63 lines
1.7 KiB
C
63 lines
1.7 KiB
C
#include "animation.h"
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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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static mat4_t bone_transform(bone_t bone)
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{
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return mat4_mul(
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mat4_translate_vec3(bone.translation),
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mat4_rotate_quaternion(bone.rotation));
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}
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static void compute_bone_matrices(
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const bone_t *bones, size_t bone_count, const uint32_t *bone_parents,
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const mat4_t *inverse_bind_matrices, mat4_t *matrices)
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{
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matrices[0] = bone_transform(bones[0]);
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for (unsigned i = 1; i < bone_count; ++i) {
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const mat4_t transform = bone_transform(bones[i]);
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const uint32_t parent = bone_parents[i];
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assert(parent < bone_count);
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matrices[i] = mat4_mul(matrices[parent], transform);
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}
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for (unsigned i = 0; i < bone_count; ++i)
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matrices[i] = mat4_mul(matrices[i], inverse_bind_matrices[i]);
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}
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animation_state_t animation_init(const model_t *model)
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{
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mat4_t *bone_matrices = malloc(model->bone_count * sizeof(mat4_t));
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assert(bone_matrices != nullptr);
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return (animation_state_t) { .bone_matrices = bone_matrices };
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}
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void animation_cleanup(animation_state_t *state)
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{
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if (state->bone_matrices != nullptr) {
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free(state->bone_matrices);
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state->bone_matrices = nullptr;
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}
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}
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void animation_start(animation_state_t *state, const model_t *model)
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{
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state->current = model->bones;
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}
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void animation_update(animation_state_t *state, const model_t *model)
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{
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const size_t offset = state->keyframe * model->bone_count;
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state->current = model->animation.keyframes + offset;
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compute_bone_matrices(
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state->current, model->bone_count, model->bone_parents,
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model->inverse_bind_matrices, state->bone_matrices);
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++state->keyframe;
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if (state->keyframe >= model->animation.keyframe_count)
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state->keyframe = 0;
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}
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