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Implement M2 texture animation (UV scrolling) for fountain water

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Parse M2TextureTransform entries and texture transform lookups from the
M2 binary, then apply per-batch UV offsets in the vertex shader using
the existing animation time base and global sequence durations.
This commit is contained in:
Kelsi 2026-02-06 01:49:27 -08:00
parent 4bb2828b21
commit ad04da31c3
4 changed files with 83 additions and 1 deletions
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31
src/rendering/m2_renderer.cpp
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@ -219,6 +219,7 @@ bool M2Renderer::initialize(pipeline::AssetManager* assets) {
uniform mat4 uProjection;
uniform bool uUseBones;
uniform mat4 uBones[128];
uniform vec2 uUVOffset;
out vec3 FragPos;
out vec3 Normal;
out vec2 TexCoord;
@ -240,7 +241,7 @@ bool M2Renderer::initialize(pipeline::AssetManager* assets) {
vec4 worldPos = uModel * vec4(pos, 1.0);
FragPos = worldPos.xyz;
Normal = mat3(uModel) * norm;
TexCoord = aTexCoord;
TexCoord = aTexCoord + uUVOffset;
gl_Position = uProjection * uView * worldPos;
}
@ -710,6 +711,11 @@ bool M2Renderer::loadModel(const pipeline::M2Model& model, uint32_t modelId) {
}
}
// Copy texture transform data for UV animation
gpuModel.textureTransforms = model.textureTransforms;
gpuModel.textureTransformLookup = model.textureTransformLookup;
gpuModel.hasTextureAnimation = false;
// Build per-batch GPU entries
if (!model.batches.empty()) {
for (const auto& batch : model.batches) {
@ -717,6 +723,12 @@ bool M2Renderer::loadModel(const pipeline::M2Model& model, uint32_t modelId) {
bgpu.indexStart = batch.indexStart;
bgpu.indexCount = batch.indexCount;
// Store texture animation index from batch
bgpu.textureAnimIndex = batch.textureAnimIndex;
if (bgpu.textureAnimIndex != 0xFFFF) {
gpuModel.hasTextureAnimation = true;
}
// Resolve texture: batch.textureIndex → textureLookup → allTextures
GLuint tex = whiteTexture;
if (batch.textureIndex < model.textureLookup.size()) {
@ -1224,6 +1236,23 @@ void M2Renderer::render(const Camera& camera, const glm::mat4& view, const glm::
for (const auto& batch : model.batches) {
if (batch.indexCount == 0) continue;
// Compute UV offset for texture animation
glm::vec2 uvOffset(0.0f, 0.0f);
if (batch.textureAnimIndex != 0xFFFF && model.hasTextureAnimation) {
uint16_t lookupIdx = batch.textureAnimIndex;
if (lookupIdx < model.textureTransformLookup.size()) {
uint16_t transformIdx = model.textureTransformLookup[lookupIdx];
if (transformIdx < model.textureTransforms.size()) {
const auto& tt = model.textureTransforms[transformIdx];
glm::vec3 trans = interpVec3(tt.translation,
instance.currentSequenceIndex, instance.animTime,
glm::vec3(0.0f), model.globalSequenceDurations);
uvOffset = glm::vec2(trans.x, trans.y);
}
}
}
shader->setUniform("uUVOffset", uvOffset);
bool hasTexture = (batch.texture != 0);
shader->setUniform("uHasTexture", hasTexture);
shader->setUniform("uAlphaTest", batch.hasAlpha);