/*
* Solve plane and return clamped GLchan value.
*/
static inline GLchan
solve_plane_chan(GLfloat x, GLfloat y, const GLfloat plane[4])
{
const GLfloat z = (plane[3] + plane[0] * x + plane[1] * y) / -plane[2];
#if CHAN_TYPE == GL_FLOAT
return CLAMP(z, 0.0F, CHAN_MAXF);
#else
if (z < 0)
return 0;
else if (z > CHAN_MAX)
return CHAN_MAX;
return (GLchan) IROUND_POS(z);
#endif
}
void GLAPIENTRY
_mesa_GetColorTable( GLenum target, GLenum format,
GLenum type, GLvoid *data )
{
GET_CURRENT_CONTEXT(ctx);
struct gl_texture_unit *texUnit = &ctx->Texture.Unit[ctx->Texture.CurrentUnit];
struct gl_color_table *table = NULL;
GLchan rgba[MAX_COLOR_TABLE_SIZE][4];
ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
if (ctx->NewState) {
_mesa_update_state(ctx);
}
switch (target) {
case GL_TEXTURE_1D:
table = &texUnit->Current1D->Palette;
break;
case GL_TEXTURE_2D:
table = &texUnit->Current2D->Palette;
break;
case GL_TEXTURE_3D:
table = &texUnit->Current3D->Palette;
break;
case GL_TEXTURE_CUBE_MAP_ARB:
if (!ctx->Extensions.ARB_texture_cube_map) {
_mesa_error(ctx, GL_INVALID_ENUM, "glGetColorTable(target)");
return;
}
table = &texUnit->CurrentCubeMap->Palette;
break;
case GL_SHARED_TEXTURE_PALETTE_EXT:
table = &ctx->Texture.Palette;
break;
case GL_COLOR_TABLE:
table = &ctx->ColorTable;
break;
case GL_TEXTURE_COLOR_TABLE_SGI:
if (!ctx->Extensions.SGI_texture_color_table) {
_mesa_error(ctx, GL_INVALID_ENUM, "glGetColorTable(target)");
return;
}
table = &(texUnit->ColorTable);
break;
case GL_POST_CONVOLUTION_COLOR_TABLE:
table = &ctx->PostConvolutionColorTable;
break;
case GL_POST_COLOR_MATRIX_COLOR_TABLE:
table = &ctx->PostColorMatrixColorTable;
break;
default:
_mesa_error(ctx, GL_INVALID_ENUM, "glGetColorTable(target)");
return;
}
ASSERT(table);
switch (table->Format) {
case GL_ALPHA:
if (table->Type == GL_FLOAT) {
const GLfloat *tableF = (const GLfloat *) table->Table;
GLuint i;
for (i = 0; i < table->Size; i++) {
rgba[i][RCOMP] = 0;
rgba[i][GCOMP] = 0;
rgba[i][BCOMP] = 0;
rgba[i][ACOMP] = IROUND_POS(tableF[i] * CHAN_MAXF);
}
}
else {
const GLchan *tableUB = (const GLchan *) table->Table;
GLuint i;
for (i = 0; i < table->Size; i++) {
rgba[i][RCOMP] = 0;
rgba[i][GCOMP] = 0;
rgba[i][BCOMP] = 0;
rgba[i][ACOMP] = tableUB[i];
}
}
break;
case GL_LUMINANCE:
if (table->Type == GL_FLOAT) {
const GLfloat *tableF = (const GLfloat *) table->Table;
GLuint i;
for (i = 0; i < table->Size; i++) {
rgba[i][RCOMP] = IROUND_POS(tableF[i] * CHAN_MAXF);
rgba[i][GCOMP] = IROUND_POS(tableF[i] * CHAN_MAXF);
rgba[i][BCOMP] = IROUND_POS(tableF[i] * CHAN_MAXF);
rgba[i][ACOMP] = CHAN_MAX;
}
}
else {
const GLchan *tableUB = (const GLchan *) table->Table;
GLuint i;
for (i = 0; i < table->Size; i++) {
rgba[i][RCOMP] = tableUB[i];
rgba[i][GCOMP] = tableUB[i];
rgba[i][BCOMP] = tableUB[i];
rgba[i][ACOMP] = CHAN_MAX;
}
}
break;
case GL_LUMINANCE_ALPHA:
if (table->Type == GL_FLOAT) {
const GLfloat *tableF = (const GLfloat *) table->Table;
GLuint i;
for (i = 0; i < table->Size; i++) {
rgba[i][RCOMP] = IROUND_POS(tableF[i*2+0] * CHAN_MAXF);
rgba[i][GCOMP] = IROUND_POS(tableF[i*2+0] * CHAN_MAXF);
rgba[i][BCOMP] = IROUND_POS(tableF[i*2+0] * CHAN_MAXF);
rgba[i][ACOMP] = IROUND_POS(tableF[i*2+1] * CHAN_MAXF);
}
}
else {
const GLchan *tableUB = (const GLchan *) table->Table;
GLuint i;
for (i = 0; i < table->Size; i++) {
rgba[i][RCOMP] = tableUB[i*2+0];
rgba[i][GCOMP] = tableUB[i*2+0];
rgba[i][BCOMP] = tableUB[i*2+0];
rgba[i][ACOMP] = tableUB[i*2+1];
}
}
break;
case GL_INTENSITY:
if (table->Type == GL_FLOAT) {
const GLfloat *tableF = (const GLfloat *) table->Table;
GLuint i;
for (i = 0; i < table->Size; i++) {
rgba[i][RCOMP] = IROUND_POS(tableF[i] * CHAN_MAXF);
rgba[i][GCOMP] = IROUND_POS(tableF[i] * CHAN_MAXF);
rgba[i][BCOMP] = IROUND_POS(tableF[i] * CHAN_MAXF);
rgba[i][ACOMP] = IROUND_POS(tableF[i] * CHAN_MAXF);
}
}
else {
const GLchan *tableUB = (const GLchan *) table->Table;
GLuint i;
for (i = 0; i < table->Size; i++) {
rgba[i][RCOMP] = tableUB[i];
rgba[i][GCOMP] = tableUB[i];
rgba[i][BCOMP] = tableUB[i];
rgba[i][ACOMP] = tableUB[i];
}
}
break;
case GL_RGB:
if (table->Type == GL_FLOAT) {
const GLfloat *tableF = (const GLfloat *) table->Table;
GLuint i;
for (i = 0; i < table->Size; i++) {
rgba[i][RCOMP] = IROUND_POS(tableF[i*3+0] * CHAN_MAXF);
rgba[i][GCOMP] = IROUND_POS(tableF[i*3+1] * CHAN_MAXF);
rgba[i][BCOMP] = IROUND_POS(tableF[i*3+2] * CHAN_MAXF);
rgba[i][ACOMP] = CHAN_MAX;
}
}
else {
const GLchan *tableUB = (const GLchan *) table->Table;
GLuint i;
for (i = 0; i < table->Size; i++) {
rgba[i][RCOMP] = tableUB[i*3+0];
rgba[i][GCOMP] = tableUB[i*3+1];
rgba[i][BCOMP] = tableUB[i*3+2];
rgba[i][ACOMP] = CHAN_MAX;
}
}
break;
case GL_RGBA:
if (table->Type == GL_FLOAT) {
const GLfloat *tableF = (const GLfloat *) table->Table;
GLuint i;
for (i = 0; i < table->Size; i++) {
rgba[i][RCOMP] = IROUND_POS(tableF[i*4+0] * CHAN_MAXF);
rgba[i][GCOMP] = IROUND_POS(tableF[i*4+1] * CHAN_MAXF);
rgba[i][BCOMP] = IROUND_POS(tableF[i*4+2] * CHAN_MAXF);
rgba[i][ACOMP] = IROUND_POS(tableF[i*4+3] * CHAN_MAXF);
}
}
else {
const GLchan *tableUB = (const GLchan *) table->Table;
GLuint i;
for (i = 0; i < table->Size; i++) {
rgba[i][RCOMP] = tableUB[i*4+0];
rgba[i][GCOMP] = tableUB[i*4+1];
rgba[i][BCOMP] = tableUB[i*4+2];
rgba[i][ACOMP] = tableUB[i*4+3];
}
}
break;
default:
_mesa_problem(ctx, "bad table format in glGetColorTable");
return;
}
if (ctx->Pack.BufferObj->Name) {
/* pack color table into PBO */
GLubyte *buf;
if (!_mesa_validate_pbo_access(1, &ctx->Pack, table->Size, 1, 1,
format, type, data)) {
_mesa_error(ctx, GL_INVALID_OPERATION,
"glGetColorTable(invalid PBO access)");
return;
}
buf = (GLubyte *) ctx->Driver.MapBuffer(ctx, GL_PIXEL_PACK_BUFFER_EXT,
GL_WRITE_ONLY_ARB,
ctx->Pack.BufferObj);
if (!buf) {
/* buffer is already mapped - that's an error */
_mesa_error(ctx, GL_INVALID_OPERATION,
"glGetColorTable(PBO is mapped)");
return;
}
data = ADD_POINTERS(buf, data);
}
_mesa_pack_rgba_span_chan(ctx, table->Size, (const GLchan (*)[4]) rgba,
format, type, data, &ctx->Pack, GL_FALSE);
if (ctx->Pack.BufferObj->Name) {
ctx->Driver.UnmapBuffer(ctx, GL_PIXEL_PACK_BUFFER_EXT,
ctx->Pack.BufferObj);
}
}
