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1 | typedef union { |
2 | float f; | |
3 | int i; | |
4 | } fi_type; | |
5 | static __inline__ int IS_INF_OR_NAN(float x) | |
6 | { | |
7 | fi_type tmp; | |
8 | tmp.f = x; | |
9 | return !(int)((unsigned int)((tmp.i & 0x7fffffff) - 0x7f800000) >> 31); | |
10 | } | |
11 | ||
12 | typedef enum { | |
13 | FRAG_ATTRIB_WPOS = 0, FRAG_ATTRIB_COL0 = 1, FRAG_ATTRIB_COL1 = | |
14 | 2, FRAG_ATTRIB_FOGC = 3, FRAG_ATTRIB_TEX0 = 4, FRAG_ATTRIB_TEX1 = | |
15 | 5, FRAG_ATTRIB_TEX2 = 6, FRAG_ATTRIB_TEX3 = 7, FRAG_ATTRIB_TEX4 = | |
16 | 8, FRAG_ATTRIB_TEX5 = 9, FRAG_ATTRIB_TEX6 = 10, FRAG_ATTRIB_TEX7 = | |
17 | 11, FRAG_ATTRIB_FACE = 12, FRAG_ATTRIB_PNTC = 13, FRAG_ATTRIB_VAR0 = | |
18 | 14, FRAG_ATTRIB_MAX = (FRAG_ATTRIB_VAR0 + 16) | |
19 | } gl_frag_result; | |
20 | typedef enum { | |
21 | TEXTURE_BUFFER_INDEX, TEXTURE_2D_ARRAY_INDEX, TEXTURE_1D_ARRAY_INDEX, | |
22 | TEXTURE_CUBE_INDEX, TEXTURE_3D_INDEX, TEXTURE_RECT_INDEX, | |
23 | TEXTURE_2D_INDEX, TEXTURE_1D_INDEX, NUM_TEXTURE_TARGETS | |
24 | } gl_texture_index; | |
25 | struct gl_texture_image { | |
26 | unsigned int Width; | |
27 | unsigned int Height; | |
28 | unsigned int WidthLog2; | |
29 | void *Data; | |
30 | }; | |
31 | typedef enum { | |
32 | MAX_FACES = 6 | |
33 | } gl_face_index; | |
34 | struct gl_texture_object { | |
35 | int BaseLevel; | |
36 | struct gl_texture_image *Image[MAX_FACES][15]; | |
37 | }; | |
38 | struct gl_texture_unit { | |
39 | struct gl_texture_object *CurrentTex[NUM_TEXTURE_TARGETS]; | |
40 | }; | |
41 | struct gl_texture_attrib { | |
42 | struct gl_texture_unit Unit[(16 + 16)]; | |
43 | }; | |
44 | struct gl_renderbuffer { | |
45 | void (*PutRowRGB) (struct gl_context * ctx, struct gl_renderbuffer * rb, | |
46 | unsigned int count, int x, int y, | |
47 | const void *values); | |
48 | }; | |
49 | struct gl_framebuffer { | |
50 | struct gl_renderbuffer *_ColorDrawBuffers[8]; | |
51 | }; | |
52 | struct gl_context { | |
53 | struct gl_framebuffer *DrawBuffer; | |
54 | struct gl_texture_attrib Texture; | |
55 | }; | |
56 | typedef struct { | |
57 | float attrib[FRAG_ATTRIB_MAX][4]; | |
58 | } SWvertex; | |
59 | typedef struct sw_span { | |
60 | int x, y; | |
61 | unsigned int end; | |
62 | float attrStepX[FRAG_ATTRIB_MAX][4]; | |
63 | int intTex[2], intTexStep[2]; | |
64 | } SWspan; | |
65 | typedef void (*swrast_tri_func) (struct gl_context * ctx, const SWvertex *, | |
66 | const SWvertex *, const SWvertex *); | |
67 | typedef struct { | |
68 | swrast_tri_func Triangle; | |
69 | } SWcontext; | |
70 | static void simple_textured_triangle(struct gl_context *ctx, | |
71 | const SWvertex * v0, const SWvertex * v1, | |
72 | const SWvertex * v2) | |
73 | { | |
74 | typedef struct { | |
75 | float dx; | |
76 | float dy; | |
77 | int fsx; | |
78 | int fx0; | |
79 | int lines; | |
80 | } EdgeT; | |
