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[rmodels] Optional GPU skinning (#4321)

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* Added optional GPU skinning

* Added skinned bone matrices support for different file formats.

* Moved new shader locations to end of enum to avoid breaking existing examples. Added gpu skinning on drawing of instanced meshes.

* Added GPU skinning example.

* Removed variable declaration to avoid shadowing warning.
This commit is contained in:
Daniel Holden 2024-09-20 11:30:37 -04:00 • committed by GitHub
parent 2f0cf8fbe1
commit 86ead96263
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11 changed files with 437 additions and 23 deletions
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17
examples/models/resources/shaders/glsl100/skinning.fs Normal file
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#version 100
// Input vertex attributes (from vertex shader)
in vec2 fragTexCoord;
in vec4 fragColor;
// Output fragment color
out vec4 finalColor;
uniform sampler2D texture0;
uniform vec4 colDiffuse;
void main()
{
vec4 texelColor = texture(texture0, fragTexCoord);
finalColor = texelColor*colDiffuse*fragColor;
}

34
examples/models/resources/shaders/glsl100/skinning.vs Normal file
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#version 100
in vec3 vertexPosition;
in vec2 vertexTexCoord;
in vec4 vertexColor;
in vec4 vertexBoneIds;
in vec4 vertexBoneWeights;
#define MAX_BONE_NUM 128
uniform mat4 boneMatrices[MAX_BONE_NUM];
uniform mat4 mvp;
out vec2 fragTexCoord;
out vec4 fragColor;
void main()
{
int boneIndex0 = int(vertexBoneIds.x);
int boneIndex1 = int(vertexBoneIds.y);
int boneIndex2 = int(vertexBoneIds.z);
int boneIndex3 = int(vertexBoneIds.w);
vec4 skinnedPosition =
vertexBoneWeights.x * (boneMatrices[boneIndex0] * vec4(vertexPosition, 1.0f)) +
vertexBoneWeights.y * (boneMatrices[boneIndex1] * vec4(vertexPosition, 1.0f)) +
vertexBoneWeights.z * (boneMatrices[boneIndex2] * vec4(vertexPosition, 1.0f)) +
vertexBoneWeights.w * (boneMatrices[boneIndex3] * vec4(vertexPosition, 1.0f));
fragTexCoord = vertexTexCoord;
fragColor = vertexColor;
gl_Position = mvp * skinnedPosition;
}

17
examples/models/resources/shaders/glsl330/skinning.fs Normal file
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#version 330
// Input vertex attributes (from vertex shader)
in vec2 fragTexCoord;
in vec4 fragColor;
// Output fragment color
out vec4 finalColor;
uniform sampler2D texture0;
uniform vec4 colDiffuse;
void main()
{
vec4 texelColor = texture(texture0, fragTexCoord);
finalColor = texelColor*colDiffuse*fragColor;
}

34
examples/models/resources/shaders/glsl330/skinning.vs Normal file
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#version 330
in vec3 vertexPosition;
in vec2 vertexTexCoord;
in vec4 vertexColor;
in vec4 vertexBoneIds;
in vec4 vertexBoneWeights;
#define MAX_BONE_NUM 128
uniform mat4 boneMatrices[MAX_BONE_NUM];
uniform mat4 mvp;
out vec2 fragTexCoord;
out vec4 fragColor;
void main()
{
int boneIndex0 = int(vertexBoneIds.x);
int boneIndex1 = int(vertexBoneIds.y);
int boneIndex2 = int(vertexBoneIds.z);
int boneIndex3 = int(vertexBoneIds.w);
vec4 skinnedPosition =
vertexBoneWeights.x * (boneMatrices[boneIndex0] * vec4(vertexPosition, 1.0f)) +
vertexBoneWeights.y * (boneMatrices[boneIndex1] * vec4(vertexPosition, 1.0f)) +
vertexBoneWeights.z * (boneMatrices[boneIndex2] * vec4(vertexPosition, 1.0f)) +
vertexBoneWeights.w * (boneMatrices[boneIndex3] * vec4(vertexPosition, 1.0f));
fragTexCoord = vertexTexCoord;
fragColor = vertexColor;
gl_Position = mvp * skinnedPosition;
}