1 typedef unsigned int GLenum;
2 typedef unsigned char GLboolean;
3 typedef int GLint;
4 typedef unsigned short GLushort;
5 typedef unsigned int GLuint;
6 typedef float GLfloat;
7 typedef GLushort GLchan;
8 struct gl_texture_image;
9 typedef struct __GLcontextRec GLcontext;
10 typedef void (*FetchTexelFuncC) (const struct gl_texture_image * texImage,
11 GLint col, GLint row, GLint img,
12 GLchan * texelOut);
13 struct gl_texture_format
14 {
15 };
16 struct gl_texture_image
17 {
18 GLenum _BaseFormat;
19 GLboolean _IsPowerOfTwo;
20 FetchTexelFuncC FetchTexelc;
21 };
22 struct gl_texture_object
23 {
24 GLenum Target;
25 GLenum WrapS;
26 GLenum MinFilter;
27 GLenum MagFilter;
28 GLint BaseLevel;
29 GLint _MaxLevel;
30 struct gl_texture_image *Image[6][12];
31 };
32 enum _format
33 {
34 MESA_FORMAT_RGBA_DXT3, MESA_FORMAT_RGBA_DXT5, MESA_FORMAT_RGBA,
35 MESA_FORMAT_RGB, MESA_FORMAT_ALPHA, MESA_FORMAT_LUMINANCE,
36 };
37 typedef void (*texture_sample_func) (GLcontext * ctx,
38 const struct gl_texture_object * tObj,
39 GLuint n, const GLfloat texcoords[][4],
40 const GLfloat lambda[],
41 GLchan rgba[][4]);
lerp_2d(GLfloat a,GLfloat b,GLfloat v00,GLfloat v10,GLfloat v01,GLfloat v11)42 lerp_2d (GLfloat a, GLfloat b, GLfloat v00, GLfloat v10, GLfloat v01,
43 GLfloat v11)
44 {
45 const GLfloat temp0 = ((v00) + (a) * ((v10) - (v00)));
46 const GLfloat temp1 = ((v01) + (a) * ((v11) - (v01)));
47 return ((temp0) + (b) * ((temp1) - (temp0)));
48 }
49 static __inline__ void
lerp_rgba(GLchan result[4],GLfloat t,const GLchan a[4],const GLchan b[4])50 lerp_rgba (GLchan result[4], GLfloat t, const GLchan a[4], const GLchan b[4])
51 {
52 result[0] = (GLchan) (((a[0]) + (t) * ((b[0]) - (a[0]))) + 0.5);
53 result[1] = (GLchan) (((a[1]) + (t) * ((b[1]) - (a[1]))) + 0.5);
54 result[2] = (GLchan) (((a[2]) + (t) * ((b[2]) - (a[2]))) + 0.5);
55 }
56 static __inline__ void
lerp_rgba_2d(GLchan result[4],GLfloat a,GLfloat b,const GLchan t00[4],const GLchan t10[4],const GLchan t01[4],const GLchan t11[4])57 lerp_rgba_2d (GLchan result[4], GLfloat a, GLfloat b, const GLchan t00[4],
58 const GLchan t10[4], const GLchan t01[4], const GLchan t11[4])
59 {
60 result[0] = (GLchan) (lerp_2d (a, b, t00[0], t10[0], t01[0], t11[0]) + 0.5);
61 result[1] = (GLchan) (lerp_2d (a, b, t00[1], t10[1], t01[1], t11[1]) + 0.5);
62 result[2] = (GLchan) (lerp_2d (a, b, t00[2], t10[2], t01[2], t11[2]) + 0.5);
63 }
64 static __inline__ void
sample_2d_linear_repeat(GLcontext * ctx,const struct gl_texture_object * tObj,const struct gl_texture_image * img,const GLfloat texcoord[4],GLchan rgba[])65 sample_2d_linear_repeat (GLcontext * ctx,
66 const struct gl_texture_object *tObj,
67 const struct gl_texture_image *img,
68 const GLfloat texcoord[4], GLchan rgba[])
69 {
70 GLint i0, j0, i1, j1;
71 GLfloat a, b;
72 GLchan t00[4], t10[4], t01[4], t11[4];
73 {
74 };
75 img->FetchTexelc (img, i1, j1, 0, t11);
76 lerp_rgba_2d (rgba, a, b, t00, t10, t01, t11);
77 }
sample_2d_nearest_mipmap_linear(GLcontext * ctx,const struct gl_texture_object * tObj,GLuint n,const GLfloat texcoord[][4],const GLfloat lambda[],GLchan rgba[][4])78 sample_2d_nearest_mipmap_linear (GLcontext * ctx,
79 const struct gl_texture_object *tObj,
80 GLuint n, const GLfloat texcoord[][4],
81 const GLfloat lambda[], GLchan rgba[][4])
82 {
