/**
* Determine if we can defer texturing/shading until after Z/stencil
* testing. This potentially allows us to skip texturing/shading for
* lots of fragments.
*/
static void
_swrast_update_deferred_texture(struct gl_context *ctx)
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
if (ctx->Color.AlphaEnabled) {
/* alpha test depends on post-texture/shader colors */
swrast->_DeferredTexture = GL_FALSE;
}
else {
GLboolean use_fprog = _swrast_use_fragment_program(ctx);
const struct gl_fragment_program *fprog
= ctx->FragmentProgram._Current;
if (use_fprog && (fprog->Base.OutputsWritten & (1 << FRAG_RESULT_DEPTH))) {
/* Z comes from fragment program/shader */
swrast->_DeferredTexture = GL_FALSE;
}
else if (use_fprog && fprog->UsesKill) {
swrast->_DeferredTexture = GL_FALSE;
}
else if (ctx->Query.CurrentOcclusionObject) {
/* occlusion query depends on shader discard/kill results */
swrast->_DeferredTexture = GL_FALSE;
}
else {
swrast->_DeferredTexture = GL_TRUE;
}
}
}
/**
* Update state for running fragment programs. Basically, load the
* program parameters with current state values.
*/
static void
_swrast_update_fragment_program(struct gl_context *ctx, GLbitfield newState)
{
if (!_swrast_use_fragment_program(ctx))
return;
_mesa_load_state_parameters(ctx,
ctx->FragmentProgram._Current->Base.Parameters);
}
/**
* Update the _PreferPixelFog field to indicate if we need to compute
* fog blend factors (from the fog coords) per-fragment.
*/
static void
_swrast_update_fog_hint( struct gl_context *ctx )
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
swrast->_PreferPixelFog = (!swrast->AllowVertexFog ||
_swrast_use_fragment_program(ctx) ||
(ctx->Hint.Fog == GL_NICEST &&
swrast->AllowPixelFog));
}
/**
* Update swrast->_ActiveAttribs, swrast->_NumActiveAttribs,
* swrast->_ActiveAtttribMask.
*/
static void
_swrast_update_active_attribs(struct gl_context *ctx)
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
GLbitfield64 attribsMask;
/*
* Compute _ActiveAttribsMask = which fragment attributes are needed.
*/
if (_swrast_use_fragment_program(ctx)) {
/* fragment program/shader */
attribsMask = ctx->FragmentProgram._Current->Base.InputsRead;
attribsMask &= ~VARYING_BIT_POS; /* WPOS is always handled specially */
}
else if (ctx->ATIFragmentShader._Enabled) {
attribsMask = VARYING_BIT_COL0 | VARYING_BIT_COL1 |
VARYING_BIT_FOGC | VARYING_BITS_TEX_ANY;
}
else {
/* fixed function */
attribsMask = 0x0;
#if CHAN_TYPE == GL_FLOAT
attribsMask |= VARYING_BIT_COL0;
#endif
if (ctx->Fog.ColorSumEnabled ||
(ctx->Light.Enabled &&
ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR)) {
attribsMask |= VARYING_BIT_COL1;
}
if (swrast->_FogEnabled)
attribsMask |= VARYING_BIT_FOGC;
attribsMask |= (ctx->Texture._EnabledCoordUnits << VARYING_SLOT_TEX0);
}
swrast->_ActiveAttribMask = attribsMask;
/* Update _ActiveAttribs[] list */
{
GLuint i, num = 0;
for (i = 0; i < VARYING_SLOT_MAX; i++) {
if (attribsMask & BITFIELD64_BIT(i)) {
swrast->_ActiveAttribs[num++] = i;
/* how should this attribute be interpolated? */
if (i == VARYING_SLOT_COL0 || i == VARYING_SLOT_COL1)
swrast->_InterpMode[i] = ctx->Light.ShadeModel;
else
swrast->_InterpMode[i] = GL_SMOOTH;
}
}
swrast->_NumActiveAttribs = num;
}
}
/**
* Update swrast->_FogColor and swrast->_FogEnable values.
*/
static void
_swrast_update_fog_state( struct gl_context *ctx )
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
const struct gl_fragment_program *fp = ctx->FragmentProgram._Current;
assert(fp == NULL || fp->Base.Target == GL_FRAGMENT_PROGRAM_ARB);
/* determine if fog is needed, and if so, which fog mode */
swrast->_FogEnabled = (!_swrast_use_fragment_program(ctx) &&
ctx->Fog.Enabled);
}
/**
* See if we can do early diffuse+specular (primary+secondary) color
* add per vertex instead of per-fragment.
*/
static void
_swrast_update_specular_vertex_add(struct gl_context *ctx)
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
GLboolean separateSpecular = ctx->Fog.ColorSumEnabled ||
(ctx->Light.Enabled &&
ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR);
swrast->SpecularVertexAdd = (separateSpecular
&& ctx->Texture._MaxEnabledTexImageUnit == -1
&& !_swrast_use_fragment_program(ctx)
&& !ctx->ATIFragmentShader._Enabled);
}
/**
* Determine which line drawing function to use given the current
* rendering context.
*
* Please update the summary flag _SWRAST_NEW_LINE if you add or remove
* tests to this code.
