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gl_util.c
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gl_util.c
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#include "gl_util.h"
int gl_texparameter_count(GLenum pname)
{
#ifdef GL_EXT_texture_object
switch (pname) {
case GL_TEXTURE_PRIORITY_EXT:
case GL_TEXTURE_RESIDENT_EXT:
return 1;
}
#endif
/* FIXME: Missing stuff? */
#ifdef GL_VERSION_1_2
switch (pname) {
case GL_TEXTURE_WRAP_R:
case GL_TEXTURE_DEPTH:
return 1;
case GL_TEXTURE_MIN_LOD:
case GL_TEXTURE_MAX_LOD:
case GL_TEXTURE_BASE_LEVEL:
case GL_TEXTURE_MAX_LEVEL:
return 1;
}
#endif
switch (pname) {
case GL_TEXTURE_MAG_FILTER:
case GL_TEXTURE_MIN_FILTER:
case GL_TEXTURE_WRAP_S:
case GL_TEXTURE_WRAP_T:
case GL_TEXTURE_PRIORITY:
case GL_TEXTURE_RESIDENT:
return 1;
case GL_TEXTURE_BORDER_COLOR:
return 4;
default:
croak("Unknown texparameter parameter");
}
return 0; // Just to make the compiler happy
}
int gl_texenv_count(GLenum pname)
{
switch (pname) {
case GL_TEXTURE_ENV_MODE:
return 1;
case GL_TEXTURE_ENV_COLOR:
return 4;
default:
croak("Unknown texenv parameter");
}
return 0; // Just to make the compiler happy
}
int gl_texgen_count(GLenum pname)
{
switch (pname) {
case GL_TEXTURE_GEN_MODE:
return 1;
case GL_OBJECT_PLANE:
case GL_EYE_PLANE:
return 4;
default:
croak("Unknown texgen parameter");
}
return 0; // Just to make the compiler happy
}
int gl_material_count(GLenum pname)
{
switch (pname) {
case GL_AMBIENT:
case GL_DIFFUSE:
case GL_AMBIENT_AND_DIFFUSE:
case GL_SPECULAR:
case GL_EMISSION:
return 4;
case GL_COLOR_INDEXES:
return 3;
case GL_SHININESS:
return 1;
default:
croak("Unknown material parameter");
}
return 0; // Just to make the compiler happy
}
int gl_map_count(GLenum target, GLenum query)
{
switch (query) {
case GL_COEFF:
switch (target) {
case GL_MAP1_VERTEX_3:
case GL_MAP1_NORMAL:
case GL_MAP1_TEXTURE_COORD_3:
return 3;
case GL_MAP1_VERTEX_4:
case GL_MAP1_COLOR_4:
case GL_MAP1_TEXTURE_COORD_4:
return 4;
case GL_MAP1_TEXTURE_COORD_2:
return 2;
case GL_MAP1_INDEX:
case GL_MAP1_TEXTURE_COORD_1:
return 1;
case GL_MAP2_VERTEX_3:
case GL_MAP2_NORMAL:
case GL_MAP2_TEXTURE_COORD_3:
return 3;
case GL_MAP2_VERTEX_4:
case GL_MAP2_COLOR_4:
case GL_MAP2_TEXTURE_COORD_4:
return 4;
case GL_MAP2_TEXTURE_COORD_2:
return 2;
case GL_MAP2_INDEX:
case GL_MAP2_TEXTURE_COORD_1:
return 1;
default:
croak("Unknown map target");
}
case GL_ORDER:
switch (target) {
case GL_MAP1_VERTEX_3:
case GL_MAP1_NORMAL:
case GL_MAP1_TEXTURE_COORD_3:
case GL_MAP1_VERTEX_4:
case GL_MAP1_COLOR_4:
case GL_MAP1_TEXTURE_COORD_4:
case GL_MAP1_TEXTURE_COORD_2:
case GL_MAP1_INDEX:
case GL_MAP1_TEXTURE_COORD_1:
