/**
* Clear the color buffer when glColorMask is in effect.
*/
static void
clear_rgba_buffer_with_masking(GLcontext *ctx, struct gl_renderbuffer *rb)
{
const GLint x = ctx->DrawBuffer->_Xmin;
const GLint y = ctx->DrawBuffer->_Ymin;
const GLint height = ctx->DrawBuffer->_Ymax - ctx->DrawBuffer->_Ymin;
const GLint width = ctx->DrawBuffer->_Xmax - ctx->DrawBuffer->_Xmin;
GLchan clearColor[4];
GLint i;
ASSERT(ctx->Visual.rgbMode);
ASSERT(rb->PutRow);
CLAMPED_FLOAT_TO_CHAN(clearColor[RCOMP], ctx->Color.ClearColor[0]);
CLAMPED_FLOAT_TO_CHAN(clearColor[GCOMP], ctx->Color.ClearColor[1]);
CLAMPED_FLOAT_TO_CHAN(clearColor[BCOMP], ctx->Color.ClearColor[2]);
CLAMPED_FLOAT_TO_CHAN(clearColor[ACOMP], ctx->Color.ClearColor[3]);
for (i = 0; i < height; i++) {
GLchan rgba[MAX_WIDTH][4];
GLint j;
for (j = 0; j < width; j++) {
COPY_CHAN4(rgba[j], clearColor);
}
_swrast_mask_rgba_array( ctx, rb, width, x, y + i, rgba );
rb->PutRow(ctx, rb, width, x, y + i, rgba, NULL);
}
}
/**
* Update swrast->_FogColor and swrast->_FogEnable values.
*/
static void
_swrast_update_fog_state( GLcontext *ctx )
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
/* convert fog color to GLchan values */
CLAMPED_FLOAT_TO_CHAN(swrast->_FogColor[RCOMP], ctx->Fog.Color[RCOMP]);
CLAMPED_FLOAT_TO_CHAN(swrast->_FogColor[GCOMP], ctx->Fog.Color[GCOMP]);
CLAMPED_FLOAT_TO_CHAN(swrast->_FogColor[BCOMP], ctx->Fog.Color[BCOMP]);
/* determine if fog is needed, and if so, which fog mode */
swrast->_FogEnabled = GL_FALSE;
if (ctx->FragmentProgram._Enabled) {
if (ctx->FragmentProgram.Current->Base.Target==GL_FRAGMENT_PROGRAM_ARB) {
const struct fragment_program *p
= (struct fragment_program *) ctx->FragmentProgram.Current;
if (p->FogOption != GL_NONE) {
swrast->_FogEnabled = GL_TRUE;
swrast->_FogMode = p->FogOption;
}
}
}
else if (ctx->Fog.Enabled) {
swrast->_FogEnabled = GL_TRUE;
swrast->_FogMode = ctx->Fog.Mode;
}
}
/**
* Clear the color buffer when glColorMask is in effect.
