* optimization! If we find that's not true on some systems, convert
* to a macro.
*/
-static INLINE GLfloat
+static inline GLfloat
lerp_2d(GLfloat a, GLfloat b,
GLfloat v00, GLfloat v10, GLfloat v01, GLfloat v11)
{
* Do 3D/trilinear interpolation of float values.
* \sa lerp_2d
*/
-static INLINE GLfloat
+static inline GLfloat
lerp_3d(GLfloat a, GLfloat b, GLfloat c,
GLfloat v000, GLfloat v100, GLfloat v010, GLfloat v110,
GLfloat v001, GLfloat v101, GLfloat v011, GLfloat v111)
/**
* Do linear interpolation of colors.
*/
-static INLINE void
+static inline void
lerp_rgba(GLfloat result[4], GLfloat t, const GLfloat a[4], const GLfloat b[4])
{
result[0] = LERP(t, a[0], b[0]);
/**
* Do bilinear interpolation of colors.
*/
-static INLINE void
+static inline void
lerp_rgba_2d(GLfloat result[4], GLfloat a, GLfloat b,
const GLfloat t00[4], const GLfloat t10[4],
const GLfloat t01[4], const GLfloat t11[4])
/**
* Do trilinear interpolation of colors.
*/
-static INLINE void
+static inline void
lerp_rgba_3d(GLfloat result[4], GLfloat a, GLfloat b, GLfloat c,
const GLfloat t000[4], const GLfloat t100[4],
const GLfloat t010[4], const GLfloat t110[4],
* i0, i1 = returns two nearest texel indexes
* weight = returns blend factor between texels
*/
-static INLINE void
+static inline void
linear_texel_locations(GLenum wrapMode,
const struct gl_texture_image *img,
GLint size, GLfloat s,
GLint *i0, GLint *i1, GLfloat *weight)
{
+ const struct swrast_texture_image *swImg = swrast_texture_image_const(img);
GLfloat u;
switch (wrapMode) {
case GL_REPEAT:
u = s * size - 0.5F;
- if (img->_IsPowerOfTwo) {
+ if (swImg->_IsPowerOfTwo) {
*i0 = IFLOOR(u) & (size - 1);
*i1 = (*i0 + 1) & (size - 1);
}
/**
* Used to compute texel location for nearest sampling.
*/
-static INLINE GLint
+static inline GLint
nearest_texel_location(GLenum wrapMode,
const struct gl_texture_image *img,
GLint size, GLfloat s)
{
+ const struct swrast_texture_image *swImg = swrast_texture_image_const(img);
GLint i;
switch (wrapMode) {
/* s limited to [0,1) */
/* i limited to [0,size-1] */
i = IFLOOR(s * size);
- if (img->_IsPowerOfTwo)
+ if (swImg->_IsPowerOfTwo)
i &= (size - 1);
else
i = REMAINDER(i, size);
/* Power of two image sizes only */
-static INLINE void
+static inline void
linear_repeat_texel_location(GLuint size, GLfloat s,
GLint *i0, GLint *i1, GLfloat *weight)
{
/**
* Do clamp/wrap for a texture rectangle coord, GL_NEAREST filter mode.
*/
-static INLINE GLint
+static inline GLint
clamp_rect_coord_nearest(GLenum wrapMode, GLfloat coord, GLint max)
{
switch (wrapMode) {
/**
* As above, but GL_LINEAR filtering.
*/
-static INLINE void
+static inline void
clamp_rect_coord_linear(GLenum wrapMode, GLfloat coord, GLint max,
GLint *i0out, GLint *i1out, GLfloat *weight)
{
/**
* Compute slice/image to use for 1D or 2D array texture.
*/
-static INLINE GLint
+static inline GLint
tex_array_slice(GLfloat coord, GLsizei size)
{
GLint slice = IFLOOR(coord + 0.5f);
* Compute nearest integer texcoords for given texobj and coordinate.
* NOTE: only used for depth texture sampling.
*/
-static INLINE void
+static inline void
nearest_texcoord(const struct gl_texture_object *texObj,
GLuint level,
const GLfloat texcoord[4],
* Compute linear integer texcoords for given texobj and coordinate.
* NOTE: only used for depth texture sampling.
*/
-static INLINE void
+static inline void
linear_texcoord(const struct gl_texture_object *texObj,
GLuint level,
const GLfloat texcoord[4],
* For linear interpolation between mipmap levels N and N+1, this function
* computes N.
*/
-static INLINE GLint
+static inline GLint
linear_mipmap_level(const struct gl_texture_object *tObj, GLfloat lambda)
{
if (lambda < 0.0F)
/**
* Compute the nearest mipmap level to take texels from.
*/
-static INLINE GLint
+static inline GLint
nearest_mipmap_level(const struct gl_texture_object *tObj, GLfloat lambda)
{
GLfloat l;
* will be minified, magnified, or split between the two. This function
* determines the subranges in [0, n-1] that are to be minified or magnified.
*/
-static INLINE void
+static inline void
compute_min_mag_ranges(const struct gl_texture_object *tObj,
GLuint n, const GLfloat lambda[],
GLuint *minStart, GLuint *minEnd,
* the base texture format. Ex: if the texture base format it GL_ALPHA,
* we return (0,0,0,BorderAlpha).
*/
-static INLINE void
+static inline void
get_border_color(const struct gl_texture_object *tObj,
const struct gl_texture_image *img,
GLfloat rgba[4])
/**
* Return the texture sample for coordinate (s) using GL_NEAREST filter.