return 1;
case GL_MAP2_VERTEX_3:
case GL_MAP2_NORMAL:
case GL_MAP2_TEXTURE_COORD_3:
case GL_MAP2_VERTEX_4:
case GL_MAP2_COLOR_4:
case GL_MAP2_TEXTURE_COORD_4:
case GL_MAP2_TEXTURE_COORD_2:
case GL_MAP2_INDEX:
case GL_MAP2_TEXTURE_COORD_1:
return 2;
default:
croak("Unknown map target");
}
case GL_DOMAIN:
switch (target) {
case GL_MAP1_VERTEX_3:
case GL_MAP1_NORMAL:
case GL_MAP1_TEXTURE_COORD_3:
case GL_MAP1_VERTEX_4:
case GL_MAP1_COLOR_4:
case GL_MAP1_TEXTURE_COORD_4:
case GL_MAP1_TEXTURE_COORD_2:
case GL_MAP1_INDEX:
case GL_MAP1_TEXTURE_COORD_1:
return 2;
case GL_MAP2_VERTEX_3:
case GL_MAP2_NORMAL:
case GL_MAP2_TEXTURE_COORD_3:
case GL_MAP2_VERTEX_4:
case GL_MAP2_COLOR_4:
case GL_MAP2_TEXTURE_COORD_4:
case GL_MAP2_TEXTURE_COORD_2:
case GL_MAP2_INDEX:
case GL_MAP2_TEXTURE_COORD_1:
return 4;
default:
croak("Unknown map target");
}
default:
croak("Unknown map query");
}
return 0; // Just to make the compiler happy
}
int gl_light_count(GLenum pname)
{
switch (pname) {
case GL_AMBIENT:
case GL_DIFFUSE:
case GL_SPECULAR:
case GL_POSITION:
return 4;
case GL_SPOT_DIRECTION:
return 3;
case GL_SPOT_EXPONENT:
case GL_SPOT_CUTOFF:
case GL_CONSTANT_ATTENUATION:
case GL_LINEAR_ATTENUATION:
case GL_QUADRATIC_ATTENUATION:
return 1;
default:
croak("Unknown light parameter");
}
return 0; // Just to make the compiler happy
}
int gl_lightmodel_count(GLenum pname)
{
switch (pname) {
case GL_LIGHT_MODEL_AMBIENT:
return 4;
case GL_LIGHT_MODEL_LOCAL_VIEWER:
case GL_LIGHT_MODEL_TWO_SIDE:
return 1;
default:
croak("Unknown light model");
}
return 0; // Just to make the compiler happy
}
int gl_fog_count(GLenum pname)
{
switch (pname) {
case GL_FOG_COLOR:
return 4;
case GL_FOG_MODE:
case GL_FOG_DENSITY:
case GL_FOG_START:
case GL_FOG_END:
case GL_FOG_INDEX:
return 1;
default:
croak("Unknown fog parameter");
}
return 0; // Just to make the compiler happy
}
int gl_get_count(GLenum param)
{
/* 3 */
#ifdef GL_EXT_polygon_offset
switch (param) {
case GL_POLYGON_OFFSET_EXT:
case GL_POLYGON_OFFSET_FACTOR_EXT:
case GL_POLYGON_OFFSET_BIAS_EXT:
return 1;
}
#endif
#ifdef GL_VERSION_1_2
switch (param) {
case GL_TEXTURE_3D:
case GL_UNPACK_SKIP_IMAGES:
case GL_UNPACK_IMAGE_HEIGHT:
case GL_PACK_SKIP_IMAGES:
case GL_PACK_IMAGE_HEIGHT:
case GL_MAX_3D_TEXTURE_SIZE:
return 1;
case GL_RESCALE_NORMAL:
return 1;
case GL_LIGHT_MODEL_COLOR_CONTROL:
return 1;
case GL_MAX_ELEMENTS_VERTICES:
case GL_MAX_ELEMENTS_INDICES:
return 1;
}
#endif
#ifdef GL_VERSION_1_1
switch (param) {
case GL_TEXTURE_COORD_ARRAY:
case GL_TEXTURE_COORD_ARRAY_SIZE:
case GL_TEXTURE_COORD_ARRAY_STRIDE:
case GL_TEXTURE_COORD_ARRAY_TYPE:
case GL_VERTEX_ARRAY:
