mesa/meta: Support decompressing floating-point formats

Previously the Meta implementation of glGetTexImage would fall back to
_mesa_get_teximage if the texturing is not using an unsigned normalised
format. However in order to support the half-float formats of BPTC textures we
can make it render to a floating-point renderbuffer instead. This patch makes
decompression_state have two FBOs, one for the GL_RGBA format and one for
GL_RGBA32F. If a floating-point texture is encountered it will try setting up
a floating-point FBO. It will now also check the status of the FBO and fall
back to _mesa_get_teximage if the FBO is not complete.

Reviewed-by: Ian Romanick <[email protected]>

1 files changed, 12 insertions, 2 deletions

diff --git a/src/mesa/drivers/common/meta.h b/src/mesa/drivers/common/meta.h
index e2da2f4278c..3ec73982258 100644
--- a/src/mesa/drivers/common/meta.h
+++ b/src/mesa/drivers/common/meta.h
@@ -343,13 +343,23 @@ struct gen_mipmap_state
 };
 
 /**
+ * One of the FBO states for decompress_state. There will be one for each
+ * required renderbuffer format.
+ */
+struct decompress_fbo_state
+{
+   GLuint FBO, RBO;
+   GLint Width, Height;
+};
+
+/**
  * State for texture decompression
  */
 struct decompress_state
 {
    GLuint VAO;
-   GLuint VBO, FBO, RBO, Sampler;
-   GLint Width, Height;
+   struct decompress_fbo_state byteFBO, floatFBO;
+   GLuint VBO, Sampler;
 
    struct blit_shader_table shaders;
 };