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annotate src/hermes/mmx_main.asm @ 1257:448a9a64537b

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[PATCH] SDL_GetVideoMode() does not find best mode, part 2 Following commit 1.51, I come accross a problem when SDL must choose between several video modes that could suit the one asked. If I ask 320x240 with this list: 768x480 768x240 640x400 640x200 384x480 384x240 320x400 320x200 The smallest selectables modes are 384x240 and 320x400. And SDL choose the later in this list, but 384x240 is more suitable. So I added a check to compare the pixel count (surface) of modes, and select the one which has the smallest pixel count. In my example, 384x240 has 92160 pixels, and 320x400 has 128000 pixels. So now SDL will choose 384x240 for the asked 320x240 mode.
author Patrice Mandin <patmandin@gmail.com>
date Thu, 19 Jan 2006 21:28:52 +0000
parents 2d6dc7de1145
children 393092a3ebf6
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1 ;
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2 ; mmx format converter main loops for HERMES
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3 ; Some routines Copyright (c) 1998 Christian Nentwich (c.nentwich@cs.ucl.ac.uk)
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4 ; This source code is licensed under the GNU LGPL
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5 ;
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6 ; Please refer to the file COPYING.LIB contained in the distribution for
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7 ; licensing conditions
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8 ;
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9
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10 BITS 32
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11
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12 GLOBAL _ConvertMMX
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13 GLOBAL _mmxreturn
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14
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15 SECTION .text
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16
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17 ;; _ConvertMMX:
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18 ;; [ESP+8] ConverterInfo*
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19 ;; --------------------------------------------------------------------------
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20 ;; ConverterInfo (ebp+..)
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21 ;; 0: void *s_pixels
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22 ;; 4: int s_width
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23 ;; 8: int s_height
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24 ;; 12: int s_add
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25 ;; 16: void *d_pixels
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26 ;; 20: int d_width
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27 ;; 24: int d_height
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28 ;; 28: int d_add
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29 ;; 32: void (*converter_function)()
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30 ;; 36: int32 *lookup
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31
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32 _ConvertMMX:
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33 push ebp
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34 mov ebp,esp
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35
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36 ; Save the registers used by the blitters, necessary for optimized code
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37 pusha
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38
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39 mov eax,[ebp+8]
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40
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41 cmp dword [eax+4],BYTE 0
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42 je endconvert
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43
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44 mov ebp,eax
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45
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46 mov esi,[ebp+0]
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47 mov edi,[ebp+16]
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48
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49 y_loop:
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50 mov ecx,[ebp+4]
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51
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52 jmp [ebp+32]
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53
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54 _mmxreturn:
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55 add esi,[ebp+12]
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56 add edi,[ebp+28]
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57
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58 dec dword [ebp+8]
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59 jnz y_loop
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60
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61
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62 ; Restore the registers used by the blitters, necessary for optimized code
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63 popa
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64
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65 pop ebp
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66
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67 endconvert:
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68 emms
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69
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70 ret
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71
1199
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72 %ifidn __OUTPUT_FORMAT__,elf
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73 section .note.GNU-stack noalloc noexec nowrite progbits
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74 %endif