mirror of
https://github.com/reactos/reactos.git
synced 2024-08-20 02:13:29 +00:00
115 lines
2.5 KiB
C
115 lines
2.5 KiB
C
/*
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* Written by José Fonseca <j_r_fonseca@yahoo.co.uk>
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*/
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/*
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* void _mesa_mmx_blend( struct gl_context *ctx,
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* GLuint n,
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* const GLubyte mask[],
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* GLchan rgba[][4],
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* CONST GLchan dest[][4] )
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*
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*/
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ALIGNTEXT16
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GLOBL GLNAME( TAG(_mesa_mmx_blend) )
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HIDDEN( TAG(_mesa_mmx_blend) )
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GLNAME( TAG(_mesa_mmx_blend) ):
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PUSH_L ( EBP )
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MOV_L ( ESP, EBP )
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PUSH_L ( ESI )
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PUSH_L ( EDI )
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PUSH_L ( EBX )
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MOV_L ( REGOFF(12, EBP), ECX ) /* n */
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CMP_L ( CONST(0), ECX)
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JE ( LLTAG(GMB_return) )
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MOV_L ( REGOFF(16, EBP), EBX ) /* mask */
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MOV_L ( REGOFF(20, EBP), EDI ) /* rgba */
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MOV_L ( REGOFF(24, EBP), ESI ) /* dest */
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INIT
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TEST_L ( CONST(4), EDI ) /* align rgba on an 8-byte boundary */
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JZ ( LLTAG(GMB_align_end) )
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CMP_B ( CONST(0), REGIND(EBX) ) /* *mask == 0 */
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JE ( LLTAG(GMB_align_continue) )
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/* runin */
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#define ONE(x) x
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#define TWO(x)
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MAIN ( EDI, ESI )
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#undef ONE
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#undef TWO
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LLTAG(GMB_align_continue):
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DEC_L ( ECX ) /* n -= 1 */
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INC_L ( EBX ) /* mask += 1 */
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ADD_L ( CONST(4), EDI ) /* rgba += 1 */
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ADD_L ( CONST(4), ESI ) /* dest += 1 */
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LLTAG(GMB_align_end):
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CMP_L ( CONST(2), ECX)
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JB ( LLTAG(GMB_loop_end) )
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ALIGNTEXT16
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LLTAG(GMB_loop_begin):
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CMP_W ( CONST(0), REGIND(EBX) ) /* *mask == 0 && *(mask + 1) == 0 */
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JE ( LLTAG(GMB_loop_continue) )
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/* main loop */
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#define ONE(x)
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#define TWO(x) x
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MAIN ( EDI, ESI )
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#undef ONE
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#undef TWO
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LLTAG(GMB_loop_continue):
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DEC_L ( ECX )
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DEC_L ( ECX ) /* n -= 2 */
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ADD_L ( CONST(2), EBX ) /* mask += 2 */
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ADD_L ( CONST(8), EDI ) /* rgba += 2 */
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ADD_L ( CONST(8), ESI ) /* dest += 2 */
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CMP_L ( CONST(2), ECX )
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JAE ( LLTAG(GMB_loop_begin) )
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LLTAG(GMB_loop_end):
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CMP_L ( CONST(1), ECX )
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JB ( LLTAG(GMB_done) )
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CMP_B ( CONST(0), REGIND(EBX) ) /* *mask == 0 */
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JE ( LLTAG(GMB_done) )
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/* runout */
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#define ONE(x) x
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#define TWO(x)
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MAIN ( EDI, ESI )
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#undef ONE
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#undef TWO
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LLTAG(GMB_done):
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EMMS
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LLTAG(GMB_return):
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POP_L ( EBX )
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POP_L ( EDI )
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POP_L ( ESI )
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MOV_L ( EBP, ESP )
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POP_L ( EBP )
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RET
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#undef TAG
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#undef LLTAG
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#undef INIT
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#undef MAIN
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