-/**
- * \file rastpos.c
- * Raster position operations.
- */
-
/*
* Mesa 3-D graphics library
- * Version: 5.1
+ * Version: 6.1
*
- * Copyright (C) 1999-2003 Brian Paul All Rights Reserved.
+ * Copyright (C) 1999-2004 Brian Paul All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
*/
+/**
+ * \file rastpos.c
+ * Raster position operations.
+ */
+
#include "glheader.h"
-/*#include "clip.h"*/
#include "colormac.h"
#include "context.h"
#include "feedback.h"
}
+/**
+ * Do texgen needed for glRasterPos.
+ * \param ctx rendering context
+ * \param vObj object-space vertex coordinate
+ * \param vEye eye-space vertex coordinate
+ * \param normal vertex normal
+ * \param unit texture unit number
+ * \param texcoord incoming texcoord and resulting texcoord
+ */
+static void
+compute_texgen(GLcontext *ctx, const GLfloat vObj[4], const GLfloat vEye[4],
+ const GLfloat normal[3], GLuint unit, GLfloat texcoord[4])
+{
+ const struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
+
+ /* always compute sphere map terms, just in case */
+ GLfloat u[3], two_nu, rx, ry, rz, m, mInv;
+ COPY_3V(u, vEye);
+ NORMALIZE_3FV(u);
+ two_nu = 2.0F * DOT3(normal, u);
+ rx = u[0] - normal[0] * two_nu;
+ ry = u[1] - normal[1] * two_nu;
+ rz = u[2] - normal[2] * two_nu;
+ m = rx * rx + ry * ry + (rz + 1.0F) * (rz + 1.0F);
+ if (m > 0.0F)
+ mInv = 0.5F * _mesa_inv_sqrtf(m);
+ else
+ mInv = 0.0F;
+
+ if (texUnit->TexGenEnabled & S_BIT) {
+ switch (texUnit->GenModeS) {
+ case GL_OBJECT_LINEAR:
+ texcoord[0] = DOT4(vObj, texUnit->ObjectPlaneS);
+ break;
+ case GL_EYE_LINEAR:
+ texcoord[0] = DOT4(vEye, texUnit->EyePlaneS);
+ break;
+ case GL_SPHERE_MAP:
+ texcoord[0] = rx * mInv + 0.5F;
+ break;
+ case GL_REFLECTION_MAP:
+ texcoord[0] = rx;
+ break;
+ case GL_NORMAL_MAP:
+ texcoord[0] = normal[0];
+ break;
+ default:
+ _mesa_problem(ctx, "Bad S texgen in compute_texgen()");
+ return;
+ }
+ }
+
+ if (texUnit->TexGenEnabled & T_BIT) {
+ switch (texUnit->GenModeT) {
+ case GL_OBJECT_LINEAR:
+ texcoord[1] = DOT4(vObj, texUnit->ObjectPlaneT);
+ break;
+ case GL_EYE_LINEAR:
+ texcoord[1] = DOT4(vEye, texUnit->EyePlaneT);
+ break;
+ case GL_SPHERE_MAP:
+ texcoord[1] = ry * mInv + 0.5F;
+ break;
+ case GL_REFLECTION_MAP:
+ texcoord[1] = ry;
+ break;
+ case GL_NORMAL_MAP:
+ texcoord[1] = normal[1];
+ break;
+ default:
+ _mesa_problem(ctx, "Bad T texgen in compute_texgen()");
+ return;
+ }
+ }
+
+ if (texUnit->TexGenEnabled & R_BIT) {
+ switch (texUnit->GenModeR) {
+ case GL_OBJECT_LINEAR:
+ texcoord[2] = DOT4(vObj, texUnit->ObjectPlaneR);
+ break;
+ case GL_EYE_LINEAR:
+ texcoord[2] = DOT4(vEye, texUnit->EyePlaneR);
+ break;
+ case GL_REFLECTION_MAP:
+ texcoord[2] = rz;
+ break;
+ case GL_NORMAL_MAP:
+ texcoord[2] = normal[2];
+ break;
+ default:
+ _mesa_problem(ctx, "Bad R texgen in compute_texgen()");
+ return;
+ }
+ }
+
+ if (texUnit->TexGenEnabled & Q_BIT) {
+ switch (texUnit->GenModeQ) {
+ case GL_OBJECT_LINEAR:
+ texcoord[3] = DOT4(vObj, texUnit->ObjectPlaneQ);
+ break;
+ case GL_EYE_LINEAR:
+ texcoord[3] = DOT4(vEye, texUnit->EyePlaneQ);
+ break;
+ default:
+ _mesa_problem(ctx, "Bad Q texgen in compute_texgen()");
+ return;
+ }
+ }
+}
+
+
+
/**
* Set the raster position for pixel operations.
