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https://github.com/mauiaaron/apple2.git
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Refactor dhires graphics plotting to C
This commit is contained in:
Aaron Culliney
parent
46b6fa5342
commit
3d45e75ea1
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@ -29,7 +29,7 @@ noinst_PROGRAMS = genfont
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bin_PROGRAMS = apple2ix
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ASM_SRC = \
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src/asm386/glue.S src/asm386/cpu.S src/asm386/display.S
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src/asm386/glue.S src/asm386/cpu.S
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INTERFACE_CLASSIC_SRC = \
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src/interface.c
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@ -76,7 +76,7 @@ dnl at this point we believe arch/os is good ...
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ARCHOS_HACK_LDFLAGS="-L/usr/lib/i386-linux-gnu -L/lib/i386-linux-gnu"
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AC_SUBST(ARCHOS_HACK_LDFLAGS)
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ASM_O="src/asm386/glue.o src/asm386/cpu.o src/asm386/display.o"
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ASM_O="src/asm386/glue.o src/asm386/cpu.o"
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AC_SUBST(ASM_O)
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@ -1,159 +0,0 @@
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/*
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* Apple // emulator for Linux:
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* Functions for low-level framebuffer output.
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*
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* Copyright 1994 Alexander Jean-Claude Bottema
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* Copyright 1995 Stephen Lee
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* Copyright 1997, 1998 Aaron Culliney
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* Copyright 1998, 1999, 2000 Michael Deutschmann
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*
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* This software package is subject to the GNU General Public License
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* version 2 or later (your choice) as published by the Free Software
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* Foundation.
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*
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* THERE ARE NO WARRANTIES WHATSOEVER.
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*
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*/
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#define __ASSEMBLY__
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#include "apple2.h"
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#include "video/video.h"
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#include "cpu.h"
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#include "misc.h"
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/* -------------------------------------------------------------------------
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* Plots a normalized byte of dhires color directly into graphics memory.
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* eax: graphics memory index
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* ebx: dhires_colors index
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* edx: scratch
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* ------------------------------------------------------------------------- */
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#if 1
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#define PlotDHiresByte\
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xorl %edx, %edx;\
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movb SN(video__dhires2)(,%ebx,1), %dl;\
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/*movb %dl, %dh;*/\
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shll $16, %edx;\
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movb SN(video__dhires1)(,%ebx,1), %dl;\
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/*movb %dl, %dh;*/\
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movl %edx, (%eax);\
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movl %edx, SCANWIDTH(%eax);
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#else
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#define PlotDHiresByte\
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pushal;\
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pushl %eax;\
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pushl %ebx;\
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call _plot_dhires_pixels;\
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popl %ebx;\
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popl %eax;\
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popal;
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#endif
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/* -------------------------------------------------------------------------
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* Plot a full double hires color byte into GM
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* OFF 0x2000, 0x4000
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* PROBLEMS:
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* graphics artifiacts are not implemented correctly.
