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[rmodels] Re-implement DrawBillboardPro

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coco24 2024-07-07 15:57:16 +08:00
parent 9a280cda0b
commit 91e19d4c42
1 changed files with 45 additions and 87 deletions
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132
src/rmodels.c
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@ -3659,108 +3659,66 @@ void DrawBillboardRec(Camera camera, Texture2D texture, Rectangle source, Vector
void DrawBillboardPro(Camera camera, Texture2D texture, Rectangle source, Vector3 position, Vector3 up, Vector2 size, Vector2 origin, float rotation, Color tint) void DrawBillboardPro(Camera camera, Texture2D texture, Rectangle source, Vector3 position, Vector3 up, Vector2 size, Vector2 origin, float rotation, Color tint)
{ {
// NOTE: Billboard size will maintain source rectangle aspect ratio, size will represent billboard width // NOTE: Billboard size will maintain source rectangle aspect ratio, size will represent billboard width
Vector2 sizeRatio = { size.x*fabsf((float)source.width/source.height), size.y }; size = (Vector2) { size.x*fabsf((float)source.width/source.height), size.y };
Matrix matView = MatrixLookAt(camera.position, camera.target, camera.up); Matrix matView = MatrixLookAt(camera.position, camera.target, camera.up);
Vector3 right = { matView.m0, matView.m4, matView.m8 }; Vector3 right = { matView.m0, matView.m4, matView.m8 };
//Vector3 up = { matView.m1, matView.m5, matView.m9 }; right = Vector3Scale(right, size.x);
up = Vector3Scale(up, size.y);
Vector3 rightScaled = Vector3Scale(right, sizeRatio.x/2); if (size.x < 0.0f)
Vector3 upScaled = Vector3Scale(up, sizeRatio.y/2);
Vector3 p1 = Vector3Add(rightScaled, upScaled);
Vector3 p2 = Vector3Subtract(rightScaled, upScaled);
Vector3 topLeft = Vector3Scale(p2, -1);
Vector3 topRight = p1;
Vector3 bottomRight = p2;
Vector3 bottomLeft = Vector3Scale(p1, -1);
if (rotation != 0.0f)
{ {
float sinRotation = sinf(rotation*DEG2RAD); source.x += size.x;
float cosRotation = cosf(rotation*DEG2RAD); source.width *= -1.0;
right = Vector3Negate(right);
// NOTE: (-1, 1) is the range where origin.x, origin.y is inside the texture origin.x *= -1.0f;
float rotateAboutX = sizeRatio.x*origin.x/2; }
float rotateAboutY = sizeRatio.y*origin.y/2; if (size.y < 0.0f)
{
float xtvalue, ytvalue; source.y += size.y;
float rotatedX, rotatedY; source.height *= -1.0;
up = Vector3Negate(up);
xtvalue = Vector3DotProduct(right, topLeft) - rotateAboutX; // Project points to x and y coordinates on the billboard plane origin.y *= -1.0f;
ytvalue = Vector3DotProduct(up, topLeft) - rotateAboutY;
rotatedX = xtvalue*cosRotation - ytvalue*sinRotation + rotateAboutX; // Rotate about the point origin
rotatedY = xtvalue*sinRotation + ytvalue*cosRotation + rotateAboutY;
topLeft = Vector3Add(Vector3Scale(up, rotatedY), Vector3Scale(right, rotatedX)); // Translate back to cartesian coordinates
xtvalue = Vector3DotProduct(right, topRight) - rotateAboutX;
ytvalue = Vector3DotProduct(up, topRight) - rotateAboutY;
rotatedX = xtvalue*cosRotation - ytvalue*sinRotation + rotateAboutX;
rotatedY = xtvalue*sinRotation + ytvalue*cosRotation + rotateAboutY;
topRight = Vector3Add(Vector3Scale(up, rotatedY), Vector3Scale(right, rotatedX));
xtvalue = Vector3DotProduct(right, bottomRight) - rotateAboutX;
ytvalue = Vector3DotProduct(up, bottomRight) - rotateAboutY;
rotatedX = xtvalue*cosRotation - ytvalue*sinRotation + rotateAboutX;
rotatedY = xtvalue*sinRotation + ytvalue*cosRotation + rotateAboutY;
bottomRight = Vector3Add(Vector3Scale(up, rotatedY), Vector3Scale(right, rotatedX));
