Class: OpenGL::Buffer

Inherits:
Object
  • Object
show all
Defined in:
ext/opengl/gl_buffer.c

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.map(_target, _access) ⇒ Object 



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# File 'ext/opengl/gl_buffer.c', line 32

VALUE
rb_gl_buffer_s_map(VALUE klass, VALUE _target, VALUE _access) {
	struct buffer *buf = ALLOC(struct buffer);
	LOAD_GL_FUNC(glMapBuffer, "1.5");

	buf->target = RUBY2GLENUM(_target);
	buf->len		= 0;

	buf->ptr = fptr_glMapBuffer(buf->target, RUBY2GLENUM(_access));

	if (buf->ptr == NULL) {
		xfree(buf);
		CHECK_GLERROR_FROM("glMapBuffer");
	}

	return TypedData_Wrap_Struct(klass, &buffer_type, buf);
}

Instance Method Details

#addr ⇒ Object 



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# File 'ext/opengl/gl_buffer.c', line 50

static VALUE
rb_gl_buffer_addr(VALUE self) {
	struct buffer *buf;

	TypedData_Get_Struct(self, struct buffer, &buffer_type, buf);

	return SIZET2NUM((size_t)buf->ptr);
}

#length ⇒ Object 



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# File 'ext/opengl/gl_buffer.c', line 59

static VALUE
rb_gl_buffer_length(VALUE self) {
	struct buffer *buf;

	TypedData_Get_Struct(self, struct buffer, &buffer_type, buf);

	return RETCONV_GLsizeiptr(buf->len);
}

#read(*args) ⇒ Object 



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# File 'ext/opengl/gl_buffer.c', line 68

static VALUE
rb_gl_buffer_read(int argc, VALUE *argv, VALUE self) {
	struct buffer *buf;
	VALUE _length, _offset;
	GLsizeiptr offset, length;

	TypedData_Get_Struct(self, struct buffer, &buffer_type, buf);

	rb_scan_args(argc, argv, "02", &_length, &_offset);

	if (buf->len == 0 && NIL_P(_length))
		rb_raise(rb_eArgError, "length must be provided for unbounded buffer");

	length = NUM2SIZET(_length);

	if (NIL_P(_offset)) {
		offset = 0;
	} else {
		offset = NUM2SIZET(_offset);
	}

	if (buf->len != 0 && length + offset > buf->len)
		rb_raise(rb_eArgError, "read to %lu past end of buffer %lu",
				(unsigned long)(length + offset), (unsigned long)buf->len);

	return rb_str_new((char *)buf->ptr + offset, length);
}

#target ⇒ Object 



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# File 'ext/opengl/gl_buffer.c', line 96

static VALUE
rb_gl_buffer_target(VALUE self) {
	struct buffer *buf;

	TypedData_Get_Struct(self, struct buffer, &buffer_type, buf);

	return RETCONV_GLenum(buf->target);
}

#unmap ⇒ Object 



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# File 'ext/opengl/gl_buffer.c', line 105

static VALUE
rb_gl_buffer_unmap(VALUE self) {
	struct buffer *buf;
	LOAD_GL_FUNC(glUnmapBuffer, "1.5");

	TypedData_Get_Struct(self, struct buffer, &buffer_type, buf);

	if (!buf->ptr)
		return self;

	fptr_glUnmapBuffer(buf->target);

	CHECK_GLERROR_FROM("glUnmapBuffer");

	buf->ptr = NULL;
	buf->len = 0;
	buf->target = 0;

	return self;
}

#write(*args) ⇒ Object 



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# File 'ext/opengl/gl_buffer.c', line 126

static VALUE
rb_gl_buffer_write(int argc, VALUE *argv, VALUE self) {
	struct buffer *buf;
	VALUE _data, _offset;
	GLsizeiptr offset;
	long length;

	TypedData_Get_Struct(self, struct buffer, &buffer_type, buf);

	if (!buf->ptr)
		rb_raise(rb_eArgError, "write to unmapped buffer");

	rb_scan_args(argc, argv, "11", &_data, &_offset);

	if (NIL_P(_data))
		rb_raise(rb_eArgError, "cannot write nil to buffer");

	_data = rb_String(_data);

	length = RSTRING_LEN(_data);

	if (NIL_P(_offset)) {
		offset = 0;
	} else {
		offset = NUM2SIZET(_offset);
	}

	if (buf->len != 0 && length + offset > buf->len)
		rb_raise(rb_eArgError, "write to %lu past end of buffer %lu",
				(unsigned long)(length + offset), (unsigned long)buf->len);

	memcpy((char *)buf->ptr + offset, RSTRING_PTR(_data), RSTRING_LEN(_data));

	return self;
}