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      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 
     17 static void
     18 delete_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  */
     29 static void
     30 update_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  */
     77 void
     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 
     92 void
     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