*/
-static INLINE void
+static inline void
sample_1d_nearest(struct gl_context *ctx,
const struct gl_texture_object *tObj,
const struct gl_texture_image *img,
const GLfloat texcoord[4], GLfloat rgba[4])
{
+ const struct swrast_texture_image *swImg = swrast_texture_image_const(img);
const GLint width = img->Width2; /* without border, power of two */
GLint i;
i = nearest_texel_location(tObj->Sampler.WrapS, img, width, texcoord[0]);
get_border_color(tObj, img, rgba);
}
else {
- img->FetchTexelf(img, i, 0, 0, rgba);
+ swImg->FetchTexelf(swImg, i, 0, 0, rgba);
}
}
/**
* Return the texture sample for coordinate (s) using GL_LINEAR filter.
*/
-static INLINE void
+static inline void
sample_1d_linear(struct gl_context *ctx,
const struct gl_texture_object *tObj,
const struct gl_texture_image *img,
const GLfloat texcoord[4], GLfloat rgba[4])
{
+ const struct swrast_texture_image *swImg = swrast_texture_image_const(img);
const GLint width = img->Width2;
GLint i0, i1;
GLbitfield useBorderColor = 0x0;
get_border_color(tObj, img, t0);
}
else {
- img->FetchTexelf(img, i0, 0, 0, t0);
+ swImg->FetchTexelf(swImg, i0, 0, 0, t0);
}
if (useBorderColor & I1BIT) {
get_border_color(tObj, img, t1);
}
else {
- img->FetchTexelf(img, i1, 0, 0, t1);
+ swImg->FetchTexelf(swImg, i1, 0, 0, t1);
}
lerp_rgba(rgba, a, t0, t1);
/**
* Return the texture sample for coordinate (s,t) using GL_NEAREST filter.
*/
-static INLINE void
+static inline void
sample_2d_nearest(struct gl_context *ctx,
const struct gl_texture_object *tObj,
const struct gl_texture_image *img,
const GLfloat texcoord[4],
GLfloat rgba[])
{
+ const struct swrast_texture_image *swImg = swrast_texture_image_const(img);
const GLint width = img->Width2; /* without border, power of two */
const GLint height = img->Height2; /* without border, power of two */
GLint i, j;
get_border_color(tObj, img, rgba);
}
else {
- img->FetchTexelf(img, i, j, 0, rgba);
+ swImg->FetchTexelf(swImg, i, j, 0, rgba);
}
}
* Return the texture sample for coordinate (s,t) using GL_LINEAR filter.
* New sampling code contributed by Lynn Quam <quam@ai.sri.com>.
*/
-static INLINE void
+static inline void
sample_2d_linear(struct gl_context *ctx,
const struct gl_texture_object *tObj,
const struct gl_texture_image *img,
const GLfloat texcoord[4],
GLfloat rgba[])
{
+ const struct swrast_texture_image *swImg = swrast_texture_image_const(img);
const GLint width = img->Width2;
const GLint height = img->Height2;
GLint i0, j0, i1, j1;
get_border_color(tObj, img, t00);
}
else {
- img->FetchTexelf(img, i0, j0, 0, t00);
+ swImg->FetchTexelf(swImg, i0, j0, 0, t00);
}
if (useBorderColor & (I1BIT | J0BIT)) {
get_border_color(tObj, img, t10);
}
else {
- img->FetchTexelf(img, i1, j0, 0, t10);
+ swImg->FetchTexelf(swImg, i1, j0, 0, t10);
}
if (useBorderColor & (I0BIT | J1BIT)) {
get_border_color(tObj, img, t01);
}
else {
- img->FetchTexelf(img, i0, j1, 0, t01);
+ swImg->FetchTexelf(swImg, i0, j1, 0, t01);
}
if (useBorderColor & (I1BIT | J1BIT)) {
get_border_color(tObj, img, t11);
}
else {
- img->FetchTexelf(img, i1, j1, 0, t11);
+ swImg->FetchTexelf(swImg, i1, j1, 0, t11);
}
lerp_rgba_2d(rgba, a, b, t00, t10, t01, t11);
* As above, but we know WRAP_S == REPEAT and WRAP_T == REPEAT.
* We don't have to worry about the texture border.