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* ------------------------------------------------------------------------- */
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#define PlotDHires(OFF,X,GM) \
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pushl %eax; /* save regs */ \
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pushl %ebx; \
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pushl %ecx; \
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pushl %edx; \
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pushl EffectiveAddr_E; \
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\
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andl $0xFFFF, EffectiveAddr_E; /* erase offset */ \
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btr $0, EffectiveAddr_E; /* normalize */ \
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movl EffectiveAddr_E, %ecx; /* ecx = mem addrs */ \
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subw OFF, EffectiveAddr; /* - graphics base */ \
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movl SN(video__screen_addresses) \
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(,EffectiveAddr_E,4), %eax; /* eax = GM offset */ \
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movb SN(video__columns) \
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(,EffectiveAddr_E,1), %bl; \
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addl SN(GM), %eax; /* eax += GM base */ \
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\
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leal SN(apple_ii_64k), EffectiveAddr_E;\
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addl %ecx, EffectiveAddr_E; \
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movl EffectiveAddr_E, %ecx; \
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addl $0x10000, %ecx; \
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\
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testb $0xFF, %bl; \
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jz plot_dhires##X##_cont; \
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movzbl -1(EffectiveAddr_E), %ebx; \
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movb 0(%ecx), %bh; \
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btr $7, %ebx; \
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shrb $3, %bl; \
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shlb $4, %bh; \
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orb %bh, %bl; \
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movzbl %bl, %ebx; \
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subl $4, %eax;\
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PlotDHiresByte\
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addl $4, %eax;\
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\
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plot_dhires##X##_cont: \
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movl %ecx, %edx; \
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movb 2(%edx), %cl; \
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shll $28, %ecx; \
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\
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movzbl 1(EffectiveAddr_E), %ebx; \
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btr $7, %ebx; /* erase msb */ \
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shll $21, %ebx; \
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orl %ebx, %ecx; \
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\
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movzbl 1(%edx), %ebx; \
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btr $7, %ebx; /* erase msb */ \
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shll $14, %ebx; \
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orl %ebx, %ecx; \
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\
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movzbl 0(EffectiveAddr_E), %ebx; \
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btr $7, %ebx; /* erase msb */ \
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shll $7, %ebx; \
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orl %ebx, %ecx; \
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\
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movzbl 0(%edx), %ebx; \
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btr $7, %ebx; /* erase msb */ \
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orl %ebx, %ecx; \
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/* 00000001 11111122 22222333 3333xxxx */ \
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\
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PlotDHiresByte \
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addl $4, %eax;\
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shrl $4, %ecx; \
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movb %cl, %bl; \
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PlotDHiresByte \
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addl $4, %eax;\
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shrl $4, %ecx; \
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movb %cl, %bl; \
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PlotDHiresByte \
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addl $4, %eax;\
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shrl $4, %ecx; \
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movb %cl, %bl; \
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PlotDHiresByte \
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addl $4, %eax;\
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shrl $4, %ecx; \
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movb %cl, %bl; \
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PlotDHiresByte \
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addl $4, %eax;\
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shrl $4, %ecx; \
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movb %cl, %bl; \
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PlotDHiresByte \
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addl $4, %eax;\
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shrl $4, %ecx; \
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movb %cl, %bl; \
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PlotDHiresByte \
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popl EffectiveAddr_E; \
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andl $0xFFFF, EffectiveAddr_E;/* for safety */ \
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popl %edx; \
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popl %ecx; /* restore regs */ \
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popl %ebx; \
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popl %eax; \
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ret;
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/******************************************/
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E(iie_plot_dhires0)
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PlotDHires($0x2000,0,video__fb1)
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ret
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E(iie_plot_dhires1)
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PlotDHires($0x4000,1,video__fb2)
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ret
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105
src/display.c
105
src/display.c
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@ -661,7 +661,97 @@ GLUE_C_WRITE(video__write_2e_text1_mixed)
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}
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// ----------------------------------------------------------------------------
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// Hires (and Double-Hires) GRaphics
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// Double-Hires GRaphics
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// PlotDHiresByte
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static inline void _plot_dhires_pixels(uint8_t idx, uint8_t *fb_ptr) {
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uint8_t b1 = video__dhires1[idx];
