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Update loading of gltf animation.

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This is to account for GLTF info being more like instructions on how to build your animation instead of verbose description of each pose.
This commit is contained in:
Hristo Stamenov 2021-02-01 14:14:56 +02:00
parent 2884b88101
commit 356a4f8a3b
2 changed files with 127 additions and 33 deletions
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13
examples/models/models_gltf_animation.c
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@ -50,10 +50,11 @@ int main(void)
int animsCount = 0; int animsCount = 0;
ModelAnimation *anims = LoadModelAnimations("resources/gltf/rigged_figure.glb", &animsCount); ModelAnimation *anims = LoadModelAnimations("resources/gltf/rigged_figure.glb", &animsCount);
int animFrameCounter = 0; int animFrameCounter = 0;
int animationDirection = 1;
SetCameraMode(camera, CAMERA_FREE); // Set free camera mode SetCameraMode(camera, CAMERA_FREE); // Set free camera mode
SetTargetFPS(60); // Set our game to run at 60 frames-per-second SetTargetFPS(30); // Set our game to run at 60 frames-per-second
//-------------------------------------------------------------------------------------- //--------------------------------------------------------------------------------------
// Main game loop // Main game loop
@ -66,9 +67,15 @@ int main(void)
// Play animation when spacebar is held down // Play animation when spacebar is held down
if (IsKeyDown(KEY_SPACE)) if (IsKeyDown(KEY_SPACE))
{ {
animFrameCounter++; animFrameCounter += animationDirection;
if (animFrameCounter >= anims[0].frameCount || animFrameCounter <= 0)
{
animationDirection *= -1;
animFrameCounter += animationDirection;
}
UpdateModelAnimation(model, anims[0], animFrameCounter); UpdateModelAnimation(model, anims[0], animFrameCounter);
if (animFrameCounter >= anims[0].frameCount) animFrameCounter = 0;
} }
//---------------------------------------------------------------------------------- //----------------------------------------------------------------------------------

145
src/models.c
View File

@ -3447,7 +3447,7 @@ static ModelAnimation* LoadIQMModelAnimations(const char* fileName, int* animCou
animations[a].boneCount = iqmHeader->num_poses; animations[a].boneCount = iqmHeader->num_poses;
animations[a].bones = RL_MALLOC(iqmHeader->num_poses*sizeof(BoneInfo)); animations[a].bones = RL_MALLOC(iqmHeader->num_poses*sizeof(BoneInfo));
animations[a].framePoses = RL_MALLOC(anim[a].num_frames*sizeof(Transform *)); animations[a].framePoses = RL_MALLOC(anim[a].num_frames*sizeof(Transform *));
//animations[a].framerate = anim.framerate; // TODO: Use framerate? // animations[a].framerate = anim.framerate; // TODO: Use framerate?