xtvalue = Vector3DotProduct(right, bottomLeft)-rotateAboutX;
ytvalue = Vector3DotProduct(up, bottomLeft)-rotateAboutY;
rotatedX = xtvalue*cosRotation - ytvalue*sinRotation + rotateAboutX;
rotatedY = xtvalue*sinRotation + ytvalue*cosRotation + rotateAboutY;
bottomLeft = Vector3Add(Vector3Scale(up, rotatedY), Vector3Scale(right, rotatedX));
} }
// Translate points to the draw center (position) position = Vector3Add(position, Vector3Scale(Vector3Add(Vector3Scale(right, origin.x), Vector3Scale(up, origin.y)), 0.5f));
topLeft = Vector3Add(topLeft, position); origin = Vector2Multiply(Vector2Scale(Vector2Add(origin, Vector2One()), 0.5f), (Vector2) { fabsf(size.x), fabsf(size.y) });
topRight = Vector3Add(topRight, position);
bottomRight = Vector3Add(bottomRight, position); Vector3 forward;
bottomLeft = Vector3Add(bottomLeft, position); if (rotation != 0.0) forward = Vector3CrossProduct(right, up);
Vector3 origin3D = Vector3Add(Vector3Scale(Vector3Normalize(right), origin.x), Vector3Scale(Vector3Normalize(up), origin.y));
Vector3 points[4];
points[0] = Vector3Zero();
points[1] = right;
points[2] = Vector3Add(up, right);
points[3] = up;
for (int i = 0; i < 4; i++)
{
points[i] = Vector3Subtract(points[i], origin3D);
if (rotation != 0.0) points[i] = Vector3RotateByAxisAngle(points[i], forward, rotation * DEG2RAD);
points[i] = Vector3Add(points[i], position);
}
Vector2 texcoords[4];
texcoords[0] = (Vector2) { (float)source.x/texture.width, (float)(source.y + source.height)/texture.height };
texcoords[1] = (Vector2) { (float)(source.x + source.width)/texture.width, (float)(source.y + source.height)/texture.height };
texcoords[2] = (Vector2) { (float)(source.x + source.width)/texture.width, (float)source.y/texture.height };
texcoords[3] = (Vector2) { (float)source.x/texture.width, (float)source.y/texture.height };
rlSetTexture(texture.id); rlSetTexture(texture.id);
rlBegin(RL_QUADS); rlBegin(RL_QUADS);
rlColor4ub(tint.r, tint.g, tint.b, tint.a); rlColor4ub(tint.r, tint.g, tint.b, tint.a);
for (int i = 0; i < 4; i++)
if (sizeRatio.x*sizeRatio.y >= 0.0f)
{ {
// Bottom-left corner for texture and quad rlTexCoord2f(texcoords[i].x, texcoords[i].y);
rlTexCoord2f((float)source.x/texture.width, (float)source.y/texture.height); rlVertex3f(points[i].x, points[i].y, points[i].z);
rlVertex3f(topLeft.x, topLeft.y, topLeft.z);
// Top-left corner for texture and quad
rlTexCoord2f((float)source.x/texture.width, (float)(source.y + source.height)/texture.height);
rlVertex3f(bottomLeft.x, bottomLeft.y, bottomLeft.z);
// Top-right corner for texture and quad
rlTexCoord2f((float)(source.x + source.width)/texture.width, (float)(source.y + source.height)/texture.height);
rlVertex3f(bottomRight.x, bottomRight.y, bottomRight.z);
// Bottom-right corner for texture and quad
rlTexCoord2f((float)(source.x + source.width)/texture.width, (float)source.y/texture.height);
rlVertex3f(topRight.x, topRight.y, topRight.z);
}
else
{
// Reverse vertex order if the size has only one negative dimension
rlTexCoord2f((float)(source.x + source.width)/texture.width, (float)source.y/texture.height);
rlVertex3f(topRight.x, topRight.y, topRight.z);
rlTexCoord2f((float)(source.x + source.width)/texture.width, (float)(source.y + source.height)/texture.height);
rlVertex3f(bottomRight.x, bottomRight.y, bottomRight.z);
rlTexCoord2f((float)source.x/texture.width, (float)(source.y + source.height)/texture.height);
rlVertex3f(bottomLeft.x, bottomLeft.y, bottomLeft.z);
rlTexCoord2f((float)source.x/texture.width, (float)source.y/texture.height);
rlVertex3f(topLeft.x, topLeft.y, topLeft.z);
} }
rlEnd(); rlEnd();
rlSetTexture(0); rlSetTexture(0);
} }