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feat: base-color texture support for DAE meshes #111

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1f14c13
feat: add base-color texture support for DAE meshes
vklemm Mar 28, 2026
f39232a
fix: flip V texture coordinate for correct UV mapping
vklemm Mar 30, 2026
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Binary file added assets/meshes/checkerboard.png
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118 changes: 118 additions & 0 deletions assets/meshes/textured_quad.dae
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Original file line number Diff line number Diff line change
@@ -0,0 +1,118 @@
<?xml version="1.0" encoding="utf-8"?>
<COLLADA xmlns="http://www.collada.org/2005/11/COLLADASchema" version="1.4.1">
<asset>
<up_axis>Z_UP</up_axis>
</asset>

<library_images>
<image id="checkerboard-img" name="checkerboard">
<init_from>checkerboard.png</init_from>
</image>
</library_images>

<library_effects>
<effect id="checkerboard-effect">
<profile_COMMON>
<newparam sid="checkerboard-surface">
<surface type="2D">
<init_from>checkerboard-img</init_from>
</surface>
</newparam>
<newparam sid="checkerboard-sampler">
<sampler2D>
<source>checkerboard-surface</source>
</sampler2D>
</newparam>
<technique sid="common">
<phong>
<diffuse>
<texture texture="checkerboard-sampler" texcoord="UVMap"/>
</diffuse>
</phong>
</technique>
</profile_COMMON>
</effect>
</library_effects>

<library_materials>
<material id="checkerboard-mat" name="Checkerboard">
<instance_effect url="#checkerboard-effect"/>
</material>
</library_materials>

<library_geometries>
<geometry id="quad-mesh" name="Quad">
<mesh>
<!-- 4 vertices: unit quad in XY plane -->
<source id="quad-positions">
<float_array id="quad-positions-array" count="12">
-1 -1 0 1 -1 0 1 1 0 -1 1 0
</float_array>
<technique_common>
<accessor source="#quad-positions-array" count="4" stride="3">
<param name="X" type="float"/>
<param name="Y" type="float"/>
<param name="Z" type="float"/>
</accessor>
</technique_common>
</source>

<source id="quad-normals">
<float_array id="quad-normals-array" count="3">0 0 1</float_array>
<technique_common>
<accessor source="#quad-normals-array" count="1" stride="3">
<param name="X" type="float"/>
<param name="Y" type="float"/>
<param name="Z" type="float"/>
</accessor>
</technique_common>
</source>

<!-- UVs: (0,0) bottom-left to (1,1) top-right (OpenGL convention) -->
<source id="quad-uvs">
<float_array id="quad-uvs-array" count="8">
0 0 1 0 1 1 0 1
</float_array>
<technique_common>
<accessor source="#quad-uvs-array" count="4" stride="2">
<param name="S" type="float"/>
<param name="T" type="float"/>
</accessor>
</technique_common>
</source>

<vertices id="quad-vertices">
<input semantic="POSITION" source="#quad-positions"/>
</vertices>

<!-- Two triangles forming the quad -->
<triangles material="checkerboard-mat" count="2">
<input semantic="VERTEX" source="#quad-vertices" offset="0"/>
<input semantic="NORMAL" source="#quad-normals" offset="1"/>
<input semantic="TEXCOORD" source="#quad-uvs" offset="2" set="0"/>
<p>0 0 0 1 0 1 2 0 2 0 0 0 2 0 2 3 0 3</p>
</triangles>
</mesh>
</geometry>
</library_geometries>

<library_visual_scenes>
<visual_scene id="Scene" name="Scene">
<node id="Quad" name="Quad" type="NODE">
<instance_geometry url="#quad-mesh">
<bind_material>
<technique_common>
<instance_material symbol="checkerboard-mat" target="#checkerboard-mat">
<bind_vertex_input semantic="UVMap" input_semantic="TEXCOORD" input_set="0"/>
</instance_material>
</technique_common>
</bind_material>
</instance_geometry>
</node>
</visual_scene>
</library_visual_scenes>

<scene>
<instance_visual_scene url="#Scene"/>
</scene>
</COLLADA>
1 change: 1 addition & 0 deletions examples/cpp/CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -39,6 +39,7 @@ add_candlewick_example(Triangle.cpp)
add_candlewick_example(ColoredCube.cpp)
add_candlewick_example(MeshNormalsRgb.cpp)
add_candlewick_example(LitMesh.cpp)
add_candlewick_example(TexturedMesh.cpp)
if(BUILD_PINOCCHIO_VISUALIZER)
add_candlewick_example(
Ur5WithSystems.cpp
Expand Down
17 changes: 17 additions & 0 deletions examples/cpp/LitMesh.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,7 @@
#include "candlewick/core/Shader.h"
#include "candlewick/utils/MeshData.h"
#include "candlewick/utils/LoadMesh.h"
#include "candlewick/utils/LoadTexture.h"
#include "candlewick/core/CameraControls.h"
#include "candlewick/core/LightUniforms.h"
#include "candlewick/core/TransformUniforms.h"
Expand Down Expand Up @@ -141,6 +142,13 @@ int main() {
.intensity = 4.0,
};

// Load base color texture (fallback to white for untextured meshes)
Texture baseColorTex = meshDatas[0].baseColorTexturePath.empty()
? createWhiteTexture(device)
: loadTextureFromFile(
device, meshDatas[0].baseColorTexturePath.c_str());
SDL_GPUSampler *materialSampler = createMaterialSampler(device);

while (frameNo < 1000 && !quitRequested) {
SDL_Event event;
while (SDL_PollEvent(&event)) {
Expand Down Expand Up @@ -229,6 +237,13 @@ int main() {
.pushFragmentUniform(0u, materialUbo)
.pushFragmentUniform(1u, lightUbo);

// Bind base color texture
rend::bindFragmentSamplers(render_pass, 2u,
{{
.texture = baseColorTex,
.sampler = materialSampler,
}});

rend::draw(render_pass, meshes[0]);

SDL_EndGPURenderPass(render_pass);
Expand All @@ -242,6 +257,8 @@ int main() {
for (auto &mesh : meshes) {
mesh.release();
}
baseColorTex.destroy();
SDL_ReleaseGPUSampler(device, materialSampler);
pipeline.release();
ctx.destroy();
SDL_Quit();
Expand Down
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