texture.h File Reference

#include "types.h"

Include dependency graph for texture.h:

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Go to the source code of this file.

Functions
void	gl_texgen (GLcontext *ctx, GLint n, GLfloat obj[][4], GLfloat eye[][4], GLfloat normal[][3], GLfloat texcoord[][4])
void	gl_set_texture_sampler (struct gl_texture_object *t)
void	gl_texture_pixels (GLcontext *ctx, GLuint n, const GLfloat s[], const GLfloat t[], const GLfloat r[], const GLfloat lambda[], GLubyte red[], GLubyte green[], GLubyte blue[], GLubyte alpha[])

Function Documentation

gl_set_texture_sampler()

void gl_set_texture_sampler

(

struct gl_texture_object *

t

)

Definition at line 1319 of file texture.c.

{
   if (!t->Complete) {
      t->SampleFunc = NULL;
   }
   else {
      GLboolean needLambda = (t->MinFilter != t->MagFilter);
 
      if (needLambda) {
         /* Compute min/mag filter threshold */
         if (t->MagFilter==GL_LINEAR
             && (t->MinFilter==GL_NEAREST_MIPMAP_NEAREST ||
                 t->MinFilter==GL_LINEAR_MIPMAP_NEAREST)) {
            t->MinMagThresh = 0.5F;
         }
         else {
            t->MinMagThresh = 0.0F;
         }
      }
 
      switch (t->Dimensions) {
         case 1:
            if (needLambda) {
               t->SampleFunc = sample_lambda_1d;
            }
            else if (t->MinFilter==GL_LINEAR) {
               t->SampleFunc = sample_linear_1d;
            }
            else {
               ASSERT(t->MinFilter==GL_NEAREST);
               t->SampleFunc = sample_nearest_1d;
            }
            break;
         case 2:
            if (needLambda) {
               t->SampleFunc = sample_lambda_2d;
            }
            else if (t->MinFilter==GL_LINEAR) {
               t->SampleFunc = sample_linear_2d;
            }
            else {
               ASSERT(t->MinFilter==GL_NEAREST);
               if (t->WrapS==GL_REPEAT && t->WrapT==GL_REPEAT
                   && t->Image[0]->Border==0 && t->Image[0]->Format==GL_RGB) {
                  t->SampleFunc = opt_sample_rgb_2d;
               }
               else if (t->WrapS==GL_REPEAT && t->WrapT==GL_REPEAT
                   && t->Image[0]->Border==0 && t->Image[0]->Format==GL_RGBA) {
                  t->SampleFunc = opt_sample_rgba_2d;
               }
               else
                  t->SampleFunc = sample_nearest_2d;
            }
            break;
         default:
            gl_problem(NULL, "invalid dimensions in gl_set_texture_sampler");
      }
   }
}

Referenced by gl_update_texture_state().

gl_texgen()

void gl_texgen	(	GLcontext *	ctx,
		GLint	n,
		GLfloat	obj[][4],
		GLfloat	eye[][4],
		GLfloat	normal[][3],
		GLfloat	texcoord[][4]
	)

Definition at line 163 of file texture.c.

{
   /* special case: S and T sphere mapping */
   if (ctx->Texture.TexGenEnabled==(S_BIT|T_BIT)
       && ctx->Texture.GenModeS==GL_SPHERE_MAP
       && ctx->Texture.GenModeT==GL_SPHERE_MAP) {
      GLint i;
      for (i=0;i<n;i++) {
         GLfloat u[3], two_nu, m, fx, fy, fz;
         COPY_3V( u, eye[i] );
         NORMALIZE_3FV( u );
         two_nu = 2.0F * DOT3(normal[i],u);
         fx = u[0] - normal[i][0] * two_nu;
         fy = u[1] - normal[i][1] * two_nu;
         fz = u[2] - normal[i][2] * two_nu;
         m = 2.0F * GL_SQRT( fx*fx + fy*fy + (fz+1.0F)*(fz+1.0F) );
         if (m==0.0F) {
            texcoord[i][0] = 0.5F;
            texcoord[i][1] = 0.5F;
         }
         else {
            GLfloat mInv = 1.0F / m;
            texcoord[i][0] = fx * mInv + 0.5F;
            texcoord[i][1] = fy * mInv + 0.5F;
         }
      }
      return;
   }
 
