diff options
Diffstat (limited to 'src/gallium/drivers/r300/r300_fs.c')
| -rw-r--r-- | src/gallium/drivers/r300/r300_fs.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/src/gallium/drivers/r300/r300_fs.c b/src/gallium/drivers/r300/r300_fs.c index 4e1b61ca409..60ea9c171d5 100644 --- a/src/gallium/drivers/r300/r300_fs.c +++ b/src/gallium/drivers/r300/r300_fs.c @@ -63,6 +63,11 @@ void r300_shader_read_fs_inputs(struct tgsi_shader_info* info, fs_inputs->fog = i; break; + case TGSI_SEMANTIC_POSITION: + assert(index == 0); + fs_inputs->wpos = i; + break; + default: assert(0); } @@ -114,6 +119,9 @@ static void allocate_hardware_inputs( if (inputs->fog != ATTR_UNUSED) { allocate(mydata, inputs->fog, reg++); } + if (inputs->wpos != ATTR_UNUSED) { + allocate(mydata, inputs->wpos, reg++); + } } static void get_compare_state( @@ -144,6 +152,7 @@ static void r300_translate_fragment_shader( struct r300_fragment_shader* fs = r300->fs; struct r300_fragment_program_compiler compiler; struct tgsi_to_rc ttr; + int wpos = fs->inputs.wpos; /* Setup the compiler. */ memset(&compiler, 0, sizeof(compiler)); @@ -171,6 +180,18 @@ static void r300_translate_fragment_shader( fs->shadow_samplers = compiler.Base.Program.ShadowSamplers; + /** + * Transform the program to support WPOS. + * + * Introduce a small fragment at the start of the program that will be + * the only code that directly reads the WPOS input. + * All other code pieces that reference that input will be rewritten + * to read from a newly allocated temporary. */ + if (wpos != ATTR_UNUSED) { + /* Moving the input to some other reg is not really necessary. */ + rc_transform_fragment_wpos(&compiler.Base, wpos, wpos, TRUE); + } + /* Invoke the compiler */ r3xx_compile_fragment_program(&compiler); if (compiler.Base.Error) { |