81 | EdgeT eMaj; | |
82 | EdgeT eTop; | |
83 | EdgeT eBot; | |
84 | float oneOverArea; | |
85 | const SWvertex *vMin; | |
86 | const SWvertex *vMid; | |
87 | const SWvertex *vMax; | |
88 | const int snapMask = ~(((1 << 11) / (1 << 4)) - 1); | |
89 | int vMin_fx; | |
90 | int vMin_fy; | |
91 | int vMid_fx; | |
92 | int vMid_fy; | |
93 | int vMax_fx; | |
94 | int vMax_fy; | |
95 | SWspan span; | |
96 | const int fy0 = | |
97 | (((int) | |
98 | ((((v0->attrib[FRAG_ATTRIB_WPOS][1] - | |
99 | 0.5F) * ((float)(1 << 11))) >= | |
100 | 0.0F) ? (((v0->attrib[FRAG_ATTRIB_WPOS][1] - 0.5F) * | |
101 | ((float)(1 << 11))) + | |
102 | 0.5F) : (((v0->attrib[FRAG_ATTRIB_WPOS][1] - 0.5F) * | |
103 | ((float)(1 << 11))) - 0.5F)))) & snapMask; | |
104 | const int fy1 = | |
105 | (((int) | |
106 | ((((v1->attrib[FRAG_ATTRIB_WPOS][1] - | |
107 | 0.5F) * ((float)(1 << 11))) >= | |
108 | 0.0F) ? (((v1->attrib[FRAG_ATTRIB_WPOS][1] - 0.5F) * | |
109 | ((float)(1 << 11))) + | |
110 | 0.5F) : (((v1->attrib[FRAG_ATTRIB_WPOS][1] - 0.5F) * | |
111 | ((float)(1 << 11))) - 0.5F)))) & snapMask; | |
112 | const int fy2 = | |
113 | (((int) | |
114 | ((((v2->attrib[FRAG_ATTRIB_WPOS][1] - | |
115 | 0.5F) * ((float)(1 << 11))) >= | |
116 | 0.0F) ? (((v2->attrib[FRAG_ATTRIB_WPOS][1] - 0.5F) * | |
117 | ((float)(1 << 11))) + | |
118 | 0.5F) : (((v2->attrib[FRAG_ATTRIB_WPOS][1] - 0.5F) * | |
119 | ((float)(1 << 11))) - 0.5F)))) & snapMask; | |
120 | if (fy0 <= fy1) { | |
121 | if (fy1 <= fy2) { | |
122 | vMin = v0; | |
123 | vMax = v1; | |
124 | vMin_fy = fy0; | |
125 | } | |
126 | } | |
127 | vMin_fx = | |
128 | (((int) | |
129 | ((((vMin->attrib[FRAG_ATTRIB_WPOS][0] + | |
130 | 0.5F) * ((float)(1 << 11))) >= | |
131 | 0.0F) ? (((vMin->attrib[FRAG_ATTRIB_WPOS][0] + 0.5F) * | |
132 | ((float)(1 << 11))) + | |
133 | 0.5F) : (((vMin->attrib[FRAG_ATTRIB_WPOS][0] + 0.5F) * | |
134 | ((float)(1 << 11))) - 0.5F)))) & snapMask; | |
135 | vMid_fx = | |
136 | (((int) | |
137 | ((((vMid->attrib[FRAG_ATTRIB_WPOS][0] + | |
138 | 0.5F) * ((float)(1 << 11))) >= | |
139 | 0.0F) ? (((vMid->attrib[FRAG_ATTRIB_WPOS][0] + 0.5F) * | |
140 | ((float)(1 << 11))) + | |
141 | 0.5F) : (((vMid->attrib[FRAG_ATTRIB_WPOS][0] + 0.5F) * | |
142 | ((float)(1 << 11))) - 0.5F)))) & snapMask; | |
143 | eMaj.dx = ((vMax_fx - vMin_fx) * (1.0F / ((float)(1 << 11)))); | |
144 | eMaj.dy = ((vMax_fy - vMin_fy) * (1.0F / ((float)(1 << 11)))); | |
145 | eTop.dx = ((vMax_fx - vMid_fx) * (1.0F / ((float)(1 << 11)))); | |
146 | eBot.dy = ((vMid_fy - vMin_fy) * (1.0F / ((float)(1 << 11)))); | |
147 | const float area = eMaj.dx * eBot.dy - eBot.dx * eMaj.dy; | |
148 | if (IS_INF_OR_NAN(area) || area == 0.0F) | |
149 | return; | |
150 | oneOverArea = 1.0F / area; | |
151 | if (eBot.lines > 0) { | |
152 | eBot.fx0 = vMin_fx; | |
153 | } | |
154 | int scan_from_left_to_right; | |
