT_VEC4:
ur_setId( cval, UT_VEC3 );
cval->vec3.xyz[0] =
cval->vec3.xyz[1] =
cval->vec3.xyz[2] = 0.0f;
break;
case GL_INT:
ur_setId( cval, UT_INT );
ur_int( cval ) = 0;
break;
case GL_INT_VEC2:
case GL_INT_VEC3:
//case GL_INT_VEC4:
ur_setId( cval, UT_COORD );
break;
case GL_BOOL:
ur_setId( cval, UT_LOGIC );
ur_int( cval ) = 0;
break;
case GL_SAMPLER_2D:
case GL_SAMPLER_CUBE:
#ifndef GL_ES_VERSION_2_0
case GL_SAMPLER_1D:
case GL_SAMPLER_3D:
case GL_SAMPLER_1D_SHADOW:
case GL_SAMPLER_2D_SHADOW:
#endif
ur_setId( cval, UT_NONE );
ur_texId(cval) = 0; // Expecting texture!.
break;
#ifdef GL_ES_VERSION_2_0
case GL_FLOAT_MAT4:
ur_setId( cval, UT_NONE );
break;
#endif
default:
ur_setId( cval, UT_NONE );
break;
/*
GL_BOOL_VEC2:
GL_BOOL_VEC3:
GL_BOOL_VEC4:
GL_FLOAT_MAT2:
GL_FLOAT_MAT3:
GL_FLOAT_MAT4:
GL_SAMPLER_2D_RECT:
GL_SAMPLER_2D_RECT_SHADOW:
*/
}
++pi;
}
ur_ctxSort( ctx );
}
ur_genBuffers( ut, 1, &bufN );
buf = ur_buffer( bufN );
buf->type = UT_SHADER;
buf->ptr.v = memAlloc( sizeof(Shader) +
sizeof(ShaderParam) * (count - 1) );
sh = (Shader*) buf->ptr.v;
sh->program = shad.program;
sh->paramCount = count;
if( count )
{
memCpy( sh->param, param, sizeof(ShaderParam) * count );
// First context value will be set to shader!.
res = ur_buffer( res->series.buf )->ptr.cell;
}
ur_setId( res, UT_SHADER );
ur_setSeries( res, bufN, 0 );
return UR_OK;
}
