prog_execute.c File Reference

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Detailed Description

Software interpreter for vertex/fragment programs.

Author:

Brian Paul

#include "main/glheader.h"
#include "main/colormac.h"
#include "main/context.h"
#include "program.h"
#include "prog_execute.h"
#include "prog_instruction.h"
#include "prog_parameter.h"
#include "prog_print.h"
#include "prog_noise.h"

Defines
#define	DEBUG_PROG   0
#define	SET_POS_INFINITY(x)   x = (GLfloat) HUGE_VAL
	Set x to positive or negative infinity.
#define	SET_NEG_INFINITY(x)   x = (GLfloat) -HUGE_VAL
#define	SET_FLOAT_BITS(x, bits)   ((fi_type *) (void *) &(x))->i = bits
Functions
static INLINE const GLfloat *	get_src_register_pointer (const struct prog_src_register *source, const struct gl_program_machine *machine)
	Return a pointer to the 4-element float vector specified by the given source register.
static INLINE GLfloat *	get_dst_register_pointer (const struct prog_dst_register *dest, struct gl_program_machine *machine)
	Return a pointer to the 4-element float vector specified by the given destination register.
static void	fetch_vector4 (const struct prog_src_register *source, const struct gl_program_machine *machine, GLfloat result[4])
	Fetch a 4-element float vector from the given source register.
static void	fetch_vector4ui (const struct prog_src_register *source, const struct gl_program_machine *machine, GLuint result[4])
	Fetch a 4-element uint vector from the given source register.
static void	fetch_vector4_deriv (GLcontext *ctx, const struct prog_src_register *source, const struct gl_program_machine *machine, char xOrY, GLfloat result[4])
	Fetch the derivative with respect to X or Y for the given register.
static void	fetch_vector1 (const struct prog_src_register *source, const struct gl_program_machine *machine, GLfloat result[4])
	As above, but only return result[0] element.
static INLINE void	fetch_texel (GLcontext *ctx, const struct gl_program_machine *machine, const struct prog_instruction *inst, const GLfloat texcoord[4], GLfloat lodBias, GLfloat color[4])
	Fetch texel from texture.
static INLINE GLuint	generate_cc (float value)
	Test value against zero and return GT, LT, EQ or UN if NaN.
static INLINE GLboolean	test_cc (GLuint condCode, GLuint ccMaskRule)
	Test if the ccMaskRule is satisfied by the given condition code.
static INLINE GLboolean	eval_condition (const struct gl_program_machine *machine, const struct prog_instruction *inst)
	Evaluate the 4 condition codes against a predicate and return GL_TRUE or GL_FALSE to indicate result.
static void	store_vector4 (const struct prog_instruction *inst, struct gl_program_machine *machine, const GLfloat value[4])
	Store 4 floats into a register.
static void	store_vector4ui (const struct prog_instruction *inst, struct gl_program_machine *machine, const GLuint value[4])
	Store 4 uints into a register.
GLboolean	_mesa_execute_program (GLcontext *ctx, const struct gl_program *program, struct gl_program_machine *machine)
	Execute the given vertex/fragment program.
Variables
static const GLfloat	ZeroVec [4] = { 0.0F, 0.0F, 0.0F, 0.0F }

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Define Documentation

#define DEBUG_PROG   0

#define SET_FLOAT_BITS	(	x,
		bits		)	((fi_type *) (void *) &(x))->i = bits

#define SET_NEG_INFINITY

(

x

)

x = (GLfloat) -HUGE_VAL

#define SET_POS_INFINITY

(

x

)

x = (GLfloat) HUGE_VAL

Set x to positive or negative infinity.

---

Function Documentation

GLboolean _mesa_execute_program	(	GLcontext *	ctx,
		const struct gl_program *	program,
		struct gl_program_machine *	machine
	)

Execute the given vertex/fragment program.

Parameters:

	ctx	rendering context
	program	the program to execute
	machine	machine state (must be initialized)

Returns:

GL_TRUE if program completed or GL_FALSE if program executed KIL.

static INLINE GLboolean eval_condition	(	const struct gl_program_machine *	machine,
		const struct prog_instruction *	inst
	)			[static]

Evaluate the 4 condition codes against a predicate and return GL_TRUE or GL_FALSE to indicate result.

static INLINE void fetch_texel	(	GLcontext *	ctx,
		const struct gl_program_machine *	machine,
		const struct prog_instruction *	inst,
		const GLfloat	texcoord[4],
		GLfloat	lodBias,
		GLfloat	color[4]
	)			[static]

Fetch texel from texture.

Use partial derivatives when possible.

static void fetch_vector1	(	const struct prog_src_register *	source,
		const struct gl_program_machine *	machine,
		GLfloat	result[4]
	)			[static]

As above, but only return result[0] element.

static void fetch_vector4	(	const struct prog_src_register *	source,
		const struct gl_program_machine *	machine,
		GLfloat	result[4]
	)			[static]

Fetch a 4-element float vector from the given source register.

Apply swizzling and negating as needed.

static void fetch_vector4_deriv	(	GLcontext *	ctx,
		const struct prog_src_register *	source,
		const struct gl_program_machine *	machine,
		char	xOrY,
		GLfloat	result[4]
	)			[static]

Fetch the derivative with respect to X or Y for the given register.

XXX this currently only works for fragment program input attribs.

static void fetch_vector4ui	(	const struct prog_src_register *	source,
		const struct gl_program_machine *	machine,
		GLuint	result[4]
	)			[static]

Fetch a 4-element uint vector from the given source register.

Apply swizzling but not negation/abs.

static INLINE GLuint generate_cc

(

float

value

)

[static]

Test value against zero and return GT, LT, EQ or UN if NaN.

static INLINE GLfloat* get_dst_register_pointer	(	const struct prog_dst_register *	dest,
		struct gl_program_machine *	machine
	)			[static]

Return a pointer to the 4-element float vector specified by the given destination register.

static INLINE const GLfloat* get_src_register_pointer	(	const struct prog_src_register *	source,
		const struct gl_program_machine *	machine
	)			[static]

Return a pointer to the 4-element float vector specified by the given source register.

static void store_vector4	(	const struct prog_instruction *	inst,
		struct gl_program_machine *	machine,
		const GLfloat	value[4]
	)			[static]

Store 4 floats into a register.

Observe the instructions saturate and set-condition-code flags.

static void store_vector4ui	(	const struct prog_instruction *	inst,
		struct gl_program_machine *	machine,
		const GLuint	value[4]
	)			[static]

Store 4 uints into a register.

Observe the set-condition-code flags.

static INLINE GLboolean test_cc	(	GLuint	condCode,
		GLuint	ccMaskRule
	)			[static]

Test if the ccMaskRule is satisfied by the given condition code.

Used to mask destination writes according to the current condition code.

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Variable Documentation

const GLfloat ZeroVec[4] = { 0.0F, 0.0F, 0.0F, 0.0F } [static]

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