New code for rendering to depth/stencil textures.

Re-org of the renderbuffer wrapper code.

1 files changed, 178 insertions, 68 deletions

diff --git a/src/mesa/main/texrender.c b/src/mesa/main/texrender.c
index 85565bfb1d..db720cef6e 100644
--- a/src/mesa/main/texrender.c
+++ b/src/mesa/main/texrender.c
@@ -22,7 +22,9 @@ struct texture_renderbuffer
 };
 
 
-
+/**
+ * Get row of values from the renderbuffer that wraps a texture image.
+ */
 static void
 texture_get_row(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
                 GLint x, GLint y, void *values)
@@ -30,13 +32,31 @@ texture_get_row(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
    const struct texture_renderbuffer *trb
       = (const struct texture_renderbuffer *) rb;
    const GLint z = trb->Zoffset;
-   GLchan *rgbaOut = (GLchan *) values;
    GLuint i;
-   for (i = 0; i < count; i++) {
-      trb->TexImage->FetchTexelc(trb->TexImage, x + i, y, z, rgbaOut + 4 * i);
+
+   ASSERT(trb->TexImage->Width == rb->Width);
+   ASSERT(trb->TexImage->Height == rb->Height);
+
+   if (rb->DataType == CHAN_TYPE) {
+      GLchan *rgbaOut = (GLchan *) values;
+      for (i = 0; i < count; i++) {
+         trb->TexImage->FetchTexelc(trb->TexImage, x + i, y, z, rgbaOut + 4 * i);
+      }
+   }
+   else if (rb->DataType == GL_UNSIGNED_INT_24_8_EXT) {
+      GLuint *zValues = (GLuint *) values;
+      for (i = 0; i < count; i++) {
+         GLfloat flt;
+         trb->TexImage->FetchTexelf(trb->TexImage, x + i, y, z, &flt);
+         zValues[i] = ((GLuint) (flt * 0xffffff)) << 8;
+      }
+   }
+   else {
+      _mesa_problem(ctx, "invalid rb->DataType in texture_get_row");
    }
 }
 
+
 static void
 texture_get_values(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
                    const GLint x[], const GLint y[], void *values)
@@ -44,14 +64,32 @@ texture_get_values(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
    const struct texture_renderbuffer *trb
       = (const struct texture_renderbuffer *) rb;
    const GLint z = trb->Zoffset;
-   GLchan *rgbaOut = (GLchan *) values;
    GLuint i;
-   for (i = 0; i < count; i++) {
-      trb->TexImage->FetchTexelc(trb->TexImage, x[i], y[i], z,
-                                 rgbaOut + 4 * i);
+
+   if (rb->DataType == CHAN_TYPE) {
+      GLchan *rgbaOut = (GLchan *) values;
+      for (i = 0; i < count; i++) {
+         trb->TexImage->FetchTexelc(trb->TexImage, x[i], y[i], z,
+                                    rgbaOut + 4 * i);
+      }
+   }
+   else if (rb->DataType == GL_UNSIGNED_INT_24_8_EXT) {
+      GLuint *zValues = (GLuint *) values;
+      for (i = 0; i < count; i++) {
+         GLfloat flt;
+         trb->TexImage->FetchTexelf(trb->TexImage, x[i], y[i], z, &flt);
+         zValues[i] = ((GLuint) (flt * 0xffffff)) << 8;
+      }
+   }
+   else {
+      _mesa_problem(ctx, "invalid rb->DataType in texture_get_values");
    }
 }
 
+
+/**
+ * Put row of values into a renderbuffer that wraps a texture image.
+ */
 static void
 texture_put_row(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
                 GLint x, GLint y, const void *values, const GLubyte *mask)
@@ -59,16 +97,32 @@ texture_put_row(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
    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);
+
+   if (rb->DataType == CHAN_TYPE) {
+      const GLchan *rgba = (const GLchan *) values;
+      for (i = 0; i < count; i++) {
+         if (!mask || mask[i]) {
+            trb->Store(trb->TexImage, x + i, y, z, rgba);
+         }
+         rgba += 4;
+      }
+   }
+   else if (rb->DataType == GL_UNSIGNED_INT_24_8_EXT) {
+      const GLuint *zValues = (const GLuint *) values;
+      for (i = 0; i < count; i++) {
+         if (!mask || mask[i]) {
+            GLfloat flt = (zValues[i] >> 8) * (1.0 / 0xffffff);
+            trb->Store(trb->TexImage, x + i, y, z, &flt);
+         }
       }
-      rgba += 4;
+   }
+   else {
+      _mesa_problem(ctx, "invalid rb->DataType in texture_put_row");
    }
 }
 
