/**
* Software fallback for glAccum.
*/
void
_swrast_Accum(GLcontext *ctx, GLenum op, GLfloat value)
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
GLint xpos, ypos, width, height;
if (SWRAST_CONTEXT(ctx)->NewState)
_swrast_validate_derived( ctx );
if (!ctx->DrawBuffer->Attachment[BUFFER_ACCUM].Renderbuffer) {
_mesa_warning(ctx, "Calling glAccum() without an accumulation buffer");
return;
}
RENDER_START(swrast, ctx);
/* Compute region after calling RENDER_START so that we know the
* drawbuffer's size/bounds are up to date.
*/
xpos = ctx->DrawBuffer->_Xmin;
ypos = ctx->DrawBuffer->_Ymin;
width = ctx->DrawBuffer->_Xmax - ctx->DrawBuffer->_Xmin;
height = ctx->DrawBuffer->_Ymax - ctx->DrawBuffer->_Ymin;
switch (op) {
case GL_ADD:
if (value != 0.0F) {
accum_add(ctx, value, xpos, ypos, width, height);
}
break;
case GL_MULT:
if (value != 1.0F) {
accum_mult(ctx, value, xpos, ypos, width, height);
}
break;
case GL_ACCUM:
if (value != 0.0F) {
accum_accum(ctx, value, xpos, ypos, width, height);
}
break;
case GL_LOAD:
accum_load(ctx, value, xpos, ypos, width, height);
break;
case GL_RETURN:
accum_return(ctx, value, xpos, ypos, width, height);
break;
default:
_mesa_problem(ctx, "invalid mode in _swrast_Accum()");
break;
}
RENDER_FINISH(swrast, ctx);
}
static void
st_Accum(GLcontext *ctx, GLenum op, GLfloat value)
{
struct st_context *st = ctx->st;
struct st_renderbuffer *acc_strb
= st_renderbuffer(ctx->DrawBuffer->Attachment[BUFFER_ACCUM].Renderbuffer);
struct st_renderbuffer *color_strb
= st_renderbuffer(ctx->ReadBuffer->_ColorReadBuffer);
const GLint xpos = ctx->DrawBuffer->_Xmin;
const GLint ypos = ctx->DrawBuffer->_Ymin;
const GLint width = ctx->DrawBuffer->_Xmax - xpos;
const GLint height = ctx->DrawBuffer->_Ymax - ypos;
if(!acc_strb->data)
return;
/* make sure color bufs aren't cached */
st_flush( st, PIPE_FLUSH_RENDER_CACHE, NULL );
switch (op) {
case GL_ADD:
if (value != 0.0F) {
accum_mad(ctx, 1.0, value, xpos, ypos, width, height, acc_strb);
}
break;
case GL_MULT:
if (value != 1.0F) {
accum_mad(ctx, value, 0.0, xpos, ypos, width, height, acc_strb);
}
break;
case GL_ACCUM:
if (value != 0.0F) {
accum_accum(st, value, xpos, ypos, width, height, acc_strb, color_strb);
}
break;
case GL_LOAD:
accum_load(st, value, xpos, ypos, width, height, acc_strb, color_strb);
break;
case GL_RETURN:
accum_return(ctx, value, xpos, ypos, width, height, acc_strb, color_strb);
break;
default:
assert(0);
}
}
/**
* Software fallback for glAccum. A hardware driver that supports
* signed 16-bit color channels could implement hardware accumulation
* operations, but no driver does so at this time.
*/
void
_mesa_accum(struct gl_context *ctx, GLenum op, GLfloat value)
{
GLint xpos, ypos, width, height;
if (!ctx->DrawBuffer->Attachment[BUFFER_ACCUM].Renderbuffer) {
_mesa_warning(ctx, "Calling glAccum() without an accumulation buffer");
return;
}
if (!_mesa_check_conditional_render(ctx))
return;
xpos = ctx->DrawBuffer->_Xmin;
ypos = ctx->DrawBuffer->_Ymin;
width = ctx->DrawBuffer->_Xmax - ctx->DrawBuffer->_Xmin;
height = ctx->DrawBuffer->_Ymax - ctx->DrawBuffer->_Ymin;
switch (op) {
case GL_ADD:
if (value != 0.0F) {
accum_scale_or_bias(ctx, value, xpos, ypos, width, height, GL_TRUE);
}
break;
case GL_MULT:
if (value != 1.0F) {
accum_scale_or_bias(ctx, value, xpos, ypos, width, height, GL_FALSE);
}
break;
case GL_ACCUM:
if (value != 0.0F) {
accum_or_load(ctx, value, xpos, ypos, width, height, GL_FALSE);
}
break;
case GL_LOAD:
accum_or_load(ctx, value, xpos, ypos, width, height, GL_TRUE);
break;
case GL_RETURN:
accum_return(ctx, value, xpos, ypos, width, height);
break;
default:
_mesa_problem(ctx, "invalid mode in _mesa_accum()");
break;
}
}