   /* general solution */
   if (ctx->Texture.TexGenEnabled & S_BIT) {
      GLint i;
      switch (ctx->Texture.GenModeS) {
         case GL_OBJECT_LINEAR:
            for (i=0;i<n;i++) {
               texcoord[i][0] = DOT4( obj[i], ctx->Texture.ObjectPlaneS );
            }
            break;
         case GL_EYE_LINEAR:
            for (i=0;i<n;i++) {
               texcoord[i][0] = DOT4( eye[i], ctx->Texture.EyePlaneS );
            }
            break;
         case GL_SPHERE_MAP:
            for (i=0;i<n;i++) {
               GLfloat u[3], two_nu, m, fx, fy, fz;
               COPY_3V( u, eye[i] );
               NORMALIZE_3FV( u );
               two_nu = 2.0*DOT3(normal[i],u);
               fx = u[0] - normal[i][0] * two_nu;
               fy = u[1] - normal[i][1] * two_nu;
               fz = u[2] - normal[i][2] * two_nu;
               m = 2.0F * GL_SQRT( fx*fx + fy*fy + (fz+1.0)*(fz+1.0) );
               if (m==0.0F) {
                  texcoord[i][0] = 0.5F;
               }
               else {
                  texcoord[i][0] = fx / m + 0.5F;
               }
            }
            break;
         default:
            gl_problem(ctx, "Bad S texgen");
            return;
      }
   }
 
   if (ctx->Texture.TexGenEnabled & T_BIT) {
      GLint i;
      switch (ctx->Texture.GenModeT) {
         case GL_OBJECT_LINEAR:
            for (i=0;i<n;i++) {
               texcoord[i][1] = DOT4( obj[i], ctx->Texture.ObjectPlaneT );
            }
            break;
         case GL_EYE_LINEAR:
            for (i=0;i<n;i++) {
               texcoord[i][1] = DOT4( eye[i], ctx->Texture.EyePlaneT );
            }
            break;
         case GL_SPHERE_MAP:
            for (i=0;i<n;i++) {
               GLfloat u[3], two_nu, m, fx, fy, fz;
               COPY_3V( u, eye[i] );
               NORMALIZE_3FV( u );
               two_nu = 2.0*DOT3(normal[i],u);
               fx = u[0] - normal[i][0] * two_nu;
               fy = u[1] - normal[i][1] * two_nu;
               fz = u[2] - normal[i][2] * two_nu;
               m = 2.0F * GL_SQRT( fx*fx + fy*fy + (fz+1.0)*(fz+1.0) );
               if (m==0.0F) {
                  texcoord[i][1] = 0.5F;
               }
               else {
                  texcoord[i][1] = fy / m + 0.5F;
               }
            }
            break;
         default:
            gl_problem(ctx, "Bad T texgen");
            return;
      }
   }
 
   if (ctx->Texture.TexGenEnabled & R_BIT) {
      GLint i;
      switch (ctx->Texture.GenModeR) {
         case GL_OBJECT_LINEAR:
            for (i=0;i<n;i++) {
               texcoord[i][2] = DOT4( obj[i], ctx->Texture.ObjectPlaneR );
            }
            break;
         case GL_EYE_LINEAR:
            for (i=0;i<n;i++) {
               texcoord[i][2] = DOT4( eye[i], ctx->Texture.EyePlaneR );
            }
            break;
         default:
            gl_problem(ctx, "Bad R texgen");
            return;
      }
   }
 
   if (ctx->Texture.TexGenEnabled & Q_BIT) {
      GLint i;
      switch (ctx->Texture.GenModeQ) {
         case GL_OBJECT_LINEAR:
            for (i=0;i<n;i++) {
               texcoord[i][3] = DOT4( obj[i], ctx->Texture.ObjectPlaneQ );
            }
            break;
         case GL_EYE_LINEAR:
            for (i=0;i<n;i++) {
               texcoord[i][3] = DOT4( eye[i], ctx->Texture.EyePlaneQ );
            }
            break;
         default:
            gl_problem(ctx, "Bad Q texgen");
            return;
      }
   }
}

Referenced by gl_transform_vb_part2().

gl_texture_pixels()

void gl_texture_pixels	(	GLcontext *	ctx,
		GLuint	n,
		const GLfloat	s[],
		const GLfloat	t[],
		const GLfloat	r[],
		const GLfloat	lambda[],
		GLubyte	red[],
		GLubyte	green[],
		GLubyte	blue[],
		GLubyte	alpha[]
	)

Definition at line 1678 of file texture.c.

{
   GLubyte tred[PB_SIZE];
   GLubyte tgreen[PB_SIZE];
   GLubyte tblue[PB_SIZE];
   GLubyte talpha[PB_SIZE];
 
   if (!ctx->Texture.Current || !ctx->Texture.Current->SampleFunc)
      return;
 
   /* Sample the texture. */
   (*ctx->Texture.Current->SampleFunc)( ctx->Texture.Current, n,
                                        s, t, r, lambda,
                                        tred, tgreen, tblue, talpha );
 
   apply_texture( ctx, n,
                  ctx->Texture.Current->Image[0]->Format,
                  ctx->Texture.EnvMode,
                  red, green, blue, alpha,
                  tred, tgreen, tblue, talpha );
}

Referenced by gl_flush_pb(), and gl_write_texture_span().