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[Renderers/Raylib] Precomputing once per frame #127

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[Renderers/Raylib] Precomputing once per frame #127

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275c9d9
precompute once per frame
abdiths Dec 29, 2024
4f50603
updated render
abdiths Dec 29, 2024
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50 changes: 28 additions & 22 deletions renderers/raylib/clay_renderer_raylib.c
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Original file line number Diff line number Diff line change
Expand Up @@ -38,8 +38,28 @@ typedef struct
};
} CustomLayoutElement;

// Precompute the matrices at start of the frame
Matrix PrecomputeViewMatrix(const Camera camera){
return MatrixLookAt(camera.position, camera.target, camera.up);
}

Matrix PrecomputeProjectionMatrix(const Camera camera, int screenWidth, int screenHeight, float zDistance) {
Matrix matProj = MatrixIdentity();
if (camera.projection == CAMERA_PERSPECTIVE) {
// Calculate projection matrix from perspective
matProj = MatrixPerspective(camera.fovy * DEG2RAD, ((double)screenWidth / (double)screenHeight), 0.01f, zDistance);
} else if (camera.projection == CAMERA_ORTHOGRAPHIC) {
double aspect = (double)screenWidth / (double)screenHeight;
double top = camera.fovy / 2.0;
double right = top * aspect;
// Calculate projection matrix from orthographic
matProj = MatrixOrtho(-right, right, -top, top, 0.01, 1000.0);
}
return matProj;
}

// Get a ray trace from the screen position (i.e mouse) within a specific section of the screen
Ray GetScreenToWorldPointWithZDistance(Vector2 position, Camera camera, int screenWidth, int screenHeight, float zDistance)
Ray GetScreenToWorldPointWithZDistance(Vector2 position, const Matrix matView, const Matrix matProj, int screenWidth, int screenHeight) {
{
Ray ray = { 0 };

Expand All @@ -52,26 +72,6 @@ Ray GetScreenToWorldPointWithZDistance(Vector2 position, Camera camera, int scre
// Store values in a vector
Vector3 deviceCoords = { x, y, z };

// Calculate view matrix from camera look at
Matrix matView = MatrixLookAt(camera.position, camera.target, camera.up);

Matrix matProj = MatrixIdentity();

if (camera.projection == CAMERA_PERSPECTIVE)
{
// Calculate projection matrix from perspective
matProj = MatrixPerspective(camera.fovy*DEG2RAD, ((double)screenWidth/(double)screenHeight), 0.01f, zDistance);
}
else if (camera.projection == CAMERA_ORTHOGRAPHIC)
{
double aspect = (double)screenWidth/(double)screenHeight;
double top = camera.fovy/2.0;
double right = top*aspect;

// Calculate projection matrix from orthographic
matProj = MatrixOrtho(-right, right, -top, top, 0.01, 1000.0);
}

// Unproject far/near points
Vector3 nearPoint = Vector3Unproject((Vector3){ deviceCoords.x, deviceCoords.y, 0.0f }, matProj, matView);
Vector3 farPoint = Vector3Unproject((Vector3){ deviceCoords.x, deviceCoords.y, 1.0f }, matProj, matView);
Expand Down Expand Up @@ -129,6 +129,12 @@ void Clay_Raylib_Initialize(int width, int height, const char *title, unsigned i

void Clay_Raylib_Render(Clay_RenderCommandArray renderCommands)
{

int screenWidth = GetScreenWidth();
int screenHeight = GetScreenHeight();
Matrix matView = PrecomputeViewMatrix(Raylib_camera);
Matrix matProj = PrecomputeProjectionMatrix(Raylib_camera, screenWidth, screenHeight, 140.0f);

measureCalls = 0;
for (int j = 0; j < renderCommands.length; j++)
{
Expand Down Expand Up @@ -230,4 +236,4 @@ void Clay_Raylib_Render(Clay_RenderCommandArray renderCommands)
}
}
}
}
}