*/
-static INLINE void
+static inline void
sample_2d_linear_repeat(struct gl_context *ctx,
const struct gl_texture_object *tObj,
const struct gl_texture_image *img,
const GLfloat texcoord[4],
GLfloat rgba[])
{
+ const struct swrast_texture_image *swImg = swrast_texture_image_const(img);
const GLint width = img->Width2;
const GLint height = img->Height2;
GLint i0, j0, i1, j1;
ASSERT(tObj->Sampler.WrapS == GL_REPEAT);
ASSERT(tObj->Sampler.WrapT == GL_REPEAT);
ASSERT(img->Border == 0);
- ASSERT(img->_BaseFormat != GL_COLOR_INDEX);
- ASSERT(img->_IsPowerOfTwo);
+ ASSERT(swImg->_IsPowerOfTwo);
linear_repeat_texel_location(width, texcoord[0], &i0, &i1, &wi);
linear_repeat_texel_location(height, texcoord[1], &j0, &j1, &wj);
- img->FetchTexelf(img, i0, j0, 0, t00);
- img->FetchTexelf(img, i1, j0, 0, t10);
- img->FetchTexelf(img, i0, j1, 0, t01);
- img->FetchTexelf(img, i1, j1, 0, t11);
+ swImg->FetchTexelf(swImg, i0, j0, 0, t00);
+ swImg->FetchTexelf(swImg, i1, j0, 0, t10);
+ swImg->FetchTexelf(swImg, i0, j1, 0, t01);
+ swImg->FetchTexelf(swImg, i1, j1, 0, t11);
lerp_rgba_2d(rgba, wi, wj, t00, t10, t01, t11);
}
{
GLuint i;
struct gl_texture_image *image = tObj->Image[0][tObj->BaseLevel];
+ const struct swrast_texture_image *swImg = swrast_texture_image_const(image);
(void) lambda;
if (tObj->Sampler.WrapS == GL_REPEAT &&
tObj->Sampler.WrapT == GL_REPEAT &&
- image->_IsPowerOfTwo &&
+ swImg->_IsPowerOfTwo &&
image->Border == 0) {
for (i = 0; i < n; i++) {
sample_2d_linear_repeat(ctx, tObj, image, texcoords[i], rgba[i]);
const GLfloat lambda[], GLfloat rgba[][4])
{
const struct gl_texture_image *img = tObj->Image[0][tObj->BaseLevel];
+ const struct swrast_texture_image *swImg = swrast_texture_image_const(img);
const GLfloat width = (GLfloat) img->Width;
const GLfloat height = (GLfloat) img->Height;
const GLint colMask = img->Width - 1;
ASSERT(tObj->Sampler.WrapT==GL_REPEAT);
ASSERT(img->Border==0);
ASSERT(img->TexFormat == MESA_FORMAT_RGB888);
- ASSERT(img->_IsPowerOfTwo);
+ ASSERT(swImg->_IsPowerOfTwo);
+ (void) swImg;
for (k=0; k<n; k++) {
GLint i = IFLOOR(texcoords[k][0] * width) & colMask;
const GLfloat lambda[], GLfloat rgba[][4])
{
const struct gl_texture_image *img = tObj->Image[0][tObj->BaseLevel];
+ const struct swrast_texture_image *swImg = swrast_texture_image_const(img);
const GLfloat width = (GLfloat) img->Width;
const GLfloat height = (GLfloat) img->Height;
const GLint colMask = img->Width - 1;
ASSERT(tObj->Sampler.WrapT==GL_REPEAT);
ASSERT(img->Border==0);
ASSERT(img->TexFormat == MESA_FORMAT_RGBA8888);
- ASSERT(img->_IsPowerOfTwo);
+ ASSERT(swImg->_IsPowerOfTwo);
+ (void) swImg;
for (i = 0; i < n; i++) {
const GLint col = IFLOOR(texcoords[i][0] * width) & colMask;
const GLfloat lambda[], GLfloat rgba[][4])
{
const struct gl_texture_image *tImg = tObj->Image[0][tObj->BaseLevel];
+ const struct swrast_texture_image *swImg = swrast_texture_image_const(tImg);
GLuint minStart, minEnd; /* texels with minification */
GLuint magStart, magEnd; /* texels with magnification */
const GLboolean repeatNoBorderPOT = (tObj->Sampler.WrapS == GL_REPEAT)
&& (tObj->Sampler.WrapT == GL_REPEAT)
&& (tImg->Border == 0 && (tImg->Width == tImg->RowStride))
- && (tImg->_BaseFormat != GL_COLOR_INDEX)
- && tImg->_IsPowerOfTwo;
+ && swImg->_IsPowerOfTwo;
ASSERT(lambda != NULL);
compute_min_mag_ranges(tObj, n, lambda,
}
+/* For anisotropic filtering */
+#define WEIGHT_LUT_SIZE 1024
+
+static GLfloat *weightLut = NULL;
+
+/**
+ * Creates the look-up table used to speed-up EWA sampling
+ */
+static void
+create_filter_table(void)
+{
+ GLuint i;
+ if (!weightLut) {
+ weightLut = (GLfloat *) malloc(WEIGHT_LUT_SIZE * sizeof(GLfloat));
+
+ for (i = 0; i < WEIGHT_LUT_SIZE; ++i) {
+ GLfloat alpha = 2;
+ GLfloat r2 = (GLfloat) i / (GLfloat) (WEIGHT_LUT_SIZE - 1);
+ GLfloat weight = (GLfloat) exp(-alpha * r2);
+ weightLut[i] = weight;
+ }
+ }
+}
+
+
+/**
+ * Elliptical weighted average (EWA) filter for producing high quality
+ * anisotropic filtered results.
+ * Based on the Higher Quality Elliptical Weighted Avarage Filter
+ * published by Paul S. Heckbert in his Master's Thesis
+ * "Fundamentals of Texture Mapping and Image Warping" (1989)
+ */
+static void
+sample_2d_ewa(struct gl_context *ctx,
+ const struct gl_texture_object *tObj,
+ const GLfloat texcoord[4],
+ const GLfloat dudx, const GLfloat dvdx,
+ const GLfloat dudy, const GLfloat dvdy, const GLint lod,
+ GLfloat rgba[])
+{
+ GLint level = lod > 0 ? lod : 0;
+ GLfloat scaling = 1.0 / (1 << level);
+ const struct gl_texture_image *img = tObj->Image[0][level];
+ const struct gl_texture_image *mostDetailedImage =
+ tObj->Image[0][tObj->BaseLevel];
+ const struct swrast_texture_image *swImg =
+ swrast_texture_image_const(mostDetailedImage);
+ GLfloat tex_u=-0.5 + texcoord[0] * swImg->WidthScale * scaling;
+ GLfloat tex_v=-0.5 + texcoord[1] * swImg->HeightScale * scaling;
+
+ GLfloat ux = dudx * scaling;
+ GLfloat vx = dvdx * scaling;
+ GLfloat uy = dudy * scaling;
+ GLfloat vy = dvdy * scaling;
+
+ /* compute ellipse coefficients to bound the region:
+ * A*x*x + B*x*y + C*y*y = F.
