src/mesa/swrast/s_texrender.c

   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
  18 static void
  19 delete_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  */
  30 static void
  31 update_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  */
  78 void
  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
  93 void
  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 }