case GL_VERTEX_ARRAY_SIZE:
case GL_VERTEX_ARRAY_STRIDE:
case GL_VERTEX_ARRAY_TYPE:
case GL_POLYGON_OFFSET_FACTOR:
case GL_POLYGON_OFFSET_UNITS:
case GL_POLYGON_OFFSET_FILL:
case GL_POLYGON_OFFSET_LINE:
case GL_POLYGON_OFFSET_POINT:
case GL_NORMAL_ARRAY:
case GL_NORMAL_ARRAY_STRIDE:
case GL_NORMAL_ARRAY_TYPE:
case GL_INDEX_LOGIC_OP:
case GL_INDEX_ARRAY:
case GL_INDEX_ARRAY_STRIDE:
case GL_INDEX_ARRAY_TYPE:
case GL_EDGE_FLAG_ARRAY:
case GL_EDGE_FLAG_ARRAY_STRIDE:
case GL_COLOR_ARRAY:
case GL_COLOR_ARRAY_SIZE:
case GL_COLOR_ARRAY_STRIDE:
case GL_COLOR_ARRAY_TYPE:
case GL_COLOR_LOGIC_OP:
return 1;
}
#endif
/* 18 */
#ifdef GL_EXT_cmyka
switch (param) {
case GL_PACK_CMYK_HINT_EXT:
case GL_UNPACK_CMYK_HINT_EXT:
return 1;
}
#endif
/* 30 */
#ifdef GL_EXT_vertex_array
switch (param) {
case GL_VERTEX_ARRAY_EXT:
case GL_VERTEX_ARRAY_SIZE_EXT:
case GL_VERTEX_ARRAY_STRIDE_EXT:
case GL_VERTEX_ARRAY_TYPE_EXT:
case GL_VERTEX_ARRAY_COUNT_EXT:
case GL_NORMAL_ARRAY_EXT:
case GL_NORMAL_ARRAY_STRIDE_EXT:
case GL_NORMAL_ARRAY_TYPE_EXT:
case GL_NORMAL_ARRAY_COUNT_EXT:
case GL_COLOR_ARRAY_EXT:
case GL_COLOR_ARRAY_SIZE_EXT:
case GL_COLOR_ARRAY_STRIDE_EXT:
case GL_COLOR_ARRAY_TYPE_EXT:
case GL_COLOR_ARRAY_COUNT_EXT:
case GL_INDEX_ARRAY_EXT:
case GL_INDEX_ARRAY_STRIDE_EXT:
case GL_INDEX_ARRAY_TYPE_EXT:
case GL_INDEX_ARRAY_COUNT_EXT:
case GL_TEXTURE_COORD_ARRAY_EXT:
case GL_TEXTURE_COORD_ARRAY_SIZE_EXT:
case GL_TEXTURE_COORD_ARRAY_STRIDE_EXT:
case GL_TEXTURE_COORD_ARRAY_TYPE_EXT:
case GL_TEXTURE_COORD_ARRAY_COUNT_EXT:
case GL_EDGE_FLAG_ARRAY_EXT:
case GL_EDGE_FLAG_ARRAY_STRIDE_EXT:
case GL_EDGE_FLAG_ARRAY_COUNT_EXT:
return 1;
}
#endif
#ifdef GL_EXT_framebuffer_object
switch (param) {
case GL_FRAMEBUFFER_BINDING_EXT:
case GL_RENDERBUFFER_BINDING_EXT:
case GL_MAX_COLOR_ATTACHMENTS_EXT:
case GL_MAX_RENDERBUFFER_SIZE_EXT:
return 1;
}
#endif
#ifdef GL_ARB_point_sprite
switch (param) {
case GL_POINT_SPRITE_ARB:
case GL_COORD_REPLACE_ARB:
return 1;
}
#endif
#ifdef GL_ARB_point_parameters
switch (param) {
case GL_POINT_SIZE_MIN_ARB:
case GL_POINT_SIZE_MAX_ARB:
case GL_POINT_FADE_THRESHOLD_SIZE_ARB:
return 1;
case GL_POINT_DISTANCE_ATTENUATION_ARB:
return 3;
}
#endif
/* 79 */
#if defined(GL_EXT_clip_volume_hint) && defined(GL_VOLUME_CLIPPING_HINT_EXT)
switch (param) {
case GL_VOLUME_CLIPPING_HINT_EXT:
return 1;
}
#endif
switch (param) {
case GL_ACCUM_ALPHA_BITS:
case GL_ACCUM_RED_BITS:
case GL_ACCUM_BLUE_BITS:
case GL_ACCUM_GREEN_BITS:
case GL_ALPHA_BIAS:
case GL_ALPHA_BITS:
case GL_ALPHA_SCALE:
case GL_ALPHA_TEST:
case GL_ALPHA_TEST_FUNC:
case GL_ALPHA_TEST_REF:
case GL_ATTRIB_STACK_DEPTH:
case GL_AUTO_NORMAL:
case GL_AUX_BUFFERS:
case GL_BLEND:
case GL_BLEND_DST:
case GL_BLEND_EQUATION_EXT:
case GL_BLEND_SRC:
case GL_BLUE_BIAS:
case GL_BLUE_BITS:
case GL_BLUE_SCALE:
case GL_CLIENT_ATTRIB_STACK_DEPTH:
case GL_COLOR_MATERIAL:
case GL_COLOR_MATERIAL_FACE:
case GL_COLOR_MATERIAL_PARAMETER:
case GL_CULL_FACE:
case GL_CULL_FACE_MODE:
case GL_CURRENT_INDEX:
case GL_CURRENT_RASTER_DISTANCE:
case GL_CURRENT_RASTER_INDEX:
case GL_CURRENT_RASTER_POSITION_VALID:
case GL_DEPTH_BIAS:
case GL_DEPTH_BITS:
case GL_DEPTH_CLEAR_VALUE:
case GL_DEPTH_FUNC:
case GL_DEPTH_SCALE:
case GL_DEPTH_TEST:
case GL_DEPTH_WRITEMASK:
case GL_DITHER:
case GL_DOUBLEBUFFER:
case GL_DRAW_BUFFER:
case GL_EDGE_FLAG:
case GL_FOG_DENSITY:
case GL_FOG_END:
case GL_FOG_HINT:
case GL_FOG_INDEX:
case GL_FOG_MODE:
case GL_FOG_START:
case GL_FRONT_FACE:
case GL_GREEN_BIAS:
case GL_GREEN_BITS:
case GL_GREEN_SCALE:
case GL_INDEX_BITS:
case GL_INDEX_CLEAR_VALUE:
case GL_INDEX_MODE:
case GL_INDEX_OFFSET:
case GL_INDEX_SHIFT:
case GL_INDEX_WRITEMASK:
case GL_LIGHTING:
case GL_LIGHT_MODEL_LOCAL_VIEWER:
case GL_LIGHT_MODEL_TWO_SIDE:
case GL_LINE_SMOOTH:
case GL_LINE_SMOOTH_HINT:
case GL_LINE_STIPPLE:
case GL_LINE_STIPPLE_PATTERN:
case GL_LINE_STIPPLE_REPEAT:
case GL_LINE_WIDTH:
case GL_LINE_WIDTH_GRANULARITY:
case GL_LIST_BASE:
case GL_LIST_INDEX:
case GL_LIST_MODE:
case GL_LOGIC_OP_MODE:
case GL_MAP1_COLOR_4:
case GL_MAP1_GRID_SEGMENTS:
case GL_MAP1_INDEX:
case GL_MAP1_NORMAL:
case GL_MAP1_TEXTURE_COORD_1:
case GL_MAP1_TEXTURE_COORD_2:
case GL_MAP1_TEXTURE_COORD_3:
case GL_MAP1_TEXTURE_COORD_4:
case GL_MAP1_VERTEX_3:
case GL_MAP1_VERTEX_4:
case GL_MAP2_INDEX:
case GL_MAP2_NORMAL:
case GL_MAP2_TEXTURE_COORD_1:
case GL_MAP2_TEXTURE_COORD_2:
case GL_MAP2_TEXTURE_COORD_3:
case GL_MAP2_TEXTURE_COORD_4:
case GL_MAP2_VERTEX_3:
case GL_MAP2_VERTEX_4:
case GL_MAP_COLOR:
case GL_MAP_STENCIL:
case GL_MATRIX_MODE:
case GL_MAX_CLIENT_ATTRIB_STACK_DEPTH:
case GL_MAX_ATTRIB_STACK_DEPTH:
case GL_MAX_CLIP_PLANES:
case GL_MAX_EVAL_ORDER:
case GL_MAX_LIGHTS:
case GL_MAX_LIST_NESTING:
case GL_MAX_MODELVIEW_STACK_DEPTH:
case GL_MAX_NAME_STACK_DEPTH:
case GL_MAX_PIXEL_MAP_TABLE:
case GL_MAX_PROJECTION_STACK_DEPTH:
case GL_MAX_TEXTURE_SIZE:
case GL_MAX_TEXTURE_STACK_DEPTH:
case GL_MODELVIEW_STACK_DEPTH:
case GL_NAME_STACK_DEPTH:
case GL_NORMALIZE:
case GL_PACK_ALIGNMENT:
case GL_PACK_LSB_FIRST:
case GL_PACK_ROW_LENGTH:
case GL_PACK_SKIP_PIXELS:
case GL_PACK_SKIP_ROWS:
case GL_PACK_SWAP_BYTES:
case GL_PERSPECTIVE_CORRECTION_HINT:
case GL_PIXEL_MAP_A_TO_A_SIZE:
case GL_PIXEL_MAP_B_TO_B_SIZE:
case GL_PIXEL_MAP_G_TO_G_SIZE:
case GL_PIXEL_MAP_I_TO_A_SIZE:
case GL_PIXEL_MAP_I_TO_B_SIZE:
case GL_PIXEL_MAP_I_TO_G_SIZE:
case GL_PIXEL_MAP_I_TO_I_SIZE:
case GL_PIXEL_MAP_I_TO_R_SIZE:
case GL_PIXEL_MAP_R_TO_R_SIZE:
case GL_PIXEL_MAP_S_TO_S_SIZE:
case GL_POINT_SIZE:
case GL_POINT_SIZE_GRANULARITY:
case GL_POINT_SIZE_RANGE:
case GL_POINT_SMOOTH:
case GL_POINT_SMOOTH_HINT:
case GL_POLYGON_SMOOTH:
case GL_POLYGON_SMOOTH_HINT:
case GL_POLYGON_STIPPLE:
case GL_PROJECTION_STACK_DEPTH:
case GL_READ_BUFFER:
case GL_RED_BIAS:
case GL_RED_BITS:
case GL_RED_SCALE:
case GL_RENDER_MODE:
case GL_RGBA_MODE:
case GL_SCISSOR_TEST:
case GL_SHADE_MODEL:
case GL_STENCIL_BITS:
case GL_STENCIL_CLEAR_VALUE:
case GL_STENCIL_FAIL:
case GL_STENCIL_FUNC:
case GL_STENCIL_PASS_DEPTH_FAIL:
case GL_STENCIL_PASS_DEPTH_PASS:
case GL_STENCIL_REF:
case GL_STENCIL_TEST:
case GL_STENCIL_VALUE_MASK:
case GL_STENCIL_WRITEMASK:
case GL_STEREO:
case GL_SUBPIXEL_BITS:
case GL_TEXTURE_1D:
case GL_TEXTURE_BINDING_1D:
case GL_TEXTURE_2D:
case GL_TEXTURE_BINDING_2D:
case GL_TEXTURE_GEN_Q:
case GL_TEXTURE_GEN_R:
case GL_TEXTURE_GEN_S:
case GL_TEXTURE_GEN_T:
case GL_TEXTURE_STACK_DEPTH:
case GL_UNPACK_ALIGNMENT:
case GL_UNPACK_LSB_FIRST:
case GL_UNPACK_ROW_LENGTH:
case GL_UNPACK_SKIP_PIXELS:
case GL_UNPACK_SKIP_ROWS:
case GL_UNPACK_SWAP_BYTES:
case GL_ZOOM_X:
case GL_ZOOM_Y:
return 1;
case GL_DEPTH_RANGE:
case GL_LINE_WIDTH_RANGE:
case GL_MAP1_GRID_DOMAIN:
case GL_MAP2_GRID_SEGMENTS:
case GL_MAX_VIEWPORT_DIMS:
case GL_POLYGON_MODE:
return 2;
case GL_CURRENT_NORMAL:
return 3;
case GL_ACCUM_CLEAR_VALUE:
case GL_BLEND_COLOR_EXT:
case GL_COLOR_CLEAR_VALUE:
case GL_COLOR_WRITEMASK:
case GL_CURRENT_COLOR:
case GL_CURRENT_RASTER_COLOR:
case GL_CURRENT_RASTER_POSITION:
case GL_CURRENT_RASTER_TEXTURE_COORDS:
case GL_CURRENT_TEXTURE_COORDS:
case GL_FOG_COLOR:
case GL_LIGHT_MODEL_AMBIENT:
case GL_MAP2_GRID_DOMAIN:
case GL_SCISSOR_BOX:
case GL_VIEWPORT:
return 4;
case GL_MODELVIEW_MATRIX:
case GL_PROJECTION_MATRIX:
case GL_TEXTURE_MATRIX:
return 16;
default:
{
/* GL_LIGHTi = 1 */
static GLint max_lights = 0;
if (!max_lights)
glGetIntegerv(GL_MAX_LIGHTS, &max_lights);
if ((param > GL_LIGHT0) && (param <= (GLenum)(GL_LIGHT0 + max_lights)))
return 1;
}
{
/* GL_CLIP_PLANEi = 1 */
static GLint max_clip_planes = 0;
if (!max_clip_planes)
glGetIntegerv(GL_MAX_CLIP_PLANES, &max_clip_planes);
if ((param > GL_CLIP_PLANE0) && (param <= (GLenum)(GL_CLIP_PLANE0 + max_clip_planes)))
return 1;
}
croak("Unknown param");
}
return 0; // Just to make the compiler happy
}
int gl_pixelmap_size(GLenum map)
{
GLint s;
switch (map) {
case GL_PIXEL_MAP_I_TO_I:
glGetIntegerv(GL_PIXEL_MAP_I_TO_I_SIZE, &s);
return s;
case GL_PIXEL_MAP_S_TO_S:
glGetIntegerv(GL_PIXEL_MAP_S_TO_S_SIZE, &s);