83 GLuint i;
84 GLint level = linear_mipmap_level (tObj, lambda[i]);
85 sample_2d_nearest (ctx, tObj, tObj->Image[0][tObj->_MaxLevel], texcoord[i], rgba[i]);
86 GLchan t0[4], t1[4];
87 sample_2d_nearest (ctx, tObj, tObj->Image[0][level], texcoord[i], t0);
88 sample_2d_nearest (ctx, tObj, tObj->Image[0][level + 1], texcoord[i], t1);
89 }
90 static void
sample_2d_linear_mipmap_linear_repeat(GLcontext * ctx,const struct gl_texture_object * tObj,GLuint n,const GLfloat texcoord[][4],const GLfloat lambda[],GLchan rgba[][4])91 sample_2d_linear_mipmap_linear_repeat (GLcontext * ctx,
92 const struct gl_texture_object *tObj,
93 GLuint n, const GLfloat texcoord[][4],
94 const GLfloat lambda[],
95 GLchan rgba[][4])
96 {
97 GLuint i;
98 for (i = 0; i < n; i++)
99 {
100 GLint level = linear_mipmap_level (tObj, lambda[i]);
101 if (level >= tObj->_MaxLevel)
102 {
103 GLchan t0[4], t1[4];
104 const GLfloat f = ((lambda[i]) - ifloor (lambda[i]));
105 sample_2d_linear_repeat (ctx, tObj, tObj->Image[0][level],
106 texcoord[i], t0);
107 sample_2d_linear_repeat (ctx, tObj, tObj->Image[0][level + 1],
108 texcoord[i], t1);
109 lerp_rgba (rgba[i], f, t0, t1);
110 }
111 }
112 }
113 static void
sample_lambda_2d(GLcontext * ctx,const struct gl_texture_object * tObj,GLuint n,const GLfloat texcoords[][4],const GLfloat lambda[],GLchan rgba[][4])114 sample_lambda_2d (GLcontext * ctx, const struct gl_texture_object *tObj,
115 GLuint n, const GLfloat texcoords[][4],
116 const GLfloat lambda[], GLchan rgba[][4])
117 {
118 const struct gl_texture_image *tImg = tObj->Image[0][tObj->BaseLevel];
119 GLuint minStart, minEnd;
120 GLuint magStart, magEnd;
121 const GLboolean repeatNoBorderPOT = (tObj->WrapS == 0x2901)
122 && (tImg->_BaseFormat != 0x1900) && tImg->_IsPowerOfTwo;
123 compute_min_mag_ranges (tObj, n, lambda, &minStart, &minEnd, &magStart,
124 &magEnd);
125 if (minStart < minEnd)
126 {
127 const GLuint m = minEnd - minStart;
128 switch (tObj->MinFilter)
129 {
130 case 0x2600:
131 if (repeatNoBorderPOT)
132 {
133 case MESA_FORMAT_RGB:
134 opt_sample_rgb_2d (ctx, tObj, m, texcoords + minStart,
135 ((void *) 0), rgba + minStart);
136 case MESA_FORMAT_RGBA:
137 opt_sample_rgba_2d (ctx, tObj, m, texcoords + minStart,
138 ((void *) 0), rgba + minStart);
139 }
140 {
141 sample_nearest_2d (ctx, tObj, m, texcoords + minStart,
142 ((void *) 0), rgba + minStart);
143 }
144 break;
145 sample_2d_nearest_mipmap_linear (ctx, tObj, m, texcoords + minStart,
146 lambda + minStart,
147 rgba + minStart);
148 case 0x2703:
149 if (repeatNoBorderPOT)
150 sample_2d_linear_mipmap_linear_repeat (ctx, tObj, m,
151 texcoords + minStart,
152 lambda + minStart,
153 rgba + minStart);
154 }
155 switch (tObj->MagFilter)
156 {
157 case MESA_FORMAT_RGB:
158 opt_sample_rgb_2d (ctx, tObj, m, texcoords + magStart,
159 ((void *) 0), rgba + magStart);
160 opt_sample_rgba_2d (ctx, tObj, m, texcoords + magStart,
161 ((void *) 0), rgba + magStart);
162 sample_nearest_2d (ctx, tObj, m, texcoords + magStart,
163 ((void *) 0), rgba + magStart);
164 }
165 }
166 }
167 texture_sample_func
_swrast_choose_texture_sample_func(const struct gl_texture_object * t)168 _swrast_choose_texture_sample_func (const struct gl_texture_object *t)
169 {
170 switch (t->Target)
171 {
172 case 0x0DE0:
173 return &sample_lambda_2d;
174 }
175 }
176