+
 static void
 texture_put_mono_row(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
                      GLint x, GLint y, const void *value, const GLubyte *mask)
@@ -76,15 +130,31 @@ texture_put_mono_row(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
    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);
+
+   if (rb->DataType == CHAN_TYPE) {
+      const GLchan *rgba = (const GLchan *) value;
+      for (i = 0; i < count; i++) {
+         if (!mask || mask[i]) {
+            trb->Store(trb->TexImage, x + i, y, z, rgba);
+         }
+      }
+   }
+   else if (rb->DataType == GL_UNSIGNED_INT_24_8_EXT) {
+      const GLuint zValue = *((const GLuint *) value);
+      const GLfloat flt = (zValue >> 8) * (1.0 / 0xffffff);
+      for (i = 0; i < count; i++) {
+         if (!mask || mask[i]) {
+            trb->Store(trb->TexImage, x + i, y, z, &flt);
+         }
       }
    }
+   else {
+      _mesa_problem(ctx, "invalid rb->DataType in texture_put_mono_row");
+   }
 }
 
+
 static void
 texture_put_values(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
                    const GLint x[], const GLint y[], const void *values,
@@ -93,16 +163,32 @@ texture_put_values(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
    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);
+
+   if (rb->DataType == CHAN_TYPE) {
+      const GLchan *rgba = (const GLchan *) values;
+      for (i = 0; i < count; i++) {
+         if (!mask || mask[i]) {
+            trb->Store(trb->TexImage, x[i], y[i], z, rgba);
+         }
+         rgba += 4;
+      }
+   }
+   else if (rb->DataType == GL_UNSIGNED_INT_24_8_EXT) {
+      const GLuint *zValues = (const GLuint *) values;
+      for (i = 0; i < count; i++) {
+         if (!mask || mask[i]) {
+            GLfloat flt = (zValues[i] >> 8) * (1.0 / 0xffffff);
+            trb->Store(trb->TexImage, x[i], y[i], z, &flt);
+         }
       }
-      rgba += 4;
+   }
+   else {
+      _mesa_problem(ctx, "invalid rb->DataType in texture_put_values");
    }
 }
 
+
 static void
 texture_put_mono_values(GLcontext *ctx, struct gl_renderbuffer *rb,
                         GLuint count, const GLint x[], const GLint y[],
@@ -111,13 +197,28 @@ texture_put_mono_values(GLcontext *ctx, struct gl_renderbuffer *rb,
    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);
+
+   if (rb->DataType == CHAN_TYPE) {
+      const GLchan *rgba = (const GLchan *) value;
+      for (i = 0; i < count; i++) {
+         if (!mask || mask[i]) {
+            trb->Store(trb->TexImage, x[i], y[i], z, rgba);
+         }
+      }
+   }
+   else if (rb->DataType == GL_UNSIGNED_INT_24_8_EXT) {
+      const GLuint zValue = *((const GLuint *) value);
+      const GLfloat flt = (zValue >> 8) * (1.0 / 0xffffff);
+      for (i = 0; i < count; i++) {
+         if (!mask || mask[i]) {
+            trb->Store(trb->TexImage, x[i], y[i], z, &flt);
+         }
       }
    }
+   else {
+      _mesa_problem(ctx, "invalid rb->DataType in texture_put_mono_values");
+   }
 }
 
 
@@ -130,10 +231,9 @@ delete_texture_wrapper(struct gl_renderbuffer *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.
+ * This function creates a renderbuffer object which wraps a texture image.
+ * The new renderbuffer is plugged into the given attachment point.
+ * This allows rendering into the texture as if it were a renderbuffer.
  */
 static void
 wrap_texture(GLcontext *ctx, struct gl_renderbuffer_attachment *att)
@@ -143,9 +243,6 @@ wrap_texture(GLcontext *ctx, struct gl_renderbuffer_attachment *att)
 
    ASSERT(att->Type == GL_TEXTURE);
    ASSERT(att->Renderbuffer == NULL);
-   /*
-   ASSERT(att->Complete);
-   */
 
    trb = CALLOC_STRUCT(texture_renderbuffer);
    if (!trb) {
@@ -153,48 +250,75 @@ wrap_texture(GLcontext *ctx, struct gl_renderbuffer_attachment *att)
       return;
    }
 
