accelerants/ati/overlay.cpp

67 	// Note:  When allocating buffers, buffer allocation starts at the end of
68 	// video memory, and works backward to the end of the video frame buffer.
70 	// objects which are ordered by the buffer address with the first object
71 	// in the list having the highest buffer address.
82 	// Calculate required buffer size as a multiple of 1K.
89 	// the address where the buffer area will start.  Leave a gap of about 4K
91 	// thus, if the overlay buffer overflows it will be less apt to affect the
98 		// buffer and the start of the previous buffer to allocate the new
99 		// buffer.
101 		addr_t currentBuffEndAddr = (addr_t)ovBuff->buffer + ovBuff->size;
103 			break;		// sufficient space for the new buffer
105 		prevBuffAddr = (addr_t)ovBuff->buffer;
114 		// thus space must be allocated between the last buffer and the end of
115 		// the video frame buffer.  Compute where current video frame buffer
117 		// the new buffer to be created.
127 					"byte buffer\n", buffSize, buffSize);
128 			return NULL;	// insufficient space for buffer
146 	ovBuff->buffer = (void*)(prevBuffAddr - buffSize);
148 		+ ((addr_t)ovBuff->buffer - si.videoMemAddr));
156 	TRACE("AllocateOverlayBuffer() allocated %ld (0x%lx) byte buffer at 0x%lx\n",
157 		buffSize, buffSize, ovBuff->buffer);
163 ReleaseOverlayBuffer(const overlay_buffer* buffer)
167 	if (buffer == NULL)
170 	// Find the buffer to be released.
176 		if (ovBuff->buffer == buffer->buffer) {
193 	TRACE("ReleaseOverlayBuffer() buffer to release at 0x%lx not found\n",
194 		buffer->buffer);
195 	return B_ERROR;		// buffer to be released not found in chain of buffers
200 GetOverlayConstraints(const display_mode* mode, const overlay_buffer* buffer,
203 	if ((mode == NULL) || (buffer == NULL) || (constraints == NULL))
210 	if (buffer->space == B_YCbCr422)
214 			buffer->space);
223 	constraints->view.width.max = buffer->width;
224 	constraints->view.height.max = buffer->height;
283 ConfigureOverlay(overlay_token overlayToken, const overlay_buffer* buffer,
291 	if (buffer == NULL)
305 		if (!Mach64_DisplayOverlay(window, buffer)) {
311 		if (!Rage128_DisplayOverlay(window, buffer)) {