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