*/
static void
clear_rgba_buffer_with_masking(GLcontext *ctx, struct gl_renderbuffer *rb)
{
const GLint x = ctx->DrawBuffer->_Xmin;
const GLint y = ctx->DrawBuffer->_Ymin;
const GLint height = ctx->DrawBuffer->_Ymax - ctx->DrawBuffer->_Ymin;
const GLint width = ctx->DrawBuffer->_Xmax - ctx->DrawBuffer->_Xmin;
SWspan span;
GLint i;
ASSERT(ctx->Visual.rgbMode);
ASSERT(rb->PutRow);
/* Initialize color span with clear color */
/* XXX optimize for clearcolor == black/zero (bzero) */
INIT_SPAN(span, GL_BITMAP, width, 0, SPAN_RGBA);
span.array->ChanType = rb->DataType;
if (span.array->ChanType == GL_UNSIGNED_BYTE) {
GLubyte clearColor[4];
UNCLAMPED_FLOAT_TO_UBYTE(clearColor[RCOMP], ctx->Color.ClearColor[0]);
UNCLAMPED_FLOAT_TO_UBYTE(clearColor[GCOMP], ctx->Color.ClearColor[1]);
UNCLAMPED_FLOAT_TO_UBYTE(clearColor[BCOMP], ctx->Color.ClearColor[2]);
UNCLAMPED_FLOAT_TO_UBYTE(clearColor[ACOMP], ctx->Color.ClearColor[3]);
for (i = 0; i < width; i++) {
COPY_4UBV(span.array->rgba[i], clearColor);
}
}
else if (span.array->ChanType == GL_UNSIGNED_SHORT) {
GLushort clearColor[4];
UNCLAMPED_FLOAT_TO_USHORT(clearColor[RCOMP], ctx->Color.ClearColor[0]);
UNCLAMPED_FLOAT_TO_USHORT(clearColor[GCOMP], ctx->Color.ClearColor[1]);
UNCLAMPED_FLOAT_TO_USHORT(clearColor[BCOMP], ctx->Color.ClearColor[2]);
UNCLAMPED_FLOAT_TO_USHORT(clearColor[ACOMP], ctx->Color.ClearColor[3]);
for (i = 0; i < width; i++) {
COPY_4V(span.array->rgba[i], clearColor);
}
}
else {
ASSERT(span.array->ChanType == GL_FLOAT);
for (i = 0; i < width; i++) {
CLAMPED_FLOAT_TO_CHAN(span.array->rgba[i][0], ctx->Color.ClearColor[0]);
CLAMPED_FLOAT_TO_CHAN(span.array->rgba[i][1], ctx->Color.ClearColor[1]);
CLAMPED_FLOAT_TO_CHAN(span.array->rgba[i][2], ctx->Color.ClearColor[2]);
CLAMPED_FLOAT_TO_CHAN(span.array->rgba[i][3], ctx->Color.ClearColor[3]);
}
}
/* Note that masking will change the color values, but only the
* channels for which the write mask is GL_FALSE. The channels
* which which are write-enabled won't get modified.
*/
for (i = 0; i < height; i++) {
span.x = x;
span.y = y + i;
_swrast_mask_rgba_span(ctx, rb, &span);
/* write masked row */
rb->PutRow(ctx, rb, width, x, y + i, span.array->rgba, NULL);
}
}
void MesaDriver::ClearColor(GLcontext *ctx, const GLfloat color[4])
{
MesaDriver *md = (MesaDriver *) ctx->DriverCtx;
CLAMPED_FLOAT_TO_CHAN(md->m_clear_color[BE_RCOMP], color[0]);
CLAMPED_FLOAT_TO_CHAN(md->m_clear_color[BE_GCOMP], color[1]);
CLAMPED_FLOAT_TO_CHAN(md->m_clear_color[BE_BCOMP], color[2]);
CLAMPED_FLOAT_TO_CHAN(md->m_clear_color[BE_ACOMP], color[3]);
assert(md->m_bglview);
}
/*
* Clear the color buffer when glColorMask or glIndexMask is in effect.
*/
static void
clear_color_buffer_with_masking( GLcontext *ctx )
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
const GLint x = ctx->DrawBuffer->_Xmin;
const GLint y = ctx->DrawBuffer->_Ymin;
const GLint height = ctx->DrawBuffer->_Ymax - ctx->DrawBuffer->_Ymin;
const GLint width = ctx->DrawBuffer->_Xmax - ctx->DrawBuffer->_Xmin;
if (ctx->Visual.rgbMode) {
/* RGBA mode */
GLchan clearColor[4];
GLint i;
CLAMPED_FLOAT_TO_CHAN(clearColor[RCOMP], ctx->Color.ClearColor[0]);
CLAMPED_FLOAT_TO_CHAN(clearColor[GCOMP], ctx->Color.ClearColor[1]);
CLAMPED_FLOAT_TO_CHAN(clearColor[BCOMP], ctx->Color.ClearColor[2]);
CLAMPED_FLOAT_TO_CHAN(clearColor[ACOMP], ctx->Color.ClearColor[3]);
for (i = 0; i < height; i++) {
GLchan rgba[MAX_WIDTH][4];
GLint j;
for (j = 0; j < width; j++) {
COPY_CHAN4(rgba[j], clearColor);
}
_swrast_mask_rgba_array( ctx, width, x, y + i, rgba );
(*swrast->Driver.WriteRGBASpan)( ctx, width, x, y + i,
(CONST GLchan (*)[4]) rgba, NULL );
}
}
else {
/* Color index mode */
GLuint span[MAX_WIDTH];
GLubyte mask[MAX_WIDTH];
GLint i, j;
MEMSET( mask, 1, width );
for (i=0;i<height;i++) {
for (j=0;j<width;j++) {
span[j] = ctx->Color.ClearIndex;
}
_swrast_mask_index_array( ctx, width, x, y + i, span );
(*swrast->Driver.WriteCI32Span)( ctx, width, x, y + i, span, mask );
}
}
}
/*
* Clear a color buffer without index/channel masking.
