summaryrefslogtreecommitdiff
path: root/src/mesa/main/texrender.c
blob: 12afa93d01f432c4b093febae4df7d267b043724 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197

#include "context.h"
#include "fbobject.h"
#include "texrender.h"
#include "renderbuffer.h"


/*
 * Render-to-texture code for GL_EXT_framebuffer_object
 */


/**
 * Derived from gl_renderbuffer class
 */
struct texture_renderbuffer
{
   struct gl_renderbuffer Base;   /* Base class object */
   struct gl_texture_image *TexImage;
   StoreTexelFunc Store;
   GLint Zoffset;
};



static void
texture_get_row(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
                GLint x, GLint y, void *values)
{
   /* XXX unfinished */
}

static void
texture_get_values(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
                   const GLint x[], const GLint y[], void *values)
{
   /* XXX unfinished */
}

static void
texture_put_row(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
                GLint x, GLint y, const void *values, const GLubyte *mask)
{
   const struct texture_renderbuffer *trb
      = (const struct texture_renderbuffer *) rb;
   const GLint z = trb->Zoffset;
   const GLchan *rgba = (const GLchan *) values;
   GLuint i;
   for (i = 0; i < count; i++) {
      if (!mask || mask[i]) {
         trb->Store(trb->TexImage, x + i, y, z, rgba);
      }
      rgba += 4;
   }
}

static void
texture_put_mono_row(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
                     GLint x, GLint y, const void *value, const GLubyte *mask)
{
   const struct texture_renderbuffer *trb
      = (const struct texture_renderbuffer *) rb;
   const GLint z = trb->Zoffset;
   const GLchan *rgba = (const GLchan *) value;
   GLuint i;
   for (i = 0; i < count; i++) {
      if (!mask || mask[i]) {
         trb->Store(trb->TexImage, x + i, y, z, rgba);
      }
   }
}

static void
texture_put_values(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
                   const GLint x[], const GLint y[], const void *values,
                   const GLubyte *mask)
{
   const struct texture_renderbuffer *trb
      = (const struct texture_renderbuffer *) rb;
   const GLint z = trb->Zoffset;
   const GLchan *rgba = (const GLchan *) values;
   GLuint i;
   for (i = 0; i < count; i++) {
      if (!mask || mask[i]) {
         trb->Store(trb->TexImage, x[i], y[i], z, rgba);
      }
      rgba += 4;
   }
}

static void
texture_put_mono_values(GLcontext *ctx, struct gl_renderbuffer *rb,
                        GLuint count, const GLint x[], const GLint y[],
                        const void *value, const GLubyte *mask)
{
   const struct texture_renderbuffer *trb
      = (const struct texture_renderbuffer *) rb;
   const GLint z = trb->Zoffset;
   const GLchan *rgba = (const GLchan *) value;
   GLuint i;
   for (i = 0; i < count; i++) {
      if (!mask || mask[i]) {
         trb->Store(trb->TexImage, x[i], y[i], z, rgba);
      }
   }
}


static void
delete_texture_wrapper(struct gl_renderbuffer *rb)
{
   _mesa_free(rb);
}


/**
 * If a render buffer attachment specifies a texture image, we'll use
 * this function to make a gl_renderbuffer wrapper around the texture image.
 * This allows other parts of Mesa to access the texture image as if it
 * was a renderbuffer.
 */
static void
wrap_texture(GLcontext *ctx, struct gl_renderbuffer_attachment *att)
{
   struct texture_renderbuffer *trb;
   const GLuint name = 0;

   ASSERT(att->Type == GL_TEXTURE);
   ASSERT(att->Renderbuffer == NULL);
   /*
   ASSERT(att->Complete);
   */

   trb = CALLOC_STRUCT(texture_renderbuffer);
   if (!trb) {
      _mesa_error(ctx, GL_OUT_OF_MEMORY, "wrap_texture");
      return;
   }

   _mesa_init_renderbuffer(&trb->Base, name);

   trb->TexImage = att->Texture->Image[att->CubeMapFace][att->TextureLevel];
   assert(trb->TexImage);

   trb->Store = trb->TexImage->TexFormat->StoreTexel;
   assert(trb->Store);

   trb->Zoffset = att->Zoffset;

   trb->Base.Width = trb->TexImage->Width;
   trb->Base.Height = trb->TexImage->Height;
   trb->Base.InternalFormat = trb->TexImage->IntFormat; /* XXX fix? */
   trb->Base._BaseFormat = trb->TexImage->TexFormat->BaseFormat;
   assert(trb->Base._BaseFormat == GL_RGB ||
          trb->Base._BaseFormat == GL_RGBA ||
          trb->Base._BaseFormat == GL_DEPTH_COMPONENT);
   trb->Base.DataType = GL_UNSIGNED_BYTE;  /* XXX fix! */
   trb->Base.Data = trb->TexImage->Data;

   trb->Base.GetRow = texture_get_row;
   trb->Base.GetValues = texture_get_values;
   trb->Base.PutRow = texture_put_row;
   trb->Base.PutMonoRow = texture_put_mono_row;
   trb->Base.PutValues = texture_put_values;
   trb->Base.PutMonoValues = texture_put_mono_values;

   trb->Base.Delete = delete_texture_wrapper;
   trb->Base.AllocStorage = NULL; /* illegal! */

   att->Renderbuffer = &(trb->Base);
}



/**
 * Software fallback for ctx->Driver.RenderbufferTexture.
 * This is called via the glRenderbufferTexture1D/2D/3D() functions.
 * If we're unbinding a texture, texObj will be NULL.
 * The framebuffer of interest is ctx->DrawBuffer.
 * \sa _mesa_framebuffer_renderbuffer
 */
void
_mesa_renderbuffer_texture(GLcontext *ctx,
                           struct gl_renderbuffer_attachment *att,
                           struct gl_texture_object *texObj,
                           GLenum texTarget, GLuint level, GLuint zoffset)
{
   if (texObj) {
      _mesa_set_texture_attachment(ctx, att, texObj,
                                   texTarget, level, zoffset);

      wrap_texture(ctx, att);
   }
   else {
      _mesa_remove_attachment(ctx, att);
   }
}