*
static void
raster_pos4f(GLcontext *ctx, GLfloat x, GLfloat y, GLfloat z, GLfloat w)
{
- GLfloat v[4], eye[4], clip[4], ndc[3], d;
ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
FLUSH_CURRENT(ctx, 0);
return;
}
else {
- ASSIGN_4V( v, x, y, z, w );
- TRANSFORM_POINT( eye, ctx->ModelviewMatrixStack.Top->m, v );
-
- /* raster color */
- if (ctx->Light.Enabled) {
- GLfloat *norm, eyenorm[3];
- GLfloat *objnorm = ctx->Current.Attrib[VERT_ATTRIB_NORMAL];
-
- if (ctx->_NeedEyeCoords) {
- GLfloat *inv = ctx->ModelviewMatrixStack.Top->inv;
- TRANSFORM_NORMAL( eyenorm, objnorm, inv );
- norm = eyenorm;
- }
- else {
- norm = objnorm;
- }
-
- shade_rastpos( ctx, v, norm,
- ctx->Current.RasterColor,
- ctx->Current.RasterSecondaryColor,
- &ctx->Current.RasterIndex );
- }
- else {
- /* use current color or index */
- if (ctx->Visual.rgbMode) {
- COPY_4FV(ctx->Current.RasterColor,
- ctx->Current.Attrib[VERT_ATTRIB_COLOR0]);
- COPY_4FV(ctx->Current.RasterSecondaryColor,
- ctx->Current.Attrib[VERT_ATTRIB_COLOR1]);
- }
- else {
- ctx->Current.RasterIndex = ctx->Current.Index;
- }
- }
-
- /* compute raster distance */
- if (ctx->Fog.FogCoordinateSource == GL_FOG_COORDINATE_EXT)
- ctx->Current.RasterDistance = ctx->Current.Attrib[VERT_ATTRIB_FOG][0];
- else
- ctx->Current.RasterDistance =
- SQRTF( eye[0]*eye[0] + eye[1]*eye[1] + eye[2]*eye[2] );
+ GLfloat obj[4], eye[4], clip[4], ndc[3], d;
+ GLfloat *norm, eyenorm[3];
+ GLfloat *objnorm = ctx->Current.Attrib[VERT_ATTRIB_NORMAL];
+ ASSIGN_4V( obj, x, y, z, w );
+ /* apply modelview matrix: eye = MV * obj */
+ TRANSFORM_POINT( eye, ctx->ModelviewMatrixStack.Top->m, obj );
/* apply projection matrix: clip = Proj * eye */
TRANSFORM_POINT( clip, ctx->ProjectionMatrixStack.Top->m, eye );
ndc[0] = clip[0] * d;
ndc[1] = clip[1] * d;
ndc[2] = clip[2] * d;
-
- ctx->Current.RasterPos[0] = (ndc[0] * ctx->Viewport._WindowMap.m[MAT_SX] +
- ctx->Viewport._WindowMap.m[MAT_TX]);
- ctx->Current.RasterPos[1] = (ndc[1] * ctx->Viewport._WindowMap.m[MAT_SY] +
- ctx->Viewport._WindowMap.m[MAT_TY]);
- ctx->Current.RasterPos[2] = (ndc[2] * ctx->Viewport._WindowMap.m[MAT_SZ] +
- ctx->Viewport._WindowMap.m[MAT_TZ]) / ctx->DepthMaxF;
+ /* wincoord = viewport_mapping(ndc) */