+ */
+ GLfloat A = vx*vx+vy*vy+1;
+ GLfloat B = -2*(ux*vx+uy*vy);
+ GLfloat C = ux*ux+uy*uy+1;
+ GLfloat F = A*C-B*B/4.0;
+
+ /* check if it is an ellipse */
+ /* ASSERT(F > 0.0); */
+
+ /* Compute the ellipse's (u,v) bounding box in texture space */
+ GLfloat d = -B*B+4.0*C*A;
+ GLfloat box_u = 2.0 / d * sqrt(d*C*F); /* box_u -> half of bbox with */
+ GLfloat box_v = 2.0 / d * sqrt(A*d*F); /* box_v -> half of bbox height */
+
+ GLint u0 = floor(tex_u - box_u);
+ GLint u1 = ceil (tex_u + box_u);
+ GLint v0 = floor(tex_v - box_v);
+ GLint v1 = ceil (tex_v + box_v);
+
+ GLfloat num[4] = {0.0F, 0.0F, 0.0F, 0.0F};
+ GLfloat newCoord[2];
+ GLfloat den = 0.0F;
+ GLfloat ddq;
+ GLfloat U = u0 - tex_u;
+ GLint v;
+
+ /* Scale ellipse formula to directly index the Filter Lookup Table.
+ * i.e. scale so that F = WEIGHT_LUT_SIZE-1
+ */
+ double formScale = (double) (WEIGHT_LUT_SIZE - 1) / F;
+ A *= formScale;
+ B *= formScale;
+ C *= formScale;
+ /* F *= formScale; */ /* no need to scale F as we don't use it below here */
+
+ /* Heckbert MS thesis, p. 59; scan over the bounding box of the ellipse
+ * and incrementally update the value of Ax^2+Bxy*Cy^2; when this
+ * value, q, is less than F, we're inside the ellipse
+ */
+ ddq = 2 * A;
+ for (v = v0; v <= v1; ++v) {
+ GLfloat V = v - tex_v;
+ GLfloat dq = A * (2 * U + 1) + B * V;
+ GLfloat q = (C * V + B * U) * V + A * U * U;
+
+ GLint u;
+ for (u = u0; u <= u1; ++u) {
+ /* Note that the ellipse has been pre-scaled so F = WEIGHT_LUT_SIZE - 1 */
+ if (q < WEIGHT_LUT_SIZE) {
+ /* as a LUT is used, q must never be negative;
+ * should not happen, though
+ */
+ const GLint qClamped = q >= 0.0F ? q : 0;
+ GLfloat weight = weightLut[qClamped];
+
+ newCoord[0] = u / ((GLfloat) img->Width2);
+ newCoord[1] = v / ((GLfloat) img->Height2);
+
+ sample_2d_nearest(ctx, tObj, img, newCoord, rgba);
+ num[0] += weight * rgba[0];
+ num[1] += weight * rgba[1];
+ num[2] += weight * rgba[2];
+ num[3] += weight * rgba[3];
+
+ den += weight;
+ }
+ q += dq;
+ dq += ddq;
+ }
+ }
+
+ if (den <= 0.0F) {
+ /* Reaching this place would mean
+ * that no pixels intersected the ellipse.
+ * This should never happen because
+ * the filter we use always
+ * intersects at least one pixel.