+   /* init base gl_renderbuffer fields */
    _mesa_init_renderbuffer(&trb->Base, name);
+   /* plug in our texture_renderbuffer-specific functions */
+   trb->Base.Delete = delete_texture_wrapper;
+   trb->Base.AllocStorage = NULL; /* illegal! */
+   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;
+
+   /* update attachment point */
+   att->Renderbuffer = &(trb->Base);
+}
+
+
+
+/**
+ * Update the renderbuffer wrapper for rendering to a texture.
+ * For example, update the width, height of the RB based on the texture size,
+ * update the internal format info, etc.
+ */
+static void
+update_wrapper(GLcontext *ctx, const struct gl_renderbuffer_attachment *att)
+{
+   struct texture_renderbuffer *trb
+      = (struct texture_renderbuffer *) att->Renderbuffer;
+
+   ASSERT(trb);
 
    trb->TexImage = att->Texture->Image[att->CubeMapFace][att->TextureLevel];
-   assert(trb->TexImage);
+   ASSERT(trb->TexImage);
 
    trb->Store = trb->TexImage->TexFormat->StoreTexel;
-   assert(trb->Store);
+   ASSERT(trb->Store);
 
    trb->Zoffset = att->Zoffset;
 
    trb->Base.Width = trb->TexImage->Width;
    trb->Base.Height = trb->TexImage->Height;
-   trb->Base.InternalFormat = trb->TexImage->InternalFormat; /* XXX fix? */
+   trb->Base.InternalFormat = trb->TexImage->InternalFormat;
+   /* XXX may need more special cases here */
+   if (trb->TexImage->TexFormat->BaseFormat == GL_DEPTH_STENCIL_EXT) {
+      trb->Base._ActualFormat = GL_DEPTH24_STENCIL8_EXT;
+      trb->Base.DataType = GL_UNSIGNED_INT_24_8_EXT;
+   }
+   else if (trb->TexImage->TexFormat->BaseFormat == GL_DEPTH_COMPONENT) {
+      trb->Base._ActualFormat = GL_DEPTH_COMPONENT;
+      trb->Base.DataType = GL_FLOAT;
+   }
+   else {
+      trb->Base._ActualFormat = trb->TexImage->InternalFormat;
+      trb->Base.DataType = CHAN_TYPE;
+   }
    trb->Base._BaseFormat = trb->TexImage->TexFormat->BaseFormat;
 #if 0
    /* fix/avoid this assertion someday */
-   assert(trb->Base._BaseFormat == GL_RGB ||
+   ASSERT(trb->Base._BaseFormat == GL_RGB ||
           trb->Base._BaseFormat == GL_RGBA ||
           trb->Base._BaseFormat == GL_DEPTH_COMPONENT);
 #endif
-   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! */
-
-   /* XXX fix these */
    trb->Base.RedBits = trb->TexImage->TexFormat->RedBits;
    trb->Base.GreenBits = trb->TexImage->TexFormat->GreenBits;
    trb->Base.BlueBits = trb->TexImage->TexFormat->BlueBits;
    trb->Base.AlphaBits = trb->TexImage->TexFormat->AlphaBits;
    trb->Base.DepthBits = trb->TexImage->TexFormat->DepthBits;
-
-   att->Renderbuffer = &(trb->Base);
-   trb->Base.RefCount++;
 }
 
 
@@ -221,24 +345,10 @@ _mesa_render_texture(GLcontext *ctx,
                      struct gl_framebuffer *fb,
                      struct gl_renderbuffer_attachment *att)
 {
-   struct gl_texture_image *newImage
-      = att->Texture->Image[att->CubeMapFace][att->TextureLevel];
-   struct texture_renderbuffer *trb
-      = (struct texture_renderbuffer *) att->Renderbuffer;
-   struct gl_texture_image *oldImage = trb ? trb->TexImage : NULL;
-
-   (void) fb;
-
-   ASSERT(newImage);
-
-   if (oldImage != newImage) {
-      if (trb) {
-         /* get rid of old wrapper */
-         /* XXX also if Zoffset changes? */
-         trb->Base.Delete(&trb->Base);
-      }
+   if (!att->Renderbuffer) {
       wrap_texture(ctx, att);
    }
+   update_wrapper(ctx, att);
 }