class ir_variable;
+/**
+ * Data structure describing a varying which is available for use in transform
+ * feedback.
+ *
+ * For example, if the vertex shader contains:
+ *
+ * struct S {
+ * vec4 foo;
+ * float[3] bar;
+ * };
+ *
+ * varying S[2] v;
+ *
+ * Then there would be tfeedback_candidate objects corresponding to the
+ * following varyings:
+ *
+ * v[0].foo
+ * v[0].bar
+ * v[1].foo
+ * v[1].bar
+ */
+struct tfeedback_candidate
+{
+ /**
+ * Toplevel variable containing this varying. In the above example, this
+ * would point to the declaration of the varying v.
+ */
+ ir_variable *toplevel_var;
+
+ /**
+ * Type of this varying. In the above example, this would point to the
+ * glsl_type for "vec4" or "float[3]".
+ */
+ const glsl_type *type;
+
+ /**
+ * Offset within the toplevel variable where this varying occurs (counted
+ * in multiples of the size of a float).
+ */
+ unsigned offset;
+};
+
+
/**
* Data structure tracking information about a transform feedback declaration
* during linking.
class tfeedback_decl
{
public:
- void init(struct gl_context *ctx, struct gl_shader_program *prog,
- const void *mem_ctx, const char *input);
+ void init(struct gl_context *ctx, const void *mem_ctx, const char *input);
static bool is_same(const tfeedback_decl &x, const tfeedback_decl &y);
- bool assign_location(struct gl_context *ctx, struct gl_shader_program *prog,
- ir_variable *output_var);
+ bool assign_location(struct gl_context *ctx,
+ struct gl_shader_program *prog);
unsigned get_num_outputs() const;
bool store(struct gl_context *ctx, struct gl_shader_program *prog,
struct gl_transform_feedback_info *info, unsigned buffer,
const unsigned max_outputs) const;
- ir_variable *find_output_var(gl_shader_program *prog,
- gl_shader *producer) const;
+ const tfeedback_candidate *find_candidate(gl_shader_program *prog,
+ hash_table *tfeedback_candidates);
bool is_next_buffer_separator() const
{
return !this->next_buffer_separator && !this->skip_components;
}
+ const char *name() const
+ {
+ return this->orig_name;
+ }
+
+ unsigned get_stream_id() const
+ {
+ return this->stream_id;
+ }
+
/**
* The total number of varying components taken up by this variable. Only
* valid if assign_location() has been called.
*/
unsigned num_components() const
{
- if (this->is_clip_distance_mesa)
+ if (this->lowered_builtin_array_variable)
return this->size;
else
- return this->vector_elements * this->matrix_columns * this->size;
+ return this->vector_elements * this->matrix_columns * this->size *
+ (this->is_double() ? 2 : 1);
+ }
+
+ unsigned get_location() const {
+ return this->location;
}
private:
+
+ bool is_double() const
+ {
+ switch (this->type) {
+ case GL_DOUBLE:
+ case GL_DOUBLE_VEC2:
+ case GL_DOUBLE_VEC3:
+ case GL_DOUBLE_VEC4:
+ case GL_DOUBLE_MAT2:
+ case GL_DOUBLE_MAT2x3:
+ case GL_DOUBLE_MAT2x4:
+ case GL_DOUBLE_MAT3:
+ case GL_DOUBLE_MAT3x2:
+ case GL_DOUBLE_MAT3x4:
+ case GL_DOUBLE_MAT4:
+ case GL_DOUBLE_MAT4x2:
+ case GL_DOUBLE_MAT4x3:
+ return true;
+ default:
+ return false;
+ }
+ }
+
/**
* The name that was supplied to glTransformFeedbackVaryings. Used for
* error reporting and glGetTransformFeedbackVarying().
unsigned array_subscript;
/**
- * True if the variable is gl_ClipDistance and the driver lowers
- * gl_ClipDistance to gl_ClipDistanceMESA.
+ * Non-zero if the variable is gl_ClipDistance, glTessLevelOuter or
+ * gl_TessLevelInner and the driver lowers it to gl_*MESA.
*/
- bool is_clip_distance_mesa;
+ enum {
+ none,
+ clip_distance,
+ tess_level_outer,
+ tess_level_inner,
+ } lowered_builtin_array_variable;
/**
* The vertex shader output location that the linker assigned for this
* Whether this is gl_NextBuffer from ARB_transform_feedback3.
*/
bool next_buffer_separator;
+
+ /**
+ * If find_candidate() has been called, pointer to the tfeedback_candidate
+ * data structure that was found. Otherwise NULL.
+ */
+ const tfeedback_candidate *matched_candidate;
+
+ /**
+ * StreamId assigned to this varying (defaults to 0). Can only be set to
+ * values other than 0 in geometry shaders that use the stream layout
+ * modifier. Accepted values must be in the range [0, MAX_VERTEX_STREAMS-1].
+ */
+ unsigned stream_id;
};
-bool
+void
cross_validate_outputs_to_inputs(struct gl_shader_program *prog,
gl_shader *producer, gl_shader *consumer);
unsigned num_tfeedback_decls,
tfeedback_decl *tfeedback_decls);
+bool
+check_against_output_limit(struct gl_context *ctx,
+ struct gl_shader_program *prog,
+ gl_shader *producer);
+
+bool
+check_against_input_limit(struct gl_context *ctx,
+ struct gl_shader_program *prog,
+ gl_shader *consumer);
+
#endif /* GLSL_LINK_VARYINGS_H */