| // Copyright 2019 The Fuchsia Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "spinel/ext/transform_stack/transform_stack.h" |
| |
| #include "common/macros.h" |
| |
| // |
| // |
| // |
| |
| #include <assert.h> |
| #include <math.h> |
| #include <stdlib.h> |
| |
| // |
| // |
| // |
| |
| #define SPN_TS_MAX_MACRO(t, a, b) (((a) > (b)) ? (a) : (b)) |
| #define SPN_TS_MIN_MACRO(t, a, b) (((a) < (b)) ? (a) : (b)) |
| |
| // |
| // clang-format off |
| // |
| |
| #define SPN_TRANSFORM_STACK_SIN(x_) sinf(x_) |
| #define SPN_TRANSFORM_STACK_COS(x_) cosf(x_) |
| #define SPN_TRANSFORM_STACK_TAN(x_) tanf(x_) |
| |
| // |
| // |
| // |
| |
| #define SPN_TRANSFORM_STACK_ZERO 0.0f |
| #define SPN_TRANSFORM_STACK_ONE 1.0f |
| #define SPN_TRANSFORM_STACK_RCP(f_) (SPN_TRANSFORM_STACK_ONE / (f_)) |
| |
| // |
| // |
| // |
| |
| union spinel_transform_stack_3x3_u |
| { |
| float a8[8]; |
| |
| struct { |
| float sx; |
| float shx; |
| float tx; |
| float shy; |
| float sy; |
| float ty; |
| float w0; |
| float w1; |
| // w2 is always 1.0 |
| }; |
| |
| struct |
| { |
| float a; |
| float b; |
| float c; |
| |
| float d; |
| float e; |
| float f; |
| |
| float g; |
| float h; |
| // i is always 1.0 |
| }; |
| |
| spinel_transform_t t; |
| }; |
| |
| // |
| // |
| // |
| |
| struct spinel_transform_stack |
| { |
| uint32_t size; |
| uint32_t count; |
| |
| spinel_transform_weakref_t * weakrefs; |
| union spinel_transform_stack_3x3_u * transforms; |
| }; |
| |
| // |
| // clang-format on |
| // |
| |
| static void |
| spinel_transform_stack_resize(struct spinel_transform_stack * ts, uint32_t size) |
| { |
| ts->size = size; |
| ts->weakrefs = realloc(ts->weakrefs, size * sizeof(*ts->weakrefs)); |
| ts->transforms = realloc(ts->transforms, size * sizeof(*ts->transforms)); |
| } |
| |
| static void |
| spinel_transform_stack_ensure(struct spinel_transform_stack * ts) |
| { |
| if (ts->count < ts->size) |
| return; |
| |
| // increase by 50% and by at least 8 |
| uint32_t const pad = ts->size / 2; |
| |
| spinel_transform_stack_resize(ts, ts->size + SPN_TS_MAX_MACRO(uint32_t, pad, 8)); |
| } |
| |
| // |
| // |
| // |
| |
| struct spinel_transform_stack * |
| spinel_transform_stack_create(uint32_t size) |
| { |
| struct spinel_transform_stack * ts = MALLOC_MACRO(sizeof(*ts)); |
| |
| ts->size = size; |
| ts->count = 0; |
| |
| ts->transforms = NULL; |
| ts->weakrefs = NULL; |
| |
| spinel_transform_stack_resize(ts, size); |
| |
| return ts; |
| } |
| |
| void |
| spinel_transform_stack_release(struct spinel_transform_stack * ts) |
| { |
| free(ts->transforms); |
| free(ts->weakrefs); |
| |
| free(ts); |
| } |
| |
| // |
| // |
| // |
| |
| uint32_t |
| spinel_transform_stack_save(struct spinel_transform_stack * ts) |
| { |
| return ts->count; |
| } |
| |
| void |
| spinel_transform_stack_restore(struct spinel_transform_stack * ts, uint32_t restore) |
| { |
| ts->count = restore; |
| } |
| |
| // |
| // |
| // |
| |
| static union spinel_transform_stack_3x3_u * |
| spinel_transform_stack_tos(struct spinel_transform_stack * ts) |
| { |
| return ts->transforms + ts->count - 1; |
| } |
| |