+ */
+
+ /*rgba[0]=0;
+ rgba[1]=0;
+ rgba[2]=0;
+ rgba[3]=0;*/
+ /* not enough pixels in resampling, resort to direct interpolation */
+ sample_2d_linear(ctx, tObj, img, texcoord, rgba);
+ return;
+ }
+
+ rgba[0] = num[0] / den;
+ rgba[1] = num[1] / den;
+ rgba[2] = num[2] / den;
+ rgba[3] = num[3] / den;
+}
+
+
+/**
+ * Anisotropic filtering using footprint assembly as outlined in the
+ * EXT_texture_filter_anisotropic spec:
+ * http://www.opengl.org/registry/specs/EXT/texture_filter_anisotropic.txt
+ * Faster than EWA but has less quality (more aliasing effects)
+ */
+static void
+sample_2d_footprint(struct gl_context *ctx,
+ const struct gl_texture_object *tObj,
+ const GLfloat texcoord[4],
+ const GLfloat dudx, const GLfloat dvdx,
+ const GLfloat dudy, const GLfloat dvdy, const GLint lod,
+ GLfloat rgba[])
+{
+ GLint level = lod > 0 ? lod : 0;
+ GLfloat scaling = 1.0F / (1 << level);
+ const struct gl_texture_image *img = tObj->Image[0][level];
+
+ GLfloat ux = dudx * scaling;
+ GLfloat vx = dvdx * scaling;
+ GLfloat uy = dudy * scaling;
+ GLfloat vy = dvdy * scaling;
+
+ GLfloat Px2 = ux * ux + vx * vx; /* squared length of dx */
+ GLfloat Py2 = uy * uy + vy * vy; /* squared length of dy */
+
+ GLint numSamples;
+ GLfloat ds;
+ GLfloat dt;
+
+ GLfloat num[4] = {0.0F, 0.0F, 0.0F, 0.0F};
+ GLfloat newCoord[2];
+ GLint s;
+
+ /* Calculate the per anisotropic sample offsets in s,t space. */
+ if (Px2 > Py2) {
+ numSamples = ceil(SQRTF(Px2));
+ ds = ux / ((GLfloat) img->Width2);
+ dt = vx / ((GLfloat) img->Height2);
+ }
+ else {
+ numSamples = ceil(SQRTF(Py2));
+ ds = uy / ((GLfloat) img->Width2);
+ dt = vy / ((GLfloat) img->Height2);
+ }
+
+ for (s = 0; s<numSamples; s++) {
+ newCoord[0] = texcoord[0] + ds * ((GLfloat)(s+1) / (numSamples+1) -0.5);
+ newCoord[1] = texcoord[1] + dt * ((GLfloat)(s+1) / (numSamples+1) -0.5);
+
+ sample_2d_linear(ctx, tObj, img, newCoord, rgba);
+ num[0] += rgba[0];
+ num[1] += rgba[1];
+ num[2] += rgba[2];
+ num[3] += rgba[3];
+ }
+
+ rgba[0] = num[0] / numSamples;
+ rgba[1] = num[1] / numSamples;
+ rgba[2] = num[2] / numSamples;
+ rgba[3] = num[3] / numSamples;
+}
+
+
+/**
+ * Returns the index of the specified texture object in the
+ * gl_context texture unit array.
+ */
+static inline GLuint
+texture_unit_index(const struct gl_context *ctx,
+ const struct gl_texture_object *tObj)
+{
+ const GLuint maxUnit
+ = (ctx->Texture._EnabledCoordUnits > 1) ? ctx->Const.MaxTextureUnits : 1;
+ GLuint u;
+
+ /* XXX CoordUnits vs. ImageUnits */
+ for (u = 0; u < maxUnit; u++) {
+ if (ctx->Texture.Unit[u]._Current == tObj)
+ break; /* found */
+ }
+ if (u >= maxUnit)
+ u = 0; /* not found, use 1st one; should never happen */
+
+ return u;
+}
+
+
+/**
+ * Sample 2D texture using an anisotropic filter.
+ * NOTE: the const GLfloat lambda_iso[] parameter does *NOT* contain
+ * the lambda float array but a "hidden" SWspan struct which is required
+ * by this function but is not available in the texture_sample_func signature.
+ * See _swrast_texture_span( struct gl_context *ctx, SWspan *span ) on how
+ * this function is called.
+ */
+static void
+sample_lambda_2d_aniso(struct gl_context *ctx,
+ const struct gl_texture_object *tObj,
+ GLuint n, const GLfloat texcoords[][4],
+ const GLfloat lambda_iso[], GLfloat rgba[][4])
+{
+ const struct gl_texture_image *tImg = tObj->Image[0][tObj->BaseLevel];
+ const struct swrast_texture_image *swImg = swrast_texture_image_const(tImg);
+ const GLfloat maxEccentricity =
+ tObj->Sampler.MaxAnisotropy * tObj->Sampler.MaxAnisotropy;
+
+ /* re-calculate the lambda values so that they are usable with anisotropic
+ * filtering
+ */
+ SWspan *span = (SWspan *)lambda_iso; /* access the "hidden" SWspan struct */
+
+ /* based on interpolate_texcoords(struct gl_context *ctx, SWspan *span)
+ * in swrast/s_span.c
+ */
+
+ /* find the texture unit index by looking up the current texture object
+ * from the context list of available texture objects.
+ */
+ const GLuint u = texture_unit_index(ctx, tObj);
+ const GLuint attr = FRAG_ATTRIB_TEX0 + u;
+ GLfloat texW, texH;
+
+ const GLfloat dsdx = span->attrStepX[attr][0];
+ const GLfloat dsdy = span->attrStepY[attr][0];
+ const GLfloat dtdx = span->attrStepX[attr][1];
+ const GLfloat dtdy = span->attrStepY[attr][1];
+ const GLfloat dqdx = span->attrStepX[attr][3];
+ const GLfloat dqdy = span->attrStepY[attr][3];
+ GLfloat s = span->attrStart[attr][0] + span->leftClip * dsdx;
+ GLfloat t = span->attrStart[attr][1] + span->leftClip * dtdx;
+ GLfloat q = span->attrStart[attr][3] + span->leftClip * dqdx;
+
+ /* from swrast/s_texcombine.c _swrast_texture_span */
+ const struct gl_texture_unit *texUnit = &ctx->Texture.Unit[u];
+ const GLboolean adjustLOD =
+ (texUnit->LodBias + tObj->Sampler.LodBias != 0.0F)
+ || (tObj->Sampler.MinLod != -1000.0 || tObj->Sampler.MaxLod != 1000.0);
+
+ GLuint i;
+
+ /* on first access create the lookup table containing the filter weights. */
+ if (!weightLut) {
+ create_filter_table();
+ }
+
+ texW = swImg->WidthScale;
+ texH = swImg->HeightScale;
+
+ for (i = 0; i < n; i++) {
+ const GLfloat invQ = (q == 0.0F) ? 1.0F : (1.0F / q);
+
+ GLfloat dudx = texW * ((s + dsdx) / (q + dqdx) - s * invQ);
+ GLfloat dvdx = texH * ((t + dtdx) / (q + dqdx) - t * invQ);
+ GLfloat dudy = texW * ((s + dsdy) / (q + dqdy) - s * invQ);
+ GLfloat dvdy = texH * ((t + dtdy) / (q + dqdy) - t * invQ);
+
+ /* note: instead of working with Px and Py, we will use the
+ * squared length instead, to avoid sqrt.
