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Rev | Author | Line No. | Line |
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5153 | IgorA | 1 | ; simple gl like driver for TinyGL and KolibriOS - porting iadn |
2 | |||
3 | |||
4 | struct TinyGLContext |
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5 | gl_context dd ? |
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6 | xsize dd ? ;+4 |
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7 | ysize dd ? ;+8 |
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8 | d_x dd ? ;+12 |
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9 | d_y dd ? ;+16 |
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10 | x dd ? ;+20 |
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11 | y dd ? ;+24 |
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12 | ends |
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13 | |||
14 | ;KOSGLContext kosglCreateContext(KOSGLContext shareList, int flags) |
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15 | ;{ |
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16 | ; TinyGLContext *ctx; |
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17 | ; |
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18 | ; if (shareList != NULL) { |
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19 | ; gl_fatal_error("No sharing available in TinyGL"); |
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20 | ; } |
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21 | ; |
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22 | ; ctx=gl_malloc(sizeof(TinyGLContext)); |
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23 | ; if (!ctx) |
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24 | ; return NULL; |
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25 | ; ctx->gl_context=NULL; |
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26 | ; return (KOSGLContext) ctx; |
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27 | ;} |
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28 | |||
29 | ;void kosglDestroyContext( KOSGLContext ctx1 ) |
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30 | ;{ |
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31 | ; TinyGLContext *ctx = (TinyGLContext *) ctx1; |
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32 | ; if (ctx->gl_context != NULL) { |
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33 | ; glClose(); |
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34 | ; } |
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35 | ; gl_free(ctx); |
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36 | ;} |
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37 | |||
38 | ; resize the glx viewport : we try to use the xsize and ysize |
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39 | ; given. We return the effective size which is guaranted to be smaller |
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40 | |||
41 | align 4 |
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42 | proc gl_resize_viewport uses ebx ecx edx edi esi, context:dword, xsize_ptr:dword, ysize_ptr:dword |
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43 | xor eax,eax |
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44 | |||
45 | mov ecx,[xsize_ptr] ; ecx = &xsize |
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46 | mov edi,[ecx] ; edi = xsize |
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47 | mov esi,[ysize_ptr] ; esi = &ysize |
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48 | mov esi,[esi] ; esi = ysize |
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49 | |||
50 | ; we ensure that xsize and ysize are multiples of 2 for the zbuffer. |
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51 | ; TODO: find a better solution |
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52 | and edi, not 3 |
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53 | and esi, not 3 |
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54 | |||
55 | cmp edi,0 |
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56 | jne @f |
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57 | cmp esi,0 |
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58 | jne @f |
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59 | mov eax,-1 |
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60 | jmp .end_f |
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61 | @@: |
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62 | |||
63 | mov [ecx],edi |
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64 | dec dword[ecx] |
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65 | mov ecx,[ysize_ptr] |
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66 | mov [ecx],esi |
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67 | dec dword[ecx] |
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68 | |||
69 | mov ebx,[context] |
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70 | mov edx,[ebx+offs_cont_opaque] ; edx = (TinyGLContext *)context.opaque |
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71 | mov [edx+4],edi |
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72 | mov [edx+12],edi ;d_x = xsize |
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73 | mov [edx+8],esi |
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74 | mov [edx+16],esi ;d_y = ysize |
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75 | |||
76 | ; resize the Z buffer |
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77 | stdcall ZB_resize, dword[ebx+offs_cont_zb],0,edi,esi |
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78 | .end_f: |
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79 | ret |
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80 | endp |
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81 | |||
82 | ; we assume here that drawable is a window |
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83 | align 4 |
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84 | proc kosglMakeCurrent uses ebx ecx, win_x0:dword, win_y0:dword, win_x:dword, win_y:dword, ctx1:dword |
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85 | mov ebx,[ctx1] |
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86 | cmp dword[ebx],0 ;if (ctx.gl_context == NULL) |
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87 | jne .end_f |
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88 | ; create the TinyGL context |
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89 | mov ecx,[win_x0] |
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90 | mov [ebx+20],ecx ;ctx.x = win_x0 |
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91 | mov ecx,[win_y0] |
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92 | mov [ebx+24],ecx ;ctx.y = win_y0 |
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93 | mov ecx,[win_x] |
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94 | mov [ebx+12],ecx ;ctx.d_x = win_x |
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95 | mov ecx,[win_y] |
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96 | mov [ebx+16],ecx ;ctx.d_y = win_y |
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97 | |||
98 | ; currently, we only support 16 bit rendering |
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99 | xor eax,eax |
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100 | stdcall ZB_open, dword[win_x], dword[win_y], dword ZB_MODE_RGB24, eax,eax,eax,eax ;NULL,NULL,NULL |
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101 | |||
102 | cmp eax,0 |
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103 | jne @f |
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104 | stdcall dbg_print,f_kosgl_1,err_0 |
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105 | xor eax,eax |
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106 | jmp .err_f |
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107 | @@: |
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108 | |||
109 | ; initialisation of the TinyGL interpreter |
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110 | stdcall glInit, eax |
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111 | |||
112 | call gl_get_context |
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113 | mov [ebx],eax ;ctx.gl_context = eax |
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114 | |||
115 | mov [eax+offs_cont_opaque],ebx ;ctx.gl_context.opaque = ctx |
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116 | mov dword[eax+offs_cont_gl_resize_viewport],gl_resize_viewport |
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117 | |||
118 | ; set the viewport : we force a call to gl_resize_viewport |
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119 | dec dword[eax+offs_cont_viewport+offs_vpor_xsize] |
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120 | dec dword[eax+offs_cont_viewport+offs_vpor_ysize] |
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121 | |||
122 | stdcall glViewport, 0, 0, [win_x], [win_y] |
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123 | .end_f: |
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124 | xor eax,eax |
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125 | inc eax |
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126 | .err_f: |
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127 | ret |
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128 | endp |
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129 | |||
130 | align 4 |
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131 | proc kosglSwapBuffers uses eax ebx ecx edx esi |
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132 | ; retrieve the current TinyGLContext |
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133 | call gl_get_context |
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134 | mov ebx,[eax+offs_cont_zb] |
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135 | mov ebx,[ebx+offs_zbuf_pbuf] |
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136 | mov esi,[eax+offs_cont_opaque] ;esi = &context.opaque |
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137 | mov eax,7 |
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138 | mov ecx,[esi+12] ;d_x |
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139 | shl ecx,16 |
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140 | mov cx,[esi+16] ;d_y |
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141 | mov edx,[esi+20] ;x |
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142 | shl edx,16 |
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143 | mov dx,[esi+24] ;y |
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144 | int 0x40 |
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145 | ret |
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146 | endp |