*/
void
_swrast_choose_line( struct gl_context *ctx )
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
GLboolean specular = (ctx->Fog.ColorSumEnabled ||
(ctx->Light.Enabled &&
ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR));
if (ctx->RenderMode == GL_RENDER) {
if (ctx->Line.SmoothFlag) {
/* antialiased lines */
_swrast_choose_aa_line_function(ctx);
ASSERT(swrast->Line);
}
else if (ctx->Texture._EnabledCoordUnits
|| _swrast_use_fragment_program(ctx)
|| swrast->_FogEnabled
|| specular) {
USE(general_line);
}
else if (ctx->Depth.Test
|| ctx->Line.Width != 1.0
|| ctx->Line.StippleFlag) {
/* no texture, but Z, fog, width>1, stipple, etc. */
#if CHAN_BITS == 32
USE(general_line);
#else
USE(rgba_line);
#endif
}
else {
ASSERT(!ctx->Depth.Test);
ASSERT(ctx->Line.Width == 1.0);
/* simple lines */
USE(simple_no_z_rgba_line);
}
}
else if (ctx->RenderMode == GL_FEEDBACK) {
USE(_swrast_feedback_line);
}
else {
ASSERT(ctx->RenderMode == GL_SELECT);
USE(_swrast_select_line);
}
}
/*
* Examine GL state and set swrast->Triangle to an
* appropriate antialiased triangle rasterizer function.
*/
void
_swrast_set_aa_triangle_function(struct gl_context *ctx)
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
ASSERT(ctx->Polygon.SmoothFlag);
if (ctx->Texture._EnabledCoordUnits != 0
|| _swrast_use_fragment_program(ctx)
|| swrast->_FogEnabled
|| _mesa_need_secondary_color(ctx)) {
SWRAST_CONTEXT(ctx)->Triangle = general_aa_tri;
}
else {
SWRAST_CONTEXT(ctx)->Triangle = rgba_aa_tri;
}
ASSERT(SWRAST_CONTEXT(ctx)->Triangle);
}
void
_swrast_choose_aa_line_function(struct gl_context *ctx)
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
ASSERT(ctx->Line.SmoothFlag);
if (ctx->Texture._EnabledCoordUnits != 0
|| _swrast_use_fragment_program(ctx)
|| (ctx->Light.Enabled &&
ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR)
|| ctx->Fog.ColorSumEnabled
|| swrast->_FogEnabled) {
swrast->Line = aa_general_rgba_line;
}
else {
swrast->Line = aa_rgba_line;
}
}
/**
* Recompute the value of swrast->_RasterMask, etc. according to
* the current context. The _RasterMask field can be easily tested by
* drivers to determine certain basic GL state (does the primitive need
* stenciling, logic-op, fog, etc?).
*/
static void
_swrast_update_rasterflags( struct gl_context *ctx )
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
GLbitfield rasterMask = 0;
GLuint i;
if (ctx->Color.AlphaEnabled) rasterMask |= ALPHATEST_BIT;
if (ctx->Color.BlendEnabled) rasterMask |= BLEND_BIT;
if (ctx->Depth.Test) rasterMask |= DEPTH_BIT;
if (swrast->_FogEnabled) rasterMask |= FOG_BIT;
if (ctx->Scissor.EnableFlags) rasterMask |= CLIP_BIT;
if (ctx->Stencil._Enabled) rasterMask |= STENCIL_BIT;
for (i = 0; i < ctx->Const.MaxDrawBuffers; i++) {
if (!ctx->Color.ColorMask[i][0] ||
!ctx->Color.ColorMask[i][1] ||
!ctx->Color.ColorMask[i][2] ||
!ctx->Color.ColorMask[i][3]) {
rasterMask |= MASKING_BIT;
break;
}
}
if (ctx->Color.ColorLogicOpEnabled) rasterMask |= LOGIC_OP_BIT;
if (ctx->Texture._MaxEnabledTexImageUnit >= 0) rasterMask |= TEXTURE_BIT;
if ( ctx->ViewportArray[0].X < 0
|| ctx->ViewportArray[0].X + ctx->ViewportArray[0].Width > (GLfloat) ctx->DrawBuffer->Width
|| ctx->ViewportArray[0].Y < 0
|| ctx->ViewportArray[0].Y + ctx->ViewportArray[0].Height > (GLfloat) ctx->DrawBuffer->Height) {
rasterMask |= CLIP_BIT;
}
if (ctx->Query.CurrentOcclusionObject)
rasterMask |= OCCLUSION_BIT;
/* If we're not drawing to exactly one color buffer set the
* MULTI_DRAW_BIT flag. Also set it if we're drawing to no
* buffers or the RGBA or CI mask disables all writes.
*/
if (ctx->DrawBuffer->_NumColorDrawBuffers != 1) {
/* more than one color buffer designated for writing (or zero buffers) */
rasterMask |= MULTI_DRAW_BIT;
}
for (i = 0; i < ctx->Const.MaxDrawBuffers; i++) {
if (ctx->Color.ColorMask[i][0] +
ctx->Color.ColorMask[i][1] +
ctx->Color.ColorMask[i][2] +
ctx->Color.ColorMask[i][3] == 0) {
rasterMask |= MULTI_DRAW_BIT; /* all RGBA channels disabled */
break;
}
}
if (_swrast_use_fragment_program(ctx)) {
rasterMask |= FRAGPROG_BIT;
}
if (ctx->ATIFragmentShader._Enabled) {
rasterMask |= ATIFRAGSHADER_BIT;
}
#if CHAN_TYPE == GL_FLOAT
if (ctx->Color.ClampFragmentColor == GL_TRUE) {
rasterMask |= CLAMPING_BIT;
}
#endif
SWRAST_CONTEXT(ctx)->_RasterMask = rasterMask;
}