return s;
case GL_PIXEL_MAP_I_TO_R:
glGetIntegerv(GL_PIXEL_MAP_I_TO_R_SIZE, &s);
return s;
case GL_PIXEL_MAP_I_TO_G:
glGetIntegerv(GL_PIXEL_MAP_I_TO_G_SIZE, &s);
return s;
case GL_PIXEL_MAP_I_TO_B:
glGetIntegerv(GL_PIXEL_MAP_I_TO_B_SIZE, &s);
return s;
case GL_PIXEL_MAP_I_TO_A:
glGetIntegerv(GL_PIXEL_MAP_I_TO_A_SIZE, &s);
return s;
case GL_PIXEL_MAP_R_TO_R:
glGetIntegerv(GL_PIXEL_MAP_R_TO_R_SIZE, &s);
return s;
case GL_PIXEL_MAP_G_TO_G:
glGetIntegerv(GL_PIXEL_MAP_G_TO_G_SIZE, &s);
return s;
case GL_PIXEL_MAP_B_TO_B:
glGetIntegerv(GL_PIXEL_MAP_B_TO_B_SIZE, &s);
return s;
case GL_PIXEL_MAP_A_TO_A:
glGetIntegerv(GL_PIXEL_MAP_A_TO_A_SIZE, &s);
return s;
default:
croak("unknown pixelmap");
}
return 0; // Just to make the compiler happy
}
int gl_state_count(GLenum state) {
switch (state) {
case GL_CURRENT_COLOR: return 4;
case GL_CURRENT_INDEX: return 1;
}
return 0;
}
unsigned long gl_pixelbuffer_size(
GLenum format,
GLsizei width,
GLsizei height,
GLenum type,
int mode);
GLvoid * EL(SV * sv, int needlen)
{
STRLEN skip = 0;
SV * svref;
if (SvREADONLY(sv))
croak("Readonly value for buffer");
if(SvROK(sv)) {
svref = SvRV(sv);
sv = svref;
}
else
{
#ifdef USE_STRICT_UNGLOB
if (SvFAKE(sv) && SvTYPE(sv) == SVt_PVGV)
sv_unglob(sv);
#endif
SvUPGRADE(sv, SVt_PV);
SvGROW(sv, (unsigned int)(needlen + 1));
SvPOK_on(sv);
SvCUR_set(sv, needlen);
*SvEND(sv) = '\0'; /* Why is this here? -chm */
}
return SvPV_force(sv, skip);
}
GLvoid * ELI(SV * sv, GLsizei width, GLsizei height,
GLenum format, GLenum type, int mode)
{
int needlen = 0;
if (!SvROK(sv)) /* don't calc length if arg is a perl ref */
needlen = gl_pixelbuffer_size(format, width, height, type, mode);
return EL(sv, needlen);
}
int gl_type_size(GLenum type)
{
switch (type) {
#ifdef GL_VERSION_1_2
case GL_UNSIGNED_BYTE_3_3_2:
case GL_UNSIGNED_BYTE_2_3_3_REV:
return sizeof(GLubyte);
case GL_UNSIGNED_SHORT_5_6_5:
case GL_UNSIGNED_SHORT_5_6_5_REV:
case GL_UNSIGNED_SHORT_4_4_4_4:
case GL_UNSIGNED_SHORT_4_4_4_4_REV:
case GL_UNSIGNED_SHORT_5_5_5_1:
case GL_UNSIGNED_SHORT_1_5_5_5_REV:
return sizeof(GLushort);
case GL_UNSIGNED_INT_8_8_8_8:
case GL_UNSIGNED_INT_8_8_8_8_REV:
case GL_UNSIGNED_INT_10_10_10_2:
case GL_UNSIGNED_INT_2_10_10_10_REV:
return sizeof(GLuint);
#endif
case GL_UNSIGNED_BYTE: return sizeof(GLubyte); break;
case GL_BITMAP: return sizeof(GLubyte); break;
case GL_BYTE: return sizeof(GLbyte); break;
case GL_UNSIGNED_SHORT: return sizeof(GLushort); break;
case GL_SHORT: return sizeof(GLshort); break;
case GL_UNSIGNED_INT: return sizeof(GLuint); break;
case GL_INT: return sizeof(GLint); break;
case GL_FLOAT: return sizeof(GLfloat); break;
