s_texrender.c revision 848b8605 
1
2#include "main/context.h"
3#include "main/colormac.h"
4#include "main/fbobject.h"
5#include "main/macros.h"
6#include "main/teximage.h"
7#include "main/renderbuffer.h"
8#include "swrast/swrast.h"
9#include "swrast/s_context.h"
10#include "swrast/s_texfetch.h"
11
12
13/*
14 * Render-to-texture code for GL_EXT_framebuffer_object
15 */
16
17
18static void
19delete_texture_wrapper(struct gl_context *ctx, struct gl_renderbuffer *rb)
20{
21   ASSERT(rb->RefCount == 0);
22   free(rb);
23}
24
25/**
26 * Update the renderbuffer wrapper for rendering to a texture.
27 * For example, update the width, height of the RB based on the texture size,
28 * update the internal format info, etc.
29 */
30static void
31update_wrapper(struct gl_context *ctx, struct gl_renderbuffer_attachment *att)
32{
33   struct gl_renderbuffer *rb = att->Renderbuffer;
34   struct swrast_renderbuffer *srb = swrast_renderbuffer(rb);
35   struct swrast_texture_image *swImage;
36   mesa_format format;
37   GLuint zOffset;
38
39   (void) ctx;
40
41   swImage = swrast_texture_image(rb->TexImage);
42   assert(swImage);
43
44   format = swImage->Base.TexFormat;
45
46   if (att->Texture->Target == GL_TEXTURE_1D_ARRAY_EXT) {
47      zOffset = 0;
48   }
49   else {
50      zOffset = att->Zoffset;
51   }
52
53   /* Want to store linear values, not sRGB */
54   rb->Format = _mesa_get_srgb_format_linear(format);
55
56   srb->Buffer = swImage->ImageSlices[zOffset];
57}
58
59
60
61/**
62 * Called when rendering to a texture image begins, or when changing
63 * the dest mipmap level, cube face, etc.
64 * This is a fallback routine for software render-to-texture.
65 *
66 * Called via the glRenderbufferTexture1D/2D/3D() functions
67 * and elsewhere (such as glTexImage2D).
68 *
69 * The image we're rendering into is
70 * att->Texture->Image[att->CubeMapFace][att->TextureLevel];
71 * It'll never be NULL.
72 *
73 * \param fb  the framebuffer object the texture is being bound to
74 * \param att  the fb attachment point of the texture
75 *
76 * \sa _mesa_framebuffer_renderbuffer
77 */
78void
79_swrast_render_texture(struct gl_context *ctx,
80                       struct gl_framebuffer *fb,
81                       struct gl_renderbuffer_attachment *att)
82{
83   struct gl_renderbuffer *rb = att->Renderbuffer;
84   (void) fb;
85
86   /* plug in our texture_renderbuffer-specific functions */
87   rb->Delete = delete_texture_wrapper;
88
89   update_wrapper(ctx, att);
90}
91
92
93void
94_swrast_finish_render_texture(struct gl_context *ctx,
95                              struct gl_renderbuffer *rb)
96{
97   /* do nothing */
98   /* The renderbuffer texture wrapper will get deleted by the
99    * normal mechanism for deleting renderbuffers.
100    */
101   (void) ctx;
102   (void) rb;
103}
104