/**
* Decide the buffer to render to.
*/
static enum st_attachment_type
choose_attachment(struct st_framebuffer_iface *stfbi)
{
enum st_attachment_type statt;
statt = stfbi->visual->render_buffer;
if (statt != ST_ATTACHMENT_INVALID) {
/* use the buffer given by the visual, unless it is unavailable */
if (!st_visual_have_buffers(stfbi->visual, 1 << statt)) {
switch (statt) {
case ST_ATTACHMENT_BACK_LEFT:
statt = ST_ATTACHMENT_FRONT_LEFT;
break;
case ST_ATTACHMENT_BACK_RIGHT:
statt = ST_ATTACHMENT_FRONT_RIGHT;
break;
default:
break;
}
if (!st_visual_have_buffers(stfbi->visual, 1 << statt))
statt = ST_ATTACHMENT_INVALID;
}
}
return statt;
}
/**
* Determine the default draw or read buffer from a visual.
*/
static void
st_visual_to_default_buffer(const struct st_visual *visual,
GLenum *buffer, GLint *index)
{
enum st_attachment_type statt;
GLenum buf;
gl_buffer_index idx;
statt = visual->render_buffer;
/* do nothing if an invalid render buffer is specified */
if (statt == ST_ATTACHMENT_INVALID ||
!st_visual_have_buffers(visual, 1 << statt))
return;
switch (statt) {
case ST_ATTACHMENT_FRONT_LEFT:
buf = GL_FRONT_LEFT;
idx = BUFFER_FRONT_LEFT;
break;
case ST_ATTACHMENT_BACK_LEFT:
buf = GL_BACK_LEFT;
idx = BUFFER_BACK_LEFT;
break;
case ST_ATTACHMENT_FRONT_RIGHT:
buf = GL_FRONT_RIGHT;
idx = BUFFER_FRONT_RIGHT;
break;
case ST_ATTACHMENT_BACK_RIGHT:
buf = GL_BACK_RIGHT;
idx = BUFFER_BACK_RIGHT;
break;
default:
buf = GL_NONE;
idx = BUFFER_COUNT;
break;
}
if (buf != GL_NONE) {
if (buffer)
*buffer = buf;
if (index)
*index = idx;
}
}
/**
* Update the attachments to validate by looping the existing renderbuffers.
*/
static void
st_framebuffer_update_attachments(struct st_framebuffer *stfb)
{
gl_buffer_index idx;
stfb->num_statts = 0;
for (idx = 0; idx < BUFFER_COUNT; idx++) {
struct st_renderbuffer *strb;
enum st_attachment_type statt;
strb = st_renderbuffer(stfb->Base.Attachment[idx].Renderbuffer);
if (!strb || strb->software)
continue;
statt = buffer_index_to_attachment(idx);
if (statt != ST_ATTACHMENT_INVALID &&
st_visual_have_buffers(stfb->iface->visual, 1 << statt))
stfb->statts[stfb->num_statts++] = statt;
}
stfb->stamp++;
}
/**
* Intialize a struct gl_config from a visual.
*/
static void
st_visual_to_context_mode(const struct st_visual *visual,
struct gl_config *mode)
{
memset(mode, 0, sizeof(*mode));
if (st_visual_have_buffers(visual, ST_ATTACHMENT_BACK_LEFT_MASK))
mode->doubleBufferMode = GL_TRUE;
if (st_visual_have_buffers(visual,
ST_ATTACHMENT_FRONT_RIGHT_MASK | ST_ATTACHMENT_BACK_RIGHT_MASK))
mode->stereoMode = GL_TRUE;
if (visual->color_format != PIPE_FORMAT_NONE) {
mode->rgbMode = GL_TRUE;
mode->redBits =
util_format_get_component_bits(visual->color_format,
UTIL_FORMAT_COLORSPACE_RGB, 0);
mode->greenBits =
util_format_get_component_bits(visual->color_format,
UTIL_FORMAT_COLORSPACE_RGB, 1);
mode->blueBits =
util_format_get_component_bits(visual->color_format,
UTIL_FORMAT_COLORSPACE_RGB, 2);
mode->alphaBits =
util_format_get_component_bits(visual->color_format,
UTIL_FORMAT_COLORSPACE_RGB, 3);
mode->rgbBits = mode->redBits +
mode->greenBits + mode->blueBits + mode->alphaBits;
}
if (visual->depth_stencil_format != PIPE_FORMAT_NONE) {
mode->depthBits =
util_format_get_component_bits(visual->depth_stencil_format,
UTIL_FORMAT_COLORSPACE_ZS, 0);
mode->stencilBits =
util_format_get_component_bits(visual->depth_stencil_format,
UTIL_FORMAT_COLORSPACE_ZS, 1);
mode->haveDepthBuffer = mode->depthBits > 0;
mode->haveStencilBuffer = mode->stencilBits > 0;
}
if (visual->accum_format != PIPE_FORMAT_NONE) {
mode->haveAccumBuffer = GL_TRUE;
mode->accumRedBits =
util_format_get_component_bits(visual->accum_format,
UTIL_FORMAT_COLORSPACE_RGB, 0);
mode->accumGreenBits =
util_format_get_component_bits(visual->accum_format,
UTIL_FORMAT_COLORSPACE_RGB, 1);
mode->accumBlueBits =
util_format_get_component_bits(visual->accum_format,
UTIL_FORMAT_COLORSPACE_RGB, 2);
mode->accumAlphaBits =
util_format_get_component_bits(visual->accum_format,
UTIL_FORMAT_COLORSPACE_RGB, 3);
}
if (visual->samples) {
mode->sampleBuffers = 1;
mode->samples = visual->samples;
}
}