155 | struct gl_renderbuffer *rb = ctx->DrawBuffer->_ColorDrawBuffers[0]; | |
156 | const struct gl_texture_object *obj = | |
157 | ctx->Texture.Unit[0].CurrentTex[TEXTURE_2D_INDEX]; | |
158 | const struct gl_texture_image *texImg = obj->Image[0][obj->BaseLevel]; | |
159 | const float twidth = (float)texImg->Width; | |
160 | const int twidth_log2 = texImg->WidthLog2; | |
161 | const unsigned char *texture = (const unsigned char *)texImg->Data; | |
162 | const int smask = texImg->Width - 1; | |
163 | const int tmask = texImg->Height - 1; | |
164 | if (!rb || !texture) { | |
165 | return; | |
166 | } | |
167 | float eMaj_ds = | |
168 | (vMax->attrib[FRAG_ATTRIB_TEX0][0] - | |
169 | vMin->attrib[FRAG_ATTRIB_TEX0][0]) * twidth; | |
170 | float eBot_ds = | |
171 | (vMid->attrib[FRAG_ATTRIB_TEX0][0] - | |
172 | vMin->attrib[FRAG_ATTRIB_TEX0][0]) * twidth; | |
173 | span.attrStepX[FRAG_ATTRIB_TEX0][0] = | |
174 | oneOverArea * (eMaj_ds * eBot.dy - eMaj.dy * eBot_ds); | |
175 | span.intTexStep[0] = | |
176 | (((int) | |
177 | ((((span.attrStepX[FRAG_ATTRIB_TEX0][0]) * ((float)(1 << 11))) >= | |
178 | 0.0F) ? (((span.attrStepX[FRAG_ATTRIB_TEX0][0]) * | |
179 | ((float)(1 << 11))) + | |
180 | 0.5F) : (((span.attrStepX[FRAG_ATTRIB_TEX0][0]) * | |
181 | ((float)(1 << 11))) - 0.5F)))); | |
182 | int subTriangle; | |
183 | int fxLeftEdge = 0; | |
184 | int fxRightEdge = 0; | |
185 | int sLeft = 0; | |
186 | for (subTriangle = 0; subTriangle <= 1; subTriangle++) { | |
187 | EdgeT *eRight; | |
188 | int lines; | |
189 | if (subTriangle == 0) { | |
190 | if (scan_from_left_to_right) { | |
191 | eRight = &eBot; | |
192 | lines = eRight->lines; | |
193 | } else { | |
194 | eRight = &eMaj; | |
195 | } | |
196 | } else { | |
197 | if (scan_from_left_to_right) { | |
198 | eRight = &eTop; | |
199 | } | |
200 | fxRightEdge = eRight->fsx - 1; | |
201 | } | |
202 | while (lines > 0) { | |
203 | const int right = fxRightEdge >> 11; | |
204 | span.x = fxLeftEdge >> 11; | |
205 | if (right <= span.x) | |
206 | span.end = 0; | |
207 | else | |
208 | span.end = right - span.x; | |
209 | span.intTex[0] = sLeft; | |
210 | if (span.end > 0 && span.y >= 0) { | |
211 | unsigned int i; | |
212 | unsigned char rgb[16384][3]; | |
213 | for (i = 0; i < span.end; i++) { | |
214 | int s = | |
215 | ((span.intTex[0]) >> 11) & smask; | |
216 | int t = | |
217 | ((span.intTex[1]) >> 11) & tmask; | |
218 | int pos = (t << twidth_log2) + s; | |
219 | rgb[i][0] = texture[pos + 2]; | |
220 | span.intTex[0] += span.intTexStep[0]; | |
221 | } | |
222 | rb->PutRowRGB(ctx, rb, span.end, span.x, span.y, | |
223 | rgb); | |
224 | } | |
225 | } | |
226 | } | |
227 | } | |
228 | ||
229 | void _swrast_choose_triangle(struct gl_context *ctx) | |
230 | { | |
231 | SWcontext *swrast = SWRAST_CONTEXT(ctx); | |
232 | swrast->Triangle = simple_textured_triangle; | |
233 | } |