+ */
+ GLfloat Px2 = dudx * dudx + dvdx * dvdx;
+ GLfloat Py2 = dudy * dudy + dvdy * dvdy;
+
+ GLfloat Pmax2;
+ GLfloat Pmin2;
+ GLfloat e;
+ GLfloat lod;
+
+ s += dsdx;
+ t += dtdx;
+ q += dqdx;
+
+ if (Px2 < Py2) {
+ Pmax2 = Py2;
+ Pmin2 = Px2;
+ }
+ else {
+ Pmax2 = Px2;
+ Pmin2 = Py2;
+ }
+
+ /* if the eccentricity of the ellipse is too big, scale up the shorter
+ * of the two vectors to limit the maximum amount of work per pixel
+ */
+ e = Pmax2 / Pmin2;
+ if (e > maxEccentricity) {
+ /* GLfloat s=e / maxEccentricity;
+ minor[0] *= s;
+ minor[1] *= s;
+ Pmin2 *= s; */
+ Pmin2 = Pmax2 / maxEccentricity;
+ }
+
+ /* note: we need to have Pmin=sqrt(Pmin2) here, but we can avoid
+ * this since 0.5*log(x) = log(sqrt(x))
+ */
+ lod = 0.5 * LOG2(Pmin2);
+
+ if (adjustLOD) {
+ /* from swrast/s_texcombine.c _swrast_texture_span */
+ if (texUnit->LodBias + tObj->Sampler.LodBias != 0.0F) {
+ /* apply LOD bias, but don't clamp yet */
+ const GLfloat bias =
+ CLAMP(texUnit->LodBias + tObj->Sampler.LodBias,
+ -ctx->Const.MaxTextureLodBias,
+ ctx->Const.MaxTextureLodBias);
+ lod += bias;
+
+ if (tObj->Sampler.MinLod != -1000.0 ||
+ tObj->Sampler.MaxLod != 1000.0) {
+ /* apply LOD clamping to lambda */
+ lod = CLAMP(lod, tObj->Sampler.MinLod, tObj->Sampler.MaxLod);
+ }
+ }
+ }
+
+ /* If the ellipse covers the whole image, we can
+ * simply return the average of the whole image.
+ */
+ if (lod >= tObj->_MaxLevel) {
+ sample_2d_linear(ctx, tObj, tObj->Image[0][tObj->_MaxLevel],
+ texcoords[i], rgba[i]);
+ }
+ else {
+ /* don't bother interpolating between multiple LODs; it doesn't
+ * seem to be worth the extra running time.
+ */
+ sample_2d_ewa(ctx, tObj, texcoords[i],
+ dudx, dvdx, dudy, dvdy, floor(lod), rgba[i]);
+
+ /* unused: */
+ (void) sample_2d_footprint;
+ /*
+ sample_2d_footprint(ctx, tObj, texcoords[i],
+ dudx, dvdx, dudy, dvdy, floor(lod), rgba[i]);
+ */
+ }
+ }
+}
+
+
/**********************************************************************/
/* 3-D Texture Sampling Functions */
/**
* Return the texture sample for coordinate (s,t,r) using GL_NEAREST filter.
*/
-static INLINE void
+static inline void
sample_3d_nearest(struct gl_context *ctx,
const struct gl_texture_object *tObj,
const struct gl_texture_image *img,
const GLfloat texcoord[4],
GLfloat rgba[4])
{
+ const struct swrast_texture_image *swImg = swrast_texture_image_const(img);
const GLint width = img->Width2; /* without border, power of two */
const GLint height = img->Height2; /* without border, power of two */
const GLint depth = img->Depth2; /* without border, power of two */
get_border_color(tObj, img, rgba);
}
else {
- img->FetchTexelf(img, i, j, k, rgba);
+ swImg->FetchTexelf(swImg, i, j, k, rgba);
}
}
const GLfloat texcoord[4],
GLfloat rgba[4])
{
+ const struct swrast_texture_image *swImg = swrast_texture_image_const(img);
const GLint width = img->Width2;
const GLint height = img->Height2;
const GLint depth = img->Depth2;
get_border_color(tObj, img, t000);
}
else {
- img->FetchTexelf(img, i0, j0, k0, t000);
+ swImg->FetchTexelf(swImg, i0, j0, k0, t000);
}
if (useBorderColor & (I1BIT | J0BIT | K0BIT)) {
get_border_color(tObj, img, t100);
}
else {
- img->FetchTexelf(img, i1, j0, k0, t100);
+ swImg->FetchTexelf(swImg, i1, j0, k0, t100);
}
if (useBorderColor & (I0BIT | J1BIT | K0BIT)) {
get_border_color(tObj, img, t010);
}
else {
- img->FetchTexelf(img, i0, j1, k0, t010);
+ swImg->FetchTexelf(swImg, i0, j1, k0, t010);
}
if (useBorderColor & (I1BIT | J1BIT | K0BIT)) {
get_border_color(tObj, img, t110);
}
else {
- img->FetchTexelf(img, i1, j1, k0, t110);
+ swImg->FetchTexelf(swImg, i1, j1, k0, t110);
}
if (useBorderColor & (I0BIT | J0BIT | K1BIT)) {
get_border_color(tObj, img, t001);
}
else {
- img->FetchTexelf(img, i0, j0, k1, t001);