*/
static void
clear_color_buffer(GLcontext *ctx)
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
const GLint x = ctx->DrawBuffer->_Xmin;
const GLint y = ctx->DrawBuffer->_Ymin;
const GLint height = ctx->DrawBuffer->_Ymax - ctx->DrawBuffer->_Ymin;
const GLint width = ctx->DrawBuffer->_Xmax - ctx->DrawBuffer->_Xmin;
if (ctx->Visual.rgbMode) {
/* RGBA mode */
GLchan clearColor[4];
GLint i;
CLAMPED_FLOAT_TO_CHAN(clearColor[RCOMP], ctx->Color.ClearColor[0]);
CLAMPED_FLOAT_TO_CHAN(clearColor[GCOMP], ctx->Color.ClearColor[1]);
CLAMPED_FLOAT_TO_CHAN(clearColor[BCOMP], ctx->Color.ClearColor[2]);
CLAMPED_FLOAT_TO_CHAN(clearColor[ACOMP], ctx->Color.ClearColor[3]);
ASSERT(*((GLuint *) &ctx->Color.ColorMask) == 0xffffffff);
ASSERT(swrast->Driver.WriteRGBASpan);
for (i = 0; i < height; i++) {
(*swrast->Driver.WriteMonoRGBASpan)( ctx, width, x, y + i,
clearColor, NULL );
}
}
else {
/* Color index mode */
GLint i;
ASSERT((ctx->Color.IndexMask & ((1 << ctx->Visual.indexBits) - 1))
== (GLuint) ((1 << ctx->Visual.indexBits) - 1));
ASSERT(swrast->Driver.WriteMonoCISpan);
for (i = 0; i < height; i++) {
(*swrast->Driver.WriteMonoCISpan)( ctx, width, x, y + i,
ctx->Color.ClearIndex, NULL);
}
}
}
/**
* \fn GLint _swrast_alpha_test( const GLcontext *ctx, struct sw_span *span )
* \brief Apply the alpha test to a span of pixels.
* \return
* - "0" = all pixels in the span failed the alpha test.
* - "1" = one or more pixels passed the alpha test.