| // |
| // |
| // |
| |
| static void |
| spinel_transform_stack_3x3_u_copy(union spinel_transform_stack_3x3_u * const __restrict dst, |
| union spinel_transform_stack_3x3_u const * const __restrict src) |
| { |
| *dst = *src; |
| } |
| |
| // |
| // C = A * B |
| // |
| // FIXME(allanmac) -- can save affine vs. projective flags and save a few ops |
| // |
| |
| // |
| // clang-format off |
| // |
| |
| #define SPN_TRANSFORM_STACK_MULTIPLY(A,B) \ |
| A->sx * B->sx + A->shx * B->shy + A->tx * B->w0, \ |
| A->sx * B->shx + A->shx * B->sy + A->tx * B->w1, \ |
| A->sx * B->tx + A->shx * B->ty + A->tx, \ |
| A->shy * B->sx + A->sy * B->shy + A->ty * B->w0, \ |
| A->shy * B->shx + A->sy * B->sy + A->ty * B->w1, \ |
| A->shy * B->tx + A->sy * B->ty + A->ty, \ |
| A->w0 * B->sx + A->w1 * B->shy + B->w0, \ |
| A->w0 * B->shx + A->w1 * B->sy + B->w1, \ |
| A->w0 * B->tx + A->w1 * B->ty + SPN_TRANSFORM_STACK_ONE |
| |
| // |
| // clang-format on |
| // |
| |
| #define SPN_TRANSFORM_STACK_IS_AFFINE(t_) \ |
| ((t_->w0 == SPN_TRANSFORM_STACK_ZERO) && (t_->w1 == SPN_TRANSFORM_STACK_ZERO)) |
| |
| static spinel_transform_stack_entry_e |
| spinel_transform_stack_classify(struct spinel_transform_stack * ts) |
| { |
| union spinel_transform_stack_3x3_u const * const t = spinel_transform_stack_tos(ts); |
| |
| if (SPN_TRANSFORM_STACK_IS_AFFINE(t)) |
| { |
| return SPN_TRANSFORM_STACK_ENTRY_AFFINE; |
| } |
| else |
| { |
| return SPN_TRANSFORM_STACK_ENTRY_PROJECTIVE; |
| } |
| } |
| |
| // |
| // |
| // |
| |
| spinel_transform_t const * |
| spinel_transform_stack_top_transform(struct spinel_transform_stack * ts) |
| { |
| return &spinel_transform_stack_tos(ts)->t; |
| } |
| |
| spinel_transform_weakref_t * |
| spinel_transform_stack_top_weakref(struct spinel_transform_stack * ts) |
| { |
| return ts->weakrefs + ts->count - 1; |
| } |
| |
| // |
| // |
| // |
| |
| void |
| spinel_transform_stack_dup(struct spinel_transform_stack * ts) |
| { |
| spinel_transform_stack_ensure(ts); |
| |
| union spinel_transform_stack_3x3_u * const tos = spinel_transform_stack_tos(ts); |
| |
| spinel_transform_stack_3x3_u_copy(tos + 1, tos); |
| |
| ts->weakrefs[ts->count] = ts->weakrefs[ts->count - 1]; |
| |
| ts->count += 1; |
| } |
| |
| void |
| spinel_transform_stack_drop(struct spinel_transform_stack * ts) |
| { |
| assert(ts->count >= 1); |
| |
| ts->count -= 1; |
| } |
| |
| // |
| // |
| // |
| |
| #if 0 // NOTE(allanmac): WILL BE USED IN THE FUTURE |
| |
| static void |
| spinel_transform_stack_swap_drop(struct spinel_transform_stack * ts) |
| { |
| assert(ts->count >= 2); |
| |
| union spinel_transform_stack_3x3_u * const tos = spinel_transform_stack_tos(ts); |
| |
| spinel_transform_stack_3x3_u_copy(tos - 1, tos); |
| |
| ts->weakrefs[ts->count - 2] = ts->weakrefs[ts->count - 1]; |
| |
| ts->count -= 1; |
| } |
| |
| #endif |
| |
| // |
| // |
| // |
| |
| static void |
| spinel_transform_stack_store_matrix_8(struct spinel_transform_stack * ts, |
| uint32_t idx, |
| float sx, |
| float shx, |
| float tx, |
| float shy, |
| float sy, |
| float ty, |
| float w0, |
| float w1) |
| { |