case GL_DOUBLE: return sizeof(GLdouble); break;
case GL_2_BYTES: return 2;
case GL_3_BYTES: return 3;
case GL_4_BYTES: return 4;
default:
croak("unknown type");
}
return 0; // Just to make the compiler happy
}
int gl_component_count(GLenum format, GLenum type)
{
int n;
switch (format) {
#ifdef GL_VERSION_1_2
case GL_BGR:
n = 3; break;
case GL_BGRA:
n = 4; break;
#endif
/* 18 */
#ifdef GL_EXT_cmyka
case GL_CMYK:
n = 4; break;
case GL_CMYKA:
n = 5; break;
#endif
#ifdef GL_EXT_agbr
case GL_AGBR:
n = 4; break;
#endif
case GL_COLOR_INDEX:
case GL_STENCIL_INDEX:
case GL_DEPTH_COMPONENT:
case GL_RED:
case GL_GREEN:
case GL_BLUE:
case GL_ALPHA:
case GL_LUMINANCE:
n = 1; break;
case GL_LUMINANCE_ALPHA:
n = 2; break;
case GL_RGB:
n = 3; break;
case GL_RGBA:
n = 4; break;
default:
croak("unknown format");
}
#ifdef GL_VERSION_1_2
switch (type) {
case GL_UNSIGNED_BYTE_3_3_2:
case GL_UNSIGNED_BYTE_2_3_3_REV:
case GL_UNSIGNED_SHORT_5_6_5:
case GL_UNSIGNED_SHORT_5_6_5_REV:
case GL_UNSIGNED_SHORT_4_4_4_4:
case GL_UNSIGNED_SHORT_4_4_4_4_REV:
case GL_UNSIGNED_SHORT_5_5_5_1:
case GL_UNSIGNED_SHORT_1_5_5_5_REV:
case GL_UNSIGNED_INT_8_8_8_8:
case GL_UNSIGNED_INT_8_8_8_8_REV:
case GL_UNSIGNED_INT_10_10_10_2:
case GL_UNSIGNED_INT_2_10_10_10_REV:
n = 1;
}
#endif
return n;
}
/* From Mesa */
/* Compute ceiling of integer quotient of A divided by B: */
#define CEILING( A, B ) ( (A) % (B) == 0 ? (A)/(B) : (A)/(B)+1 )
unsigned long gl_pixelbuffer_size(
GLenum format,
GLsizei width,
GLsizei height,
GLenum type,
int mode)
{
GLint n; /* elements in a group */
GLint l; /* number of groups in a row */
GLint r; /* pack/unpack row length (overrides l if nonzero) */
GLint s; /* size (in bytes) of an element */
GLint a; /* alignment */
unsigned long k; /* size in bytes of row */
r = 0;
a = 4;
if (mode == gl_pixelbuffer_pack) {
glGetIntegerv(GL_PACK_ROW_LENGTH, &r);
glGetIntegerv(GL_PACK_ALIGNMENT, &a);
} else if (mode == gl_pixelbuffer_unpack) {
glGetIntegerv(GL_UNPACK_ROW_LENGTH, &r);
glGetIntegerv(GL_UNPACK_ALIGNMENT, &a);
}
l = r > 0 ? r : width;
s = gl_type_size(type);
n = gl_component_count(format, type);
/* From Mesa, more or less */
if (type == GL_BITMAP) {
k = a * CEILING( n * l, 8 * a);
} else {
k = l * s * n;
if ( s < a ) {
k = (a / s * CEILING(k, a)) * s;
}
}
return k * height;
}
/* Compute ceiling of integer quotient of A divided by B: */
#define CEILING( A, B ) ( (A) % (B) == 0 ? (A)/(B) : (A)/(B)+1 )
void gl_pixelbuffer_size2(
GLsizei width,
GLsizei height,
GLsizei depth,
GLenum format,
GLenum type,
int mode,
GLsizei * length,
GLsizei * items)
{
GLint n; /* elements in a group */
GLint l; /* number of groups in a row */