*/
GLint
_swrast_alpha_test( const GLcontext *ctx, struct sw_span *span )
{
const GLchan (*rgba)[4] = (const GLchan (*)[4]) span->array->rgba;
GLchan ref;
const GLuint n = span->end;
GLubyte *mask = span->array->mask;
GLuint i;
CLAMPED_FLOAT_TO_CHAN(ref, ctx->Color.AlphaRef);
if (span->arrayMask & SPAN_RGBA) {
/* Use the array values */
switch (ctx->Color.AlphaFunc) {
case GL_LESS:
for (i = 0; i < n; i++)
mask[i] &= (rgba[i][ACOMP] < ref);
break;
case GL_LEQUAL:
for (i = 0; i < n; i++)
mask[i] &= (rgba[i][ACOMP] <= ref);
break;
case GL_GEQUAL:
for (i = 0; i < n; i++)
mask[i] &= (rgba[i][ACOMP] >= ref);
break;
case GL_GREATER:
for (i = 0; i < n; i++)
mask[i] &= (rgba[i][ACOMP] > ref);
break;
case GL_NOTEQUAL:
for (i = 0; i < n; i++)
mask[i] &= (rgba[i][ACOMP] != ref);
break;
case GL_EQUAL:
for (i = 0; i < n; i++)
mask[i] &= (rgba[i][ACOMP] == ref);
break;
case GL_ALWAYS:
/* do nothing */
return 1;
case GL_NEVER:
/* caller should check for zero! */
span->writeAll = GL_FALSE;
return 0;
default:
_mesa_problem( ctx, "Invalid alpha test in _swrast_alpha_test" );
return 0;
}
}
else {
/* Use the interpolation values */
#if CHAN_TYPE == GL_FLOAT
const GLfloat alphaStep = span->alphaStep;
GLfloat alpha = span->alpha;
ASSERT(span->interpMask & SPAN_RGBA);
switch (ctx->Color.AlphaFunc) {
case GL_LESS:
for (i = 0; i < n; i++) {
mask[i] &= (alpha < ref);
alpha += alphaStep;
}
break;
case GL_LEQUAL:
for (i = 0; i < n; i++) {
mask[i] &= (alpha <= ref);
alpha += alphaStep;
}
break;
case GL_GEQUAL:
for (i = 0; i < n; i++) {
mask[i] &= (alpha >= ref);
alpha += alphaStep;
}
break;
case GL_GREATER:
for (i = 0; i < n; i++) {
mask[i] &= (alpha > ref);
alpha += alphaStep;
}
break;
case GL_NOTEQUAL:
for (i = 0; i < n; i++) {
mask[i] &= (alpha != ref);
alpha += alphaStep;
}
break;
case GL_EQUAL:
for (i = 0; i < n; i++) {
mask[i] &= (alpha == ref);
alpha += alphaStep;
}
break;
case GL_ALWAYS:
/* do nothing */
return 1;
case GL_NEVER:
/* caller should check for zero! */
span->writeAll = GL_FALSE;
return 0;
default:
_mesa_problem( ctx, "Invalid alpha test in gl_alpha_test" );
return 0;
}
#else
/* 8 or 16-bit channel interpolation */
const GLfixed alphaStep = span->alphaStep;
GLfixed alpha = span->alpha;
ASSERT(span->interpMask & SPAN_RGBA);
switch (ctx->Color.AlphaFunc) {
case GL_LESS:
for (i = 0; i < n; i++) {
mask[i] &= (FixedToChan(alpha) < ref);
alpha += alphaStep;
}
break;
case GL_LEQUAL:
for (i = 0; i < n; i++) {
mask[i] &= (FixedToChan(alpha) <= ref);
alpha += alphaStep;
}
break;
case GL_GEQUAL:
for (i = 0; i < n; i++) {
mask[i] &= (FixedToChan(alpha) >= ref);
alpha += alphaStep;
}
break;
case GL_GREATER:
for (i = 0; i < n; i++) {
mask[i] &= (FixedToChan(alpha) > ref);
alpha += alphaStep;
}
break;
case GL_NOTEQUAL:
for (i = 0; i < n; i++) {
mask[i] &= (FixedToChan(alpha) != ref);
alpha += alphaStep;
}
break;
case GL_EQUAL:
for (i = 0; i < n; i++) {
mask[i] &= (FixedToChan(alpha) == ref);
alpha += alphaStep;
}
break;
case GL_ALWAYS:
/* do nothing */
return 1;
case GL_NEVER:
/* caller should check for zero! */
span->writeAll = GL_FALSE;
return 0;
default:
_mesa_problem( ctx, "Invalid alpha test in gl_alpha_test" );
return 0;
}
#endif /* CHAN_TYPE */
}
#if 0
/* XXXX This causes conformance failures!!!! */
while ((span->start <= span->end) &&
(mask[span->start] == 0))
span->start ++;
while ((span->end >= span->start) &&
(mask[span->end] == 0))
span->end --;
#endif
span->writeAll = GL_FALSE;
if (span->start >= span->end)
return 0;
else
return 1;
}