| union spinel_transform_stack_3x3_u * t = ts->transforms + idx; |
| |
| t->sx = sx; |
| t->shx = shx; |
| t->tx = tx; |
| t->shy = shy; |
| t->sy = sy; |
| t->ty = ty; |
| t->w0 = w0; |
| t->w1 = w1; |
| |
| ts->weakrefs[idx] = SPN_TRANSFORM_WEAKREF_INVALID; |
| } |
| |
| // |
| // |
| // |
| |
| static void |
| spinel_transform_stack_store_matrix(struct spinel_transform_stack * ts, |
| uint32_t idx, |
| float sx, |
| float shx, |
| float tx, |
| float shy, |
| float sy, |
| float ty, |
| float w0, |
| float w1, |
| float w2) |
| { |
| if (w2 == SPN_TRANSFORM_STACK_ONE) |
| { |
| spinel_transform_stack_store_matrix_8(ts, idx, sx, shx, tx, shy, sy, ty, w0, w1); |
| } |
| else |
| { |
| // normalize |
| float const d = SPN_TRANSFORM_STACK_RCP(w2); |
| |
| spinel_transform_stack_store_matrix_8(ts, |
| idx, |
| sx * d, |
| shx * d, |
| tx * d, |
| shy * d, |
| sy * d, |
| ty * d, |
| w0 * d, |
| w1 * d); |
| } |
| } |
| |
| // |
| // |
| // |
| |
| static void |
| spinel_transform_stack_push_matrix_8(struct spinel_transform_stack * ts, |
| float sx, |
| float shx, |
| float tx, |
| float shy, |
| float sy, |
| float ty, |
| float w0, |
| float w1) |
| { |
| spinel_transform_stack_ensure(ts); |
| |
| spinel_transform_stack_store_matrix_8(ts, ts->count++, sx, shx, tx, shy, sy, ty, w0, w1); |
| } |
| |
| // |
| // |
| // |
| |
| void |
| spinel_transform_stack_push_matrix(struct spinel_transform_stack * ts, |
| float sx, |
| float shx, |
| float tx, |
| float shy, |
| float sy, |
| float ty, |
| float w0, |
| float w1, |
| float w2) |
| { |
| if (w2 == SPN_TRANSFORM_STACK_ONE) |
| { |
| spinel_transform_stack_push_matrix_8(ts, sx, shx, tx, shy, sy, ty, w0, w1); |
| } |
| else |
| { |
| // normalize |
| float d = SPN_TRANSFORM_STACK_RCP(w2); |
| |
| spinel_transform_stack_push_matrix_8(ts, |
| sx * d, |
| shx * d, |
| tx * d, |
| shy * d, |
| sy * d, |
| ty * d, |
| w0 * d, |
| w1 * d); |
| } |
| } |
| |
| // |
| // |
| // |
| |
| void |
| spinel_transform_stack_push_transform(struct spinel_transform_stack * ts, |
| spinel_transform_t const * transform) |
| { |
| spinel_transform_stack_ensure(ts); |
| |
| uint32_t const idx = ts->count++; |
| union spinel_transform_stack_3x3_u * t = ts->transforms + idx; |
| |
| t->t = *transform; |
| |
| ts->weakrefs[idx] = SPN_TRANSFORM_WEAKREF_INVALID; |
| } |
| |
| // |
| // |
| // |
| |
| void |
| spinel_transform_stack_push_identity(struct spinel_transform_stack * ts) |
| { |
| spinel_transform_stack_push_matrix_8(ts, 1.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0); |
| } |
| |
| void |
| spinel_transform_stack_push_affine( |
| struct spinel_transform_stack * ts, float sx, float shx, float tx, float shy, float sy, float ty) |
| { |
| spinel_transform_stack_push_matrix_8(ts, sx, shx, tx, shy, sy, ty, 0.0, 0.0); |
| } |
| |
| void |
| spinel_transform_stack_push_translate(struct spinel_transform_stack * ts, float tx, float ty) |
| { |
| spinel_transform_stack_push_matrix_8(ts, 1.0, 0.0, tx, 0.0, 1.0, ty, 0.0, 0.0); |
| } |
| |
| void |
| spinel_transform_stack_push_scale(struct spinel_transform_stack * ts, float sx, float sy) |
| { |
