prog_statevars.c File Reference

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Detailed Description

Program state variable management.

Author:

Brian Paul

#include "main/glheader.h"
#include "main/context.h"
#include "main/hash.h"
#include "main/imports.h"
#include "main/macros.h"
#include "main/mtypes.h"
#include "prog_statevars.h"
#include "prog_parameter.h"

Functions
static void	_mesa_fetch_state (GLcontext *ctx, const gl_state_index state[], GLfloat *value)
	Use the list of tokens in the state[] array to find global GL state and return it in .
GLbitfield	_mesa_program_state_flags (const gl_state_index state[STATE_LENGTH])
	Return a bitmask of the Mesa state flags (_NEW_* values) which would indicate that the given context state may have changed.
static void	append (char *dst, const char *src)
static void	append_token (char *dst, gl_state_index k)
	Convert token 'k' to a string, append it onto 'dst' string.
static void	append_face (char *dst, GLint face)
static void	append_index (char *dst, GLint index)
char *	_mesa_program_state_string (const gl_state_index state[STATE_LENGTH])
	Make a string from the given state vector.
void	_mesa_load_state_parameters (GLcontext *ctx, struct gl_program_parameter_list *paramList)
	Loop over all the parameters in a parameter list.
static void	load_matrix (GLfloat registers[][4], GLuint pos, const GLfloat mat[16])
	Copy the 16 elements of a matrix into four consecutive program registers starting at 'pos'.
static void	load_transpose_matrix (GLfloat registers[][4], GLuint pos, const GLfloat mat[16])
	As above, but transpose the matrix.
void	_mesa_load_tracked_matrices (GLcontext *ctx)
	Load current vertex program's parameter registers with tracked matrices (if NV program).

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Function Documentation

static void _mesa_fetch_state	(	GLcontext *	ctx,
		const gl_state_index	state[],
		GLfloat *	value
	)			[static]

Use the list of tokens in the state[] array to find global GL state and return it in

.

Usually, four values are returned in

but matrix queries may return as many as 16 values. This function is used for ARB vertex/fragment programs. The program parser will produce the state[] values.

void _mesa_load_state_parameters	(	GLcontext *	ctx,
		struct gl_program_parameter_list *	paramList
	)

Loop over all the parameters in a parameter list.

If the parameter is a GL state reference, look up the current value of that state variable and put it into the parameter's Value[4] array. This would be called at glBegin time when using a fragment program.

void _mesa_load_tracked_matrices

(

GLcontext *

ctx

)

Load current vertex program's parameter registers with tracked matrices (if NV program).

This only needs to be done per glBegin/glEnd, not per-vertex.

GLbitfield _mesa_program_state_flags

(

const gl_state_index

state[STATE_LENGTH]

)

Return a bitmask of the Mesa state flags (_NEW_* values) which would indicate that the given context state may have changed.

The bitmask is used during validation to determine if we need to update vertex/fragment program parameters (like "state.material.color") when some GL state has changed.

char* _mesa_program_state_string

(

const gl_state_index

state[STATE_LENGTH]

)

Make a string from the given state vector.

For example, return "state.matrix.texture[2].inverse". Use _mesa_free() to deallocate the string.

static void append	(	char *	dst,
		const char *	src
	)			[static]

static void append_face	(	char *	dst,
		GLint	face
	)			[static]

static void append_index	(	char *	dst,
		GLint	index
	)			[static]

static void append_token	(	char *	dst,
		gl_state_index	k
	)			[static]

Convert token 'k' to a string, append it onto 'dst' string.

static void load_matrix	(	GLfloat	registers[][4],
		GLuint	pos,
		const GLfloat	mat[16]
	)			[static]

Copy the 16 elements of a matrix into four consecutive program registers starting at 'pos'.

static void load_transpose_matrix	(	GLfloat	registers[][4],
		GLuint	pos,
		const GLfloat	mat[16]
	)			[static]

As above, but transpose the matrix.

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