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uint8_t b2 = video__dhires2[idx];
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uint32_t b = (b2<<24) | (b1<<8);
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*((uint32_t *)fb_ptr) = b;
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*((uint32_t *)(fb_ptr+SCANWIDTH)) = b;
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}
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// PlotDHires
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static inline void _plot_dhires(uint16_t base, uint16_t ea, uint8_t *fb_base) {
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ea &= ~0x1;
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uint16_t memoff = ea - base;
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uint8_t *fb_ptr = fb_base+video__screen_addresses[memoff];
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uint8_t col = video__columns[memoff];
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uint8_t b0 = 0x0;
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uint8_t b1 = 0x0;
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uint32_t b = 0x0;
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if (col) {
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b0 = apple_ii_64k[0][ea-1];
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b1 = apple_ii_64k[1][ea];
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b0 &= ~0x80;
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b0 = (b1<<4)|(b0>>3);
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_plot_dhires_pixels(b0, fb_ptr-4);
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}
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b1 = apple_ii_64k[1][ea+2];
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b = (b1<<28);
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b0 = apple_ii_64k[0][ea+1];
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b0 &= ~0x80;
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b |= (b0<<21);
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b1 = apple_ii_64k[1][ea+1];
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b1 &= ~0x80;
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b |= (b1<<14);
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b0 = apple_ii_64k[0][ea];
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b0 &= ~0x80;
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b |= (b0<<7);
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b1 = apple_ii_64k[1][ea];
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b1 &= ~0x80;
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b |= b1;
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// 00000001 11111122 22222333 3333xxxx
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_plot_dhires_pixels(b, fb_ptr);
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b >>= 4;
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fb_ptr += 4;
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_plot_dhires_pixels(b, fb_ptr);
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b >>= 4;
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fb_ptr += 4;
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_plot_dhires_pixels(b, fb_ptr);
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b >>= 4;
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fb_ptr += 4;
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_plot_dhires_pixels(b, fb_ptr);
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b >>= 4;
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fb_ptr += 4;
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_plot_dhires_pixels(b, fb_ptr);
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b >>= 4;
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fb_ptr += 4;
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_plot_dhires_pixels(b, fb_ptr);
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b >>= 4;
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fb_ptr += 4;
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_plot_dhires_pixels(b, fb_ptr);
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}
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static inline void iie_plot_dhires0(uint16_t ea) {
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_plot_dhires(0x2000, ea, video__fb1);
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}
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static inline void iie_plot_dhires1(uint16_t ea) {
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_plot_dhires(0x4000, ea, video__fb2);
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}
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// ----------------------------------------------------------------------------
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// Hires GRaphics
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// CalculateInterpColor
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static inline void _calculate_interp_color(uint8_t *color_buf, const unsigned int idx, const uint8_t *interp_base, const uint16_t ea) {
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@ -691,14 +781,14 @@ static inline void _calculate_interp_color(uint8_t *color_buf, const unsigned in
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}
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// PlotPixelsExtra
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static inline void _plot_pixels(uint8_t *dst, const uint8_t *src) {
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static inline void _plot_hires_pixels(uint8_t *dst, const uint8_t *src) {
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uint8_t pix;
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for (unsigned int i=2; i; i--) {
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for (unsigned int j=DYNAMIC_SZ-1; j; j--) {
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uint16_t pix = *src;
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pix = ((pix<<8) | pix);
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*((uint16_t *)dst) = pix;
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*((uint16_t *)dst) = pix;
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++src;
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dst+=2;
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}
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@ -779,7 +869,7 @@ static inline void _plot_hires(uint16_t ea, uint8_t b, bool is_even, uint8_t *fb
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}
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}
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_plot_pixels(fb_ptr-4, color_buf);
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_plot_hires_pixels(fb_ptr-4, color_buf);
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}
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// DRAW_GRAPHICS
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@ -792,11 +882,9 @@ static inline void _draw_hires_graphics(uint16_t ea, uint8_t b, bool is_even, ui
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}
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if ((softswitches & SS_80COL) && (softswitches & SS_DHIRES)) {
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if (page) {
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extern void iie_plot_dhires1();
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iie_plot_dhires1();
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iie_plot_dhires1(ea);
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} else {
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extern void iie_plot_dhires0();
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iie_plot_dhires0();
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iie_plot_dhires0(ea);
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}
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return;
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}
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@ -912,3 +1000,4 @@ void video_redraw(void) {
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softswitches = softswitches_save;
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}
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