+ swImg->FetchTexelf(swImg, i0, j0, k1, t001);
}
if (useBorderColor & (I1BIT | J0BIT | K1BIT)) {
get_border_color(tObj, img, t101);
}
else {
- img->FetchTexelf(img, i1, j0, k1, t101);
+ swImg->FetchTexelf(swImg, i1, j0, k1, t101);
}
if (useBorderColor & (I0BIT | J1BIT | K1BIT)) {
get_border_color(tObj, img, t011);
}
else {
- img->FetchTexelf(img, i0, j1, k1, t011);
+ swImg->FetchTexelf(swImg, i0, j1, k1, t011);
}
if (useBorderColor & (I1BIT | J1BIT | K1BIT)) {
get_border_color(tObj, img, t111);
}
else {
- img->FetchTexelf(img, i1, j1, k1, t111);
+ swImg->FetchTexelf(swImg, i1, j1, k1, t111);
}
/* trilinear interpolation of samples */
GLfloat rgba[][4])
{
const struct gl_texture_image *img = tObj->Image[0][0];
+ const struct swrast_texture_image *swImg = swrast_texture_image_const(img);
const GLint width = img->Width;
const GLint height = img->Height;
GLuint i;
ASSERT(tObj->Sampler.WrapT == GL_CLAMP ||
tObj->Sampler.WrapT == GL_CLAMP_TO_EDGE ||
tObj->Sampler.WrapT == GL_CLAMP_TO_BORDER);
- ASSERT(img->_BaseFormat != GL_COLOR_INDEX);
for (i = 0; i < n; i++) {
GLint row, col;
if (col < 0 || col >= width || row < 0 || row >= height)
get_border_color(tObj, img, rgba[i]);
else
- img->FetchTexelf(img, col, row, 0, rgba[i]);
+ swImg->FetchTexelf(swImg, col, row, 0, rgba[i]);
}
}
const GLfloat lambda[], GLfloat rgba[][4])
{
const struct gl_texture_image *img = tObj->Image[0][0];
+ const struct swrast_texture_image *swImg = swrast_texture_image_const(img);
const GLint width = img->Width;
const GLint height = img->Height;
GLuint i;
ASSERT(tObj->Sampler.WrapT == GL_CLAMP ||
tObj->Sampler.WrapT == GL_CLAMP_TO_EDGE ||
tObj->Sampler.WrapT == GL_CLAMP_TO_BORDER);
- ASSERT(img->_BaseFormat != GL_COLOR_INDEX);
for (i = 0; i < n; i++) {
GLint i0, j0, i1, j1;
if (useBorderColor & (I0BIT | J0BIT))
get_border_color(tObj, img, t00);
else
- img->FetchTexelf(img, i0, j0, 0, t00);
+ swImg->FetchTexelf(swImg, i0, j0, 0, t00);
if (useBorderColor & (I1BIT | J0BIT))
get_border_color(tObj, img, t10);
else
- img->FetchTexelf(img, i1, j0, 0, t10);
+ swImg->FetchTexelf(swImg, i1, j0, 0, t10);
if (useBorderColor & (I0BIT | J1BIT))
get_border_color(tObj, img, t01);
else
- img->FetchTexelf(img, i0, j1, 0, t01);
+ swImg->FetchTexelf(swImg, i0, j1, 0, t01);
if (useBorderColor & (I1BIT | J1BIT))
get_border_color(tObj, img, t11);
else
- img->FetchTexelf(img, i1, j1, 0, t11);
+ swImg->FetchTexelf(swImg, i1, j1, 0, t11);
lerp_rgba_2d(rgba[i], a, b, t00, t10, t01, t11);
}
const GLfloat texcoord[4],
GLfloat rgba[4])
{
+ const struct swrast_texture_image *swImg = swrast_texture_image_const(img);
const GLint width = img->Width2; /* without border, power of two */
const GLint height = img->Height2; /* without border, power of two */
const GLint depth = img->Depth;
get_border_color(tObj, img, rgba);
}
else {
- img->FetchTexelf(img, i, j, array, rgba);
+ swImg->FetchTexelf(swImg, i, j, array, rgba);
}
}
const GLfloat texcoord[4],
GLfloat rgba[4])
{
+ const struct swrast_texture_image *swImg = swrast_texture_image_const(img);
const GLint width = img->Width2;
const GLint height = img->Height2;
const GLint depth = img->Depth;
get_border_color(tObj, img, t00);
}
else {
- img->FetchTexelf(img, i0, j0, array, t00);
+ swImg->FetchTexelf(swImg, i0, j0, array, t00);
}
if (useBorderColor & (I1BIT | J0BIT)) {
get_border_color(tObj, img, t10);
}
else {
- img->FetchTexelf(img, i1, j0, array, t10);
+ swImg->FetchTexelf(swImg, i1, j0, array, t10);
}
if (useBorderColor & (I0BIT | J1BIT)) {
get_border_color(tObj, img, t01);
}
else {
- img->FetchTexelf(img, i0, j1, array, t01);
+ swImg->FetchTexelf(swImg, i0, j1, array, t01);
}
if (useBorderColor & (I1BIT | J1BIT)) {
get_border_color(tObj, img, t11);
}
else {
- img->FetchTexelf(img, i1, j1, array, t11);