for (unsigned int j = 0; j < iqmHeader->num_poses; j++) for (unsigned int j = 0; j < iqmHeader->num_poses; j++)
{ {
@ -4050,6 +4050,26 @@ static Model LoadGLTF(const char *fileName)
return model; return model;
} }
static bool GltfReadFloat(cgltf_accessor* acc, unsigned int index, float* variable, unsigned int elements)
{
if(acc->count == 2)
{
if(index > 1)
{
return false;
}
memcpy(variable, index == 0 ? acc->min : acc->max, elements * sizeof(float));
return true;
}
else if (cgltf_accessor_read_float(acc, index, variable, elements))
{
return true;
}
return false;
}
// LoadGLTF loads in animation data from given filename // LoadGLTF loads in animation data from given filename
static ModelAnimation* LoadGLTFModelAnimations(const char *fileName, int *animCount) static ModelAnimation* LoadGLTFModelAnimations(const char *fileName, int *animCount)
{ {
@ -4086,26 +4106,55 @@ static ModelAnimation* LoadGLTFModelAnimations(const char *fileName, int *animCo
for (unsigned int a = 0; a < data->animations_count; a++) for (unsigned int a = 0; a < data->animations_count; a++)
{ {
// gltf animation consists of the following structures:
// - nodes - bones
// - channels - single transformation type on a single bone
// - node - bone
// - transformation type (path) - translation, rotation, scale
// - sampler - animation samples
// - input - points in time this transformation happens
// - output - the transformation amount at the given input points in time
// - interpolation - the type of interpolation to use between the frames
cgltf_animation *animation = data->animations + a; cgltf_animation *animation = data->animations + a;
ModelAnimation *output = animations + a; ModelAnimation *output = animations + a;
output->frameCount = animation->channels->sampler->input->count; // 30 frames sampled per second
const float TIMESTEP = (1.0f / 30.0f);
float animationDuration = 0.0f;
// Getting the max animation time to consider for animation duration
for (int i = 0; i < animation->channels_count; i++)
{
cgltf_animation_channel* channel = animation->channels + i;
int frameCounts = channel->sampler->input->count;
float lastFrameTime = 0.0f;
if(GltfReadFloat(channel->sampler->input, frameCounts - 1, &lastFrameTime, 1))
{
animationDuration = fmaxf(lastFrameTime, animationDuration);
}
}
output->frameCount = animationDuration / TIMESTEP;
output->boneCount = data->nodes_count; output->boneCount = data->nodes_count;
output->bones = RL_MALLOC(output->boneCount*sizeof(BoneInfo)); output->bones = RL_MALLOC(output->boneCount*sizeof(BoneInfo));
output->framePoses = RL_MALLOC(output->frameCount*sizeof(Transform *)); output->framePoses = RL_MALLOC(output->frameCount*sizeof(Transform *));
// output->framerate = // TODO: Use framerate instead of const timestep
// Name and parent bones
for (unsigned int j = 0; j < data->nodes_count; j++) for (unsigned int j = 0; j < data->nodes_count; j++)
{ {
strcpy(output->bones[j].name, data->nodes[j].name == 0 ? "ANIMJOINT" : data->nodes[j].name); strcpy(output->bones[j].name, data->nodes[j].name == 0 ? "ANIMJOINT" : data->nodes[j].name);
output->bones[j].parent = j != 0 ? (int)(data->nodes[j].parent - data->nodes) : 0; output->bones[j].parent = j != 0 ? (int)(data->nodes[j].parent - data->nodes) : 0;
} }
for (unsigned int j = 0; j < output->frameCount; j++) // Allocate data for frames
output->framePoses[j] = RL_MALLOC(output->frameCount*data->nodes_count*sizeof(Transform)); // Initiate with zero bone translations
for (unsigned int frame = 0; frame < output->frameCount; frame++) for (unsigned int frame = 0; frame < output->frameCount; frame++)
{ {
output->framePoses[frame] = RL_MALLOC(output->frameCount*data->nodes_count*sizeof(Transform));
for (unsigned int i = 0; i < data->nodes_count; i++) for (unsigned int i = 0; i < data->nodes_count; i++)
{ {
output->framePoses[frame][i].translation = Vector3Zero(); output->framePoses[frame][i].translation = Vector3Zero();
@ -4115,6 +4164,7 @@ static ModelAnimation* LoadGLTFModelAnimations(const char *fileName, int *animCo
} }
} }
// for each single transformation type on single bone