| spinel_transform_stack_push_matrix_8(ts, sx, 0.0, 0.0, 0.0, sy, 0.0, 0.0, 0.0); |
| } |
| |
| void |
| spinel_transform_stack_push_shear(struct spinel_transform_stack * ts, float shx, float shy) |
| { |
| spinel_transform_stack_push_matrix_8(ts, 1.0, shx, 0.0, shy, 1.0, 0.0, 0.0, 0.0); |
| } |
| |
| void |
| spinel_transform_stack_push_skew_x(struct spinel_transform_stack * ts, float theta) |
| { |
| // FIXME(allanmac): replace with tanpi if available |
| float const tan_theta = SPN_TRANSFORM_STACK_TAN(theta); |
| |
| spinel_transform_stack_push_matrix_8(ts, 1.0, tan_theta, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0); |
| } |
| |
| void |
| spinel_transform_stack_push_skew_y(struct spinel_transform_stack * ts, float theta) |
| { |
| // FIXME(allanmac): replace with tanpi if available |
| float const tan_theta = SPN_TRANSFORM_STACK_TAN(theta); |
| |
| spinel_transform_stack_push_matrix_8(ts, 1.0, 0.0, 0.0, tan_theta, 1.0, 0.0, 0.0, 0.0); |
| } |
| |
| void |
| spinel_transform_stack_push_rotate(struct spinel_transform_stack * ts, float theta) |
| { |
| // FIXME(allanmac): replace with cospi if available |
| float const cos_theta = SPN_TRANSFORM_STACK_COS(theta); |
| // FIXME(allanmac): replace with sinpi if available |
| float const sin_theta = SPN_TRANSFORM_STACK_SIN(theta); |
| |
| spinel_transform_stack_push_matrix_8(ts, |
| cos_theta, |
| -sin_theta, |
| 0.0, |
| sin_theta, |
| cos_theta, |
| 0.0, |
| 0.0, |
| 0.0); |
| } |
| |
| void |
| spinel_transform_stack_push_rotate_xy2(struct spinel_transform_stack * ts, // |
| float theta, |
| float cx, |
| float cy, |
| float tx, |
| float ty) |
| { |
| // FIXME(allanmac): replace with cospi if available |
| float const cos_theta = SPN_TRANSFORM_STACK_COS(theta); |
| // FIXME(allanmac): replace with sinpi if available |
| float const sin_theta = SPN_TRANSFORM_STACK_SIN(theta); |
| |
| spinel_transform_stack_push_matrix_8(ts, |
| cos_theta, |
| -sin_theta, |
| tx - (cx * cos_theta) + (cy * sin_theta), |
| sin_theta, |
| cos_theta, |
| ty - (cx * sin_theta) - (cy * cos_theta), |
| 0.0, |
| 0.0); |
| } |
| |
| void |
| spinel_transform_stack_push_rotate_xy(struct spinel_transform_stack * ts, |
| float theta, |
| float cx, |
| float cy) |
| { |
| spinel_transform_stack_push_rotate_xy2(ts, theta, cx, cy, cx, cy); |
| } |
| |
| void |
| spinel_transform_stack_push_rotate_scale_xy(struct spinel_transform_stack * ts, // |
| float theta, |
| float sx, |
| float sy, |
| float cx, |
| float cy) |
| { |
| // FIXME(allanmac): replace with cospi if available |
| float const cos_theta = SPN_TRANSFORM_STACK_COS(theta); |
| // FIXME(allanmac): replace with sinpi if available |
| float const sin_theta = SPN_TRANSFORM_STACK_SIN(theta); |
| |
| spinel_transform_stack_push_matrix_8(ts, |
| sx * cos_theta, |
| -sx * sin_theta, |
| cx - cx * sx * cos_theta + cy * sy * sin_theta, |
| sy * sin_theta, |
| sy * cos_theta, |
| cy - cy * sy * cos_theta - cx * sx * sin_theta, |
| 0.0, |
| 0.0); |
| } |
| |
| // |
| // See: "Fundamentals of Texture Mapping and Image Warping" by Paul S. Heckbert (1989) |
| // |
| |
| #define DET(a, b, c, d) (a * d - b * c) |