+ swImg->FetchTexelf(swImg, i1, j1, array, t11);
}
/* trilinear interpolation of samples */
const GLfloat texcoord[4],
GLfloat rgba[4])
{
+ const struct swrast_texture_image *swImg = swrast_texture_image_const(img);
const GLint width = img->Width2; /* without border, power of two */
const GLint height = img->Height;
GLint i;
get_border_color(tObj, img, rgba);
}
else {
- img->FetchTexelf(img, i, array, 0, rgba);
+ swImg->FetchTexelf(swImg, i, array, 0, rgba);
}
}
const GLfloat texcoord[4],
GLfloat rgba[4])
{
+ const struct swrast_texture_image *swImg = swrast_texture_image_const(img);
const GLint width = img->Width2;
const GLint height = img->Height;
GLint i0, i1;
get_border_color(tObj, img, t0);
}
else {
- img->FetchTexelf(img, i0, array, 0, t0);
+ swImg->FetchTexelf(swImg, i0, array, 0, t0);
}
if (useBorderColor & (I1BIT | K0BIT)) {
get_border_color(tObj, img, t1);
}
else {
- img->FetchTexelf(img, i1, array, 0, t1);
+ swImg->FetchTexelf(swImg, i1, array, 0, t1);
}
/* bilinear interpolation of samples */
/**
* Compare texcoord against depth sample. Return 1.0 or the ambient value.
*/
-static INLINE GLfloat
+static inline GLfloat
shadow_compare(GLenum function, GLfloat coord, GLfloat depthSample,
GLfloat ambient)
{
/**
* Compare texcoord against four depth samples.
*/
-static INLINE GLfloat
+static inline GLfloat
shadow_compare4(GLenum function, GLfloat coord,
GLfloat depth00, GLfloat depth01,
GLfloat depth10, GLfloat depth11,
{
const GLint level = choose_depth_texture_level(tObj, lambda[0]);
const struct gl_texture_image *img = tObj->Image[0][level];
+ const struct swrast_texture_image *swImg = swrast_texture_image_const(img);
const GLint width = img->Width;
const GLint height = img->Height;
const GLint depth = img->Depth;
if (col >= 0 && row >= 0 && col < width && row < height &&
slice >= 0 && slice < depth) {
- img->FetchTexelf(img, col, row, slice, &depthSample);
+ swImg->FetchTexelf(swImg, col, row, slice, &depthSample);
}
else {
depthSample = tObj->Sampler.BorderColor.f[0];
depth00 = tObj->Sampler.BorderColor.f[0];
}
else {
- img->FetchTexelf(img, i0, j0, slice, &depth00);
+ swImg->FetchTexelf(swImg, i0, j0, slice, &depth00);
}
if (useBorderTexel & (I1BIT | J0BIT)) {
depth10 = tObj->Sampler.BorderColor.f[0];
}
else {
- img->FetchTexelf(img, i1, j0, slice, &depth10);
+ swImg->FetchTexelf(swImg, i1, j0, slice, &depth10);
}
if (tObj->Target != GL_TEXTURE_1D_ARRAY_EXT) {
depth01 = tObj->Sampler.BorderColor.f[0];
}
else {
- img->FetchTexelf(img, i0, j1, slice, &depth01);
+ swImg->FetchTexelf(swImg, i0, j1, slice, &depth01);
}
if (useBorderTexel & (I1BIT | J1BIT)) {
depth11 = tObj->Sampler.BorderColor.f[0];
}
else {
- img->FetchTexelf(img, i1, j1, slice, &depth11);
+ swImg->FetchTexelf(swImg, i1, j1, slice, &depth11);
}
}
else {
return &sample_depth_texture;
}
else if (needLambda) {
+ /* Anisotropic filtering extension. Activated only if mipmaps are used */
+ if (t->Sampler.MaxAnisotropy > 1.0 &&
+ t->Sampler.MinFilter == GL_LINEAR_MIPMAP_LINEAR) {
+ return &sample_lambda_2d_aniso;
+ }
return &sample_lambda_2d;
}
else if (t->Sampler.MinFilter == GL_LINEAR) {
else {
/* check for a few optimized cases */
const struct gl_texture_image *img = t->Image[0][t->BaseLevel];
+ const struct swrast_texture_image *swImg =
+ swrast_texture_image_const(img);
+
ASSERT(t->Sampler.MinFilter == GL_NEAREST);
if (t->Sampler.WrapS == GL_REPEAT &&
t->Sampler.WrapT == GL_REPEAT &&
- img->_IsPowerOfTwo &&
+ swImg->_IsPowerOfTwo &&
img->Border == 0 &&
img->TexFormat == MESA_FORMAT_RGB888) {
return &opt_sample_rgb_2d;
}
else if (t->Sampler.WrapS == GL_REPEAT &&
t->Sampler.WrapT == GL_REPEAT &&
- img->_IsPowerOfTwo &&
+ swImg->_IsPowerOfTwo &&
img->Border == 0 &&
img->TexFormat == MESA_FORMAT_RGBA8888) {
return &opt_sample_rgba_2d;