for(int channelId = 0; channelId < animation->channels_count; channelId++) for(int channelId = 0; channelId < animation->channels_count; channelId++)
{ {
cgltf_animation_channel* channel = animation->channels + channelId; cgltf_animation_channel* channel = animation->channels + channelId;
@ -4124,42 +4174,79 @@ static ModelAnimation* LoadGLTFModelAnimations(const char *fileName, int *animCo
for(int frame = 0; frame < output->frameCount; frame++) for(int frame = 0; frame < output->frameCount; frame++)
{ {
if(channel->target_path == cgltf_animation_path_type_translation) { bool shouldSkipFurtherTransformation = true;
Vector3 translation; int outputMin = 0;
if(cgltf_accessor_read_float(sampler->output, frame, (float*)&translation, 3)) int outputMax = 0;
float frameTime = frame * TIMESTEP;
float lerpPercent = 0.0f;
// For this transformation:
// getting between which input values the current frame time position
// and also what is the percent to use in the linear interpolation later
for(int j = 0; j < sampler->input->count; j++)
{
float inputFrameTime;
if(GltfReadFloat(sampler->input, j, (float*)&inputFrameTime, 1))
{ {
output->framePoses[frame][boneId].translation = translation; if(frameTime < inputFrameTime)
{
shouldSkipFurtherTransformation = false;
outputMin = j - 1;
outputMax = j;
float previousInputTime = 0.0f;
if(GltfReadFloat(sampler->input, j - 1, (float*)&previousInputTime, 1))
{
lerpPercent = (frameTime - previousInputTime) / (inputFrameTime - previousInputTime);
}
break;
}
} else {
break;
} }
else if (output->frameCount == 2) }
// If the current transformation has no information for the current frame time point
if(shouldSkipFurtherTransformation) {
continue;
}
if(channel->target_path == cgltf_animation_path_type_translation) {
Vector3 translationStart;
Vector3 translationEnd;
bool success = GltfReadFloat(sampler->output, outputMin, (float*)&translationStart, 3);
success = GltfReadFloat(sampler->output, outputMax, (float*)&translationEnd, 3) || success;
if(success)
{ {
memcpy(&translation, frame == 0 ? &(sampler->output->min) : &(sampler->output->max), 3 * sizeof(float)); output->framePoses[frame][boneId].translation = Vector3Lerp(translationStart, translationEnd, lerpPercent);
output->framePoses[frame][boneId].translation = translation;
} }
} }
if(channel->target_path == cgltf_animation_path_type_rotation) { if(channel->target_path == cgltf_animation_path_type_rotation) {
Quaternion rotation; Quaternion rotationStart;
if(cgltf_accessor_read_float(sampler->output, frame, (float*)&rotation, 4)) Quaternion rotationEnd;
bool success = GltfReadFloat(sampler->output, outputMin, (float*)&rotationStart, 4);
success = GltfReadFloat(sampler->output, outputMax, (float*)&rotationEnd, 4) || success;
if(success)
{ {
output->framePoses[frame][boneId].rotation = rotation; output->framePoses[frame][boneId].rotation = QuaternionLerp(rotationStart, rotationEnd, lerpPercent);
output->framePoses[frame][boneId].rotation = QuaternionNormalize(output->framePoses[frame][boneId].rotation);
}
else if (output->frameCount == 2)
{
memcpy(&rotation, frame == 0 ? &(sampler->output->min) : &(sampler->output->max), 4 * sizeof(float));
output->framePoses[frame][boneId].rotation = rotation;
output->framePoses[frame][boneId].rotation = QuaternionNormalize(output->framePoses[frame][boneId].rotation); output->framePoses[frame][boneId].rotation = QuaternionNormalize(output->framePoses[frame][boneId].rotation);
} }
} }
if(channel->target_path == cgltf_animation_path_type_scale) { if(channel->target_path == cgltf_animation_path_type_scale) {
Vector3 scale; Vector3 scaleStart;
if(cgltf_accessor_read_float(sampler->output, frame, (float*)&scale, 4)) Vector3 scaleEnd;
bool success = GltfReadFloat(sampler->output, outputMin, (float*)&scaleStart, 3);
success = GltfReadFloat(sampler->output, outputMax, (float*)&scaleEnd, 3) || success;
if(success)
{ {
output->framePoses[frame][boneId].scale = scale; output->framePoses[frame][boneId].scale = Vector3Lerp(scaleStart, scaleEnd, lerpPercent);
}
else if (output->frameCount == 2)
{
memcpy(&scale, frame == 0 ? &(sampler->output->min) : &(sampler->output->max), 3 * sizeof(float));
output->framePoses[frame][boneId].scale = scale;
} }
} }
} }