GLint s; /* size (in bytes) of an element */
GLint a; /* alignment */
unsigned long k; /* size in bytes of row */
a = 4;
l = width;
if (mode == gl_pixelbuffer_pack) {
glGetIntegerv(GL_PACK_ROW_LENGTH, &l);
glGetIntegerv(GL_PACK_ALIGNMENT, &a);
} else if (mode == gl_pixelbuffer_unpack) {
glGetIntegerv(GL_UNPACK_ROW_LENGTH, &l);
glGetIntegerv(GL_UNPACK_ALIGNMENT, &a);
}
s = gl_type_size(type);
n = gl_component_count(format, type);
/* From Mesa, more or less */
if (type == GL_BITMAP) {
k = a * CEILING( n * l, 8 * a);
} else {
k = l * s * n;
if ( s < a ) {
k = (a / s * CEILING(k, a)) * s;
}
}
*items = l * n * height * depth;
*length = (k * height * depth);
}
void pgl_set_type(SV * sv, GLenum type, void ** ptr)
{
#define RIV(t) \
(*(t*)*ptr) = (t)SvIV(sv); \
*(unsigned char**)ptr += sizeof(t);\
break;
#define RNV(t) \
(*(t*)*ptr) = (t)SvNV(sv); \
*(unsigned char**)ptr += sizeof(t);\
break;
switch (type) {
#ifdef GL_VERSION_1_2
case GL_UNSIGNED_BYTE_3_3_2:
case GL_UNSIGNED_BYTE_2_3_3_REV:
RIV(GLubyte)
case GL_UNSIGNED_SHORT_5_6_5:
case GL_UNSIGNED_SHORT_5_6_5_REV:
case GL_UNSIGNED_SHORT_4_4_4_4:
case GL_UNSIGNED_SHORT_4_4_4_4_REV:
case GL_UNSIGNED_SHORT_5_5_5_1:
case GL_UNSIGNED_SHORT_1_5_5_5_REV:
RIV(GLushort)
case GL_UNSIGNED_INT_8_8_8_8:
case GL_UNSIGNED_INT_8_8_8_8_REV:
case GL_UNSIGNED_INT_10_10_10_2:
case GL_UNSIGNED_INT_2_10_10_10_REV:
RIV(GLuint)
#endif
case GL_UNSIGNED_BYTE:
case GL_BITMAP:
case GL_BYTE:
RIV(GLubyte)
case GL_UNSIGNED_SHORT:
case GL_SHORT:
RIV(GLushort)
case GL_UNSIGNED_INT:
case GL_INT:
RIV(GLuint)
case GL_FLOAT:
RNV(GLfloat)
case GL_DOUBLE:
RNV(GLdouble)
case GL_2_BYTES:
{
unsigned long v = SvIV(sv);
(*(GLubyte*)*ptr) = (GLubyte)(v >> 8);
(*(unsigned char**)ptr)++;
(*(GLubyte*)*ptr) = (GLubyte)(v & 0xff);
(*(unsigned char**)ptr)++;
break;
}
case GL_3_BYTES:
{
unsigned long v = SvIV(sv);
(*(GLubyte*)*ptr) = (GLubyte)((v >> 16) & 0xff);
(*(unsigned char**)ptr)++;
(*(GLubyte*)*ptr) = (GLubyte)((v >> 8) & 0xff);
(*(unsigned char**)ptr)++;
(*(GLubyte*)*ptr) = (GLubyte)((v >> 0) & 0xff);
(*(unsigned char**)ptr)++;
break;
}
case GL_4_BYTES:
{
unsigned long v = SvIV(sv);
(*(GLubyte*)*ptr) = (GLubyte)((v >> 24) & 0xff);
(*(unsigned char**)ptr)++;
(*(GLubyte*)*ptr) = (GLubyte)((v >> 16) & 0xff);
(*(unsigned char**)ptr)++;
(*(GLubyte*)*ptr) = (GLubyte)((v >> 8) & 0xff);
(*(unsigned char**)ptr)++;
(*(GLubyte*)*ptr) = (GLubyte)((v >> 0) & 0xff);
(*ptr)++;
break;
}
default:
croak("Unable to set data with unknown type");
}
#undef RIV
#undef RNV
}
SV * pgl_get_type(GLenum type, void ** ptr)
{
SV * result = 0;
#define RIV(t) \
result = newSViv((*(t*)*ptr)); \
*(unsigned char**)ptr += sizeof(t); \
break;