| |
| #define X(v, i) v[i * 2] |
| #define Y(v, i) v[i * 2 + 1] |
| |
| // |
| // |
| // |
| |
| spinel_transform_stack_entry_e |
| spinel_transform_stack_adjoint(struct spinel_transform_stack * ts) |
| { |
| union spinel_transform_stack_3x3_u * const t = spinel_transform_stack_tos(ts); |
| |
| #if 0 |
| // save for determinant |
| float const a = t->a; |
| float const b = t->b; |
| float const c = t->c; |
| #endif |
| |
| spinel_transform_stack_store_matrix(ts, |
| ts->count - 1, |
| |
| +DET(t->e, t->f, t->h, SPN_TRANSFORM_STACK_ONE), |
| -DET(t->b, t->c, t->h, SPN_TRANSFORM_STACK_ONE), |
| +DET(t->b, t->c, t->e, t->f), |
| |
| -DET(t->d, t->f, t->g, SPN_TRANSFORM_STACK_ONE), |
| +DET(t->a, t->c, t->g, SPN_TRANSFORM_STACK_ONE), |
| -DET(t->a, t->c, t->d, t->f), |
| |
| +DET(t->d, t->e, t->g, t->h), |
| -DET(t->a, t->b, t->g, t->h), |
| +DET(t->a, t->b, t->d, t->e)); |
| |
| #if 0 |
| // determinant of t |
| float const det = a * t->a + b * t->d + c * t->g; |
| #endif |
| |
| return spinel_transform_stack_classify(ts); |
| } |
| |
| // |
| // |
| // |
| |
| spinel_transform_stack_entry_e |
| spinel_transform_stack_push_unit_to_quad(struct spinel_transform_stack * ts, float const quad[8]) |
| { |
| float const x0 = X(quad, 0); |
| float const y0 = Y(quad, 0); |
| |
| float const x1 = X(quad, 1); |
| float const y1 = Y(quad, 1); |
| |
| float const x2 = X(quad, 2); |
| float const y2 = Y(quad, 2); |
| |
| float const x3 = X(quad, 3); |
| float const y3 = Y(quad, 3); |
| |
| float sx = x1 - x0; |
| float shy = y1 - y0; |
| |
| float const dx2 = x3 - x2; |
| float const dy2 = y3 - y2; |
| |
| float const dx3 = -sx - dx2; |
| float const dy3 = -shy - dy2; |
| |
| // if both zero then quad_dst is a parallelogram and affine |
| if ((dx3 == SPN_TRANSFORM_STACK_ZERO) && (dy3 == SPN_TRANSFORM_STACK_ZERO)) |
| { |
| float const shx = x2 - x1; |
| float const sy = y2 - y1; |
| |
| spinel_transform_stack_push_matrix_8(ts, sx, shx, x0, shy, sy, y0, 0.0, 0.0); |
| |
| return SPN_TRANSFORM_STACK_ENTRY_AFFINE; |
| } |
| else |
| { |
| float const dx1 = x1 - x2; |
| float const dy1 = y1 - y2; |
| |
| float const wx_den = dx1 * dy2 - dx2 * dy1; |
| |
| if (wx_den == SPN_TRANSFORM_STACK_ZERO) |
| return SPN_TRANSFORM_STACK_ENTRY_INVALID; |
| |
| float const w0_num = dx3 * dy2 - dx2 * dy3; |
| float const w1_num = dx1 * dy3 - dx3 * dy1; |
| |
| float const w0 = w0_num / wx_den; |
| float const w1 = w1_num / wx_den; |
| |
| sx += w0 * x1; |
| float const shx = x3 - x0 + w1 * x3; |
| |
| shy += w0 * y1; |
| float const sy = y3 - y0 + w1 * y3; |
| |
| spinel_transform_stack_push_matrix_8(ts, sx, shx, x0, shy, sy, y0, w0, w1); |
| |
| return SPN_TRANSFORM_STACK_ENTRY_PROJECTIVE; |
| } |
| } |
| |
| // |
| // |
| // |
| |
| spinel_transform_stack_entry_e |
| spinel_transform_stack_push_quad_to_unit(struct spinel_transform_stack * ts, float const quad[8]) |
| { |
| if (spinel_transform_stack_push_unit_to_quad(ts, quad) == SPN_TRANSFORM_STACK_ENTRY_INVALID) |
| return SPN_TRANSFORM_STACK_ENTRY_INVALID; |
| |
| return spinel_transform_stack_adjoint(ts); |
| } |
| |
| // |
| // |
| // |
| |
| spinel_transform_stack_entry_e |
| spinel_transform_stack_push_quad_to_quad(struct spinel_transform_stack * ts, |
| float const quad_src[8], |
| float const quad_dst[8]) |
| { |
| if (spinel_transform_stack_push_unit_to_quad(ts, quad_dst) == SPN_TRANSFORM_STACK_ENTRY_INVALID) |
| return SPN_TRANSFORM_STACK_ENTRY_INVALID; |
| |
| if (spinel_transform_stack_push_quad_to_unit(ts, quad_src) == SPN_TRANSFORM_STACK_ENTRY_INVALID) |
| return SPN_TRANSFORM_STACK_ENTRY_INVALID; |
| |
| spinel_transform_stack_multiply(ts); |
| |
| return spinel_transform_stack_classify(ts); |
| } |
| |
| // |
| // |
| // |
| |
| spinel_transform_stack_entry_e |
| spinel_transform_stack_push_rect_to_quad(struct spinel_transform_stack * ts, |
| float x0, |
| float y0, |
| float x1, |
| float y1, |
| float const quad_dst[8]) |
| { |
| if (spinel_transform_stack_push_unit_to_quad(ts, quad_dst) == SPN_TRANSFORM_STACK_ENTRY_INVALID) |
| return SPN_TRANSFORM_STACK_ENTRY_INVALID; |
| |
| spinel_transform_stack_push_matrix_8(ts, |
| SPN_TRANSFORM_STACK_RCP(x1 - x0), |
| 0.0, |
| -x0, |
| 0.0, |
| SPN_TRANSFORM_STACK_RCP(y1 - y0), |
| -y0, |
| 0.0, |
| 0.0); |
| |
| spinel_transform_stack_multiply(ts); |
| |
| return spinel_transform_stack_classify(ts); |
| } |
| |
| // |
| // The second matrix on the stack (TOS[-1]) is post-multiplied by the |
| // top matrix on the stack (TOS[0]). |
| // |
| // The result replaces TOS[0] and TOS[-1] is unmodified. |
| // |
| // The stack effect of concat is: |
| // |
| // | B | | A*B | |
| // | A | | A | |
| // | . | => | . | |
| // | . | | . | |
| // | . | | . | |
| // |
| void |
| spinel_transform_stack_concat(struct spinel_transform_stack * ts) |
| { |
| assert(ts->count >= 2); |
| |
| // get A and B |
| union spinel_transform_stack_3x3_u const * const B = spinel_transform_stack_tos(ts); |
| union spinel_transform_stack_3x3_u const * const A = B - 1; |
| |
| spinel_transform_stack_store_matrix(ts, ts->count - 1, SPN_TRANSFORM_STACK_MULTIPLY(A, B)); |
| } |
| |
| // |
| // The second matrix on the stack (TOS[-1]) is post-multiplied by the |
| // top matrix on the stack (TOS[0]). |
| // |
| // The result replaces both matrices. |
| // |
| // The stack effect of multiply is: |
| // |
| // | B | | A*B | |
| // | A | | . | |
| // | . | => | . | |
| // | . | | . | |
| // | . | | . | |
| // |
| void |
| spinel_transform_stack_multiply(struct spinel_transform_stack * ts) |
| { |
| assert(ts->count >= 2); |
| |
| // get A and B |
| union spinel_transform_stack_3x3_u const * const B = spinel_transform_stack_tos(ts); |
| union spinel_transform_stack_3x3_u const * const A = B - 1; |
| |
| spinel_transform_stack_store_matrix(ts, ts->count-- - 2, SPN_TRANSFORM_STACK_MULTIPLY(A, B)); |
| } |
| |
| // |
| // |
| // |
| |
| void |
| spinel_transform_stack_transform_xy( |
| struct spinel_transform_stack * ts, float x, float y, float * xp, float * yp) |
| { |
| union spinel_transform_stack_3x3_u const * const t = spinel_transform_stack_tos(ts); |
| |
| *xp = x * t->sx + y * t->shx + t->tx; |
| *yp = x * t->shy + y * t->sy + t->ty; |
| |
| if (!SPN_TRANSFORM_STACK_IS_AFFINE(t)) |
| { |
| float const d = SPN_TRANSFORM_STACK_RCP(x * t->w0 + y * t->w1 + SPN_TRANSFORM_STACK_ONE); |
| |
| *xp *= d; |
| *yp *= d; |
| } |
| } |
| |
| // |
| // test it! |
| // |
| |
| #ifdef SPN_TRANSFORM_STACK_DEBUG |
| |
| #include <stdio.h> |
| |
| #define SPN_TRANSFORM_STACK_SCALE 32.0 |
| |
| // |
| // |
| // |
| |
| void |
| spinel_transform_stack_tos_debug(struct spinel_transform_stack * ts) |
| { |
| union spinel_transform_stack_3x3_u const * const t = spinel_transform_stack_tos(ts); |
| |
| printf("{ { %13.5f, %13.5f, %13.5f },\n" |
| " { %13.5f, %13.5f, %13.5f },\n" |
| " { %13.5f, %13.5f, %13.5f } }\n", |
| t->a8[0], |
| t->a8[1], |
| t->a8[2], |
| t->a8[3], |
| t->a8[4], |
| t->a8[5], |
| t->a8[6], |
| t->a8[7], |
| SPN_TRANSFORM_STACK_ONE); |
| } |
| |
| // |
| // |
| // |
| |
| void |
| spinel_transform_stack_debug(struct spinel_transform_stack * ts, float const quad[8]) |
| { |
| spinel_transform_stack_tos_debug(ts); |
| |
| for (int ii = 0; ii < 8; ii += 2) |
| { |
| float xp, yp; |
| |
| spinel_transform_stack_transform_xy(ts, quad[ii], quad[ii + 1], &xp, &yp); |
| |
| printf("( %13.2f, %13.2f ) \t-> ( %13.2f, %13.2f )\n", |
| xp, |
| yp, |
| xp / SPN_TRANSFORM_STACK_SCALE, |
| yp / SPN_TRANSFORM_STACK_SCALE); |
| } |
| } |
| |
| // |
| // |
| // |
| |
| int |
| main(int argc, char * argv[]) |
| { |
| struct spinel_transform_stack * const ts = spinel_transform_stack_create(32); |
| |
| float const w = 1000; |
| float const h = 1000; |
| |
| #if 1 |
| spinel_transform_stack_push_scale(ts, SPN_TRANSFORM_STACK_SCALE, SPN_TRANSFORM_STACK_SCALE); |
| |
| // OpenGL'ism |
| spinel_transform_stack_push_affine(ts, 1.0f, 0.0f, 0.0f, 0.0f, -1.0f, h); |
| // multiply |
| spinel_transform_stack_concat(ts); |
| #else |
| spinel_transform_stack_push_identity(ts); |
| #endif |
| |
| uint32_t const restore = spinel_transform_stack_save(ts); |
| |
| // |
| // |
| // |
| float const quad_src[8] = { 0.0f, 0.0f, w, 0.0f, w, h, 0.0f, h }; |
| |
| float const quad_dst[8] = { 300.0f, 0.0f, w - 300.0f, 0.0f, w, h, 0.0f, h }; |
| |
| float const quad_tst[8] = { 50, 50, 1550, 50, 1550, 1550, 50, 1550 }; |
| // |
| // RECT TO QUAD |
| // |
| printf("type = %d\n", spinel_transform_stack_push_rect_to_quad(ts, 0.0, 0.0, w, h, quad_dst)); |
| spinel_transform_stack_concat(ts); |
| |
| spinel_transform_stack_debug(ts, quad_src); |
| |
| // |
| // QUAD TO QUAD |
| // |
| spinel_transform_stack_restore(ts, restore); |
| |
| printf("type = %d\n", spinel_transform_stack_push_quad_to_quad(ts, quad_src, quad_dst)); |
| spinel_transform_stack_concat(ts); |
| |
| spinel_transform_stack_debug(ts, quad_src); |
| |
| // |
| // DIRECT |
| // |
| spinel_transform_stack_restore(ts, restore); |
| |
| spinel_transform_stack_push_matrix(ts, |
| 0.87004626f, |
| -0.35519487f, |
| 72.14745f, |
| 0.0f, |
| 0.2600208f, |
| 86.16314f, |
| 0.0f, |
| -0.0029599573f, |
| 1.0f); |
| |
| spinel_transform_stack_concat(ts); |
| |
| float const quad_foo[8] = { -10, 10, 130, 10, 130, 110, -10, 110 }; |
| |
| spinel_transform_stack_debug(ts, quad_foo); |
| |
| return EXIT_SUCCESS; |
| } |
| |
| #endif |
| |
| // |
| // |
| // |