+ ctx->Current.RasterPos[0] = (ndc[0] * ctx->Viewport._WindowMap.m[MAT_SX]
+ + ctx->Viewport._WindowMap.m[MAT_TX]);
+ ctx->Current.RasterPos[1] = (ndc[1] * ctx->Viewport._WindowMap.m[MAT_SY]
+ + ctx->Viewport._WindowMap.m[MAT_TY]);
+ ctx->Current.RasterPos[2] = (ndc[2] * ctx->Viewport._WindowMap.m[MAT_SZ]
+ + ctx->Viewport._WindowMap.m[MAT_TZ])
+ / ctx->DepthMaxF;
ctx->Current.RasterPos[3] = clip[3];
- ctx->Current.RasterPosValid = GL_TRUE;
+ /* compute raster distance */
+ if (ctx->Fog.FogCoordinateSource == GL_FOG_COORDINATE_EXT)
+ ctx->Current.RasterDistance = ctx->Current.Attrib[VERT_ATTRIB_FOG][0];
+ else
+ ctx->Current.RasterDistance =
+ SQRTF( eye[0]*eye[0] + eye[1]*eye[1] + eye[2]*eye[2] );
+
+ /* compute transformed normal vector (for lighting or texgen) */
+ if (ctx->_NeedEyeCoords) {
+ const GLfloat *inv = ctx->ModelviewMatrixStack.Top->inv;
+ TRANSFORM_NORMAL( eyenorm, objnorm, inv );
+ norm = eyenorm;
+ }
+ else {
+ norm = objnorm;
+ }
+
+ /* update raster color */
+ if (ctx->Light.Enabled) {
+ /* lighting */
+ shade_rastpos( ctx, obj, norm,
+ ctx->Current.RasterColor,
+ ctx->Current.RasterSecondaryColor,
+ &ctx->Current.RasterIndex );
+ }
+ else {
+ /* use current color or index */
+ if (ctx->Visual.rgbMode) {
+ COPY_4FV(ctx->Current.RasterColor,
+ ctx->Current.Attrib[VERT_ATTRIB_COLOR0]);
+ COPY_4FV(ctx->Current.RasterSecondaryColor,
+ ctx->Current.Attrib[VERT_ATTRIB_COLOR1]);
+ }
+ else {
+ ctx->Current.RasterIndex = ctx->Current.Index;
+ }
+ }
+
+ /* texture coords */
{
- GLuint texSet;
- for (texSet = 0; texSet < ctx->Const.MaxTextureCoordUnits; texSet++) {
- COPY_4FV( ctx->Current.RasterTexCoords[texSet],
- ctx->Current.Attrib[VERT_ATTRIB_TEX0 + texSet] );
+ GLuint u;
+ for (u = 0; u < ctx->Const.MaxTextureCoordUnits; u++) {
+ GLfloat tc[4];
+ COPY_4V(tc, ctx->Current.Attrib[VERT_ATTRIB_TEX0 + u]);
+ if (ctx->Texture.Unit[u].TexGenEnabled) {
+ compute_texgen(ctx, obj, eye, norm, u, tc);
+ }
+ TRANSFORM_POINT(ctx->Current.RasterTexCoords[u],
+ ctx->TextureMatrixStack[u].Top->m, tc);
}
}
+ ctx->Current.RasterPosValid = GL_TRUE;
}
- if (ctx->RenderMode==GL_SELECT) {
+ if (ctx->RenderMode == GL_SELECT) {
_mesa_update_hitflag( ctx, ctx->Current.